<html><head></head><body><div class="ydpf99e96edyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div></div>
<div dir="ltr" data-setdir="false">Hugh, how big are the files? Can you email them to me?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">From what I've seen and heard with others experience, I feel 50ah per trolling motor is plenty. I'm using 36v 101# minnkota's and would like to use a 36v 100ah battery that could power two motors. Length is not an issue but the diameter of the pods limits the width cross-section. I'll have to measure again to get the exact size but it's about 8.75 inches.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Rebel sells a 36v-100ah LiFePO4 for $1595 (US) but won't fit in my battery pods. I might be able to get it to fit inside the sub though.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jon</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
</div><div id="ydp2f23f18fyahoo_quoted_4724961666" class="ydp2f23f18fyahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Monday, June 6, 2022, 06:18:07 PM EDT, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div dir="ltr">Hi Jon, Hank, et co.<br></div><div dir="ltr"><br></div><div dir="ltr">I have been repackaging LiFePO4 for 10 years now since I started.<br></div><div dir="ltr">This is the main thing that has kept me from getting my sub in the water.<br></div><div dir="ltr"><br></div><div dir="ltr">First thing you need to decide on is the Life PO4 type. Either cylindrical<br></div><div dir="ltr">or Prismatic. Cylindrical batteries have better performance. I am using 15<br></div><div dir="ltr">Ah cells (headway 40152S 15Ah )which have a 10C discharge i.e. 150 amps. We<br></div><div dir="ltr">have made a test circuit where we discharge them at 150 amps and see what<br></div><div dir="ltr">the current drops to in each cell. I have 560 cells. The problem with them<br></div><div dir="ltr">is that you need multiple CMU (cell management Units) to balance them and<br></div><div dir="ltr">then report via CAN to the BMS. These cells are 40mm diam x mounted in<br></div><div dir="ltr">hexagonal plastic interlocking mounts and you can build different shapes. I<br></div><div dir="ltr">have a number of different strings of 8 cells (24v) in parallel and series.<br></div><div dir="ltr">The idea of these is to have an air space around each cell and to provide<br></div><div dir="ltr">good cooling.<br></div><div dir="ltr"><br></div><div dir="ltr">Due to the pain in my butt from having all these CMU's to deal with I am now<br></div><div dir="ltr">changing over to Prismatic which are rectangular. The ones I am using are<br></div><div dir="ltr">120Ah and I am able to get 1.5 times the total energy for the sub. i.e.<br></div><div dir="ltr">32kwh instead of 22 kwh. Now I am able to use far fewer CMU's and simplify<br></div><div dir="ltr">the system and packaging but only able to get 2C discharge (240 amps per<br></div><div dir="ltr">cell). These cells are a lot cheaper and easier to manage and<br></div><div dir="ltr">package/service etc..<br></div><div dir="ltr"><br></div><div dir="ltr">The problem with sub batteries is the length of time between uses and<br></div><div dir="ltr">keeping the system charged.<br></div><div dir="ltr"><br></div><div dir="ltr">This is a lengthy subject and I have a fair bit of experience in problems<br></div><div dir="ltr">that I have had. <br></div><div dir="ltr">I suggest you put together the wish list you have and the operating voltage<br></div><div dir="ltr">and total amphours you are wanting to achieve.<br></div><div dir="ltr"><br></div><div dir="ltr">I would not recommend removing the BMS and CMU's from the packs.<br></div><div dir="ltr"><br></div><div dir="ltr">Jon if you can tell me where I can drop a bunch of documents I am sure I can<br></div><div dir="ltr">assist with my experience in these. I have had some cells let go and others<br></div><div dir="ltr">punctured. Both types.<br></div><div dir="ltr"><br></div><div dir="ltr">I am also importing electric vehicles with lead acid and going to convert to<br></div><div dir="ltr">LiFePo4.<br></div><div dir="ltr"><br></div><div dir="ltr">Cheers to all,<br></div><div dir="ltr">Hugh<br></div><div dir="ltr"><br></div><div dir="ltr">-----Original Message-----<br></div><div dir="ltr">From: Personal_Submersibles <<a href="mailto:personal_submersibles-bounces@psubs.org" rel="nofollow" target="_blank">personal_submersibles-bounces@psubs.org</a>> On<br></div><div dir="ltr">Behalf Of via Personal_Submersibles<br></div><div dir="ltr">Sent: Tuesday, 7 June 2022 7:50 AM<br></div><div dir="ltr">To: <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a><br></div><div dir="ltr">Subject: Personal_Submersibles Digest, Vol 107, Issue 2<br></div><div dir="ltr"><br></div><div dir="ltr">Send Personal_Submersibles mailing list submissions to<br></div><div dir="ltr"> <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">To subscribe or unsubscribe via the World Wide Web, visit<br></div><div dir="ltr"> <a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">or, via email, send a message with subject or body 'help' to<br></div><div dir="ltr"> <a href="mailto:personal_submersibles-request@psubs.org" rel="nofollow" target="_blank">personal_submersibles-request@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">You can reach the person managing the list at<br></div><div dir="ltr"> <a href="mailto:personal_submersibles-owner@psubs.org" rel="nofollow" target="_blank">personal_submersibles-owner@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">When replying, please edit your Subject line so it is more specific than<br></div><div dir="ltr">"Re: Contents of Personal_Submersibles digest..."<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Today's Topics:<br></div><div dir="ltr"><br></div><div dir="ltr"> 1. Re: Repackaged LifePo4? (Jon Wallace via Personal_Submersibles)<br></div><div dir="ltr"> 2. Re: Repackaged LifePo4? (hank pronk via Personal_Submersibles)<br></div><div dir="ltr"> 3. Re: Repackaged LifePo4? (David Colombo via Personal_Submersibles)<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">----------------------------------------------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 1<br></div><div dir="ltr">Date: Mon, 6 Jun 2022 11:27:39 +0000 (UTC)<br></div><div dir="ltr">From: Jon Wallace via Personal_Submersibles<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">To: Personal Submersibles General Discussion<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Subject: Re: [PSUBS-MAILIST] Repackaged LifePo4?<br></div><div dir="ltr">Message-ID: <<a href="mailto:1768746693.7700625.1654514859732@mail.yahoo.com" rel="nofollow" target="_blank">1768746693.7700625.1654514859732@mail.yahoo.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr"> I agree, buoyancy is a factor but can be addressed by filling the battery<br></div><div dir="ltr">pods with lead or concrete weight in replacement of the original battery<br></div><div dir="ltr">weight.? I believe I can literally power the entire submarine with just two<br></div><div dir="ltr">LiFePo4 batteries if I wanted to.? That's attractive to me in terms of<br></div><div dir="ltr">maintenance.<br></div><div dir="ltr">Jon<br></div><div dir="ltr"><br></div><div dir="ltr"> On Monday, June 6, 2022, 07:06:11 AM EDT, Rick Patton via<br></div><div dir="ltr">Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote: <br></div><div dir="ltr"> <br></div><div dir="ltr"> The one thing that comes to mind Jon is that the Ksubs buoyancy is designed<br></div><div dir="ltr">using the wet cell batteries which may not be an issue but worth<br></div><div dir="ltr">considering.?Batteries have come so far since the Captain designed his three<br></div><div dir="ltr">models and I have wanted to upgrade to a more efficient battery myself but<br></div><div dir="ltr">have decided to stick with what?s on the plans due to space limitations and<br></div><div dir="ltr">possible weight differences.?Rick ?<br></div><div dir="ltr"><br></div><div dir="ltr">Sent from my iPhone<br></div><div dir="ltr"><br></div><div dir="ltr">On Jun 6, 2022, at 6:34 AM, Jon Wallace via Personal_Submersibles<br></div><div dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">?Looking for some brain-power deductive reasoning.? I've been following some<br></div><div dir="ltr">of these youtube channels that teardown LiFePo4 batteries to see what's<br></div><div dir="ltr">inside and also test various functions of them.? I've notice with all of<br></div><div dir="ltr">them that the actual Lifepo packs are significantly smaller than the<br></div><div dir="ltr">container they are inserted into and use padding keep them centered.? At<br></div><div dir="ltr">first I assumed this was to prevent chafing of the cells against the<br></div><div dir="ltr">container but also noticed that padding is not used on the bottom which<br></div><div dir="ltr">seems to me where most movement that might cause chafing would occur.? So<br></div><div dir="ltr">I'm left to assume manufactures are simply using padding so they can provide<br></div><div dir="ltr">LifePo batteries in industry standard battery group sizes.<br></div><div dir="ltr">Given that the battery pods on K-Subs do not lend themselves well to current<br></div><div dir="ltr">battery groups I'm curious what you guys think about repackaging current<br></div><div dir="ltr">market LifePO batteries into smaller containers.? I can't see any reason not<br></div><div dir="ltr">to do it but am sure there are some opinions out there I would want to hear.<br></div><div dir="ltr">Jon<br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr"> <br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL:<br></div><div dir="ltr"><<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/" rel="nofollow" target="_blank">http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/</a><br></div><div dir="ltr">738100c9/attachment-0001.html><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 2<br></div><div dir="ltr">Date: Mon, 6 Jun 2022 08:25:20 -0600<br></div><div dir="ltr">From: hank pronk via Personal_Submersibles<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">To: Personal Submersibles General Discussion<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Subject: Re: [PSUBS-MAILIST] Repackaged LifePo4?<br></div><div dir="ltr">Message-ID: <<a href="mailto:E937B7EF-67DE-429B-9F2A-92E5AC3A33A4@yahoo.ca" rel="nofollow" target="_blank">E937B7EF-67DE-429B-9F2A-92E5AC3A33A4@yahoo.ca</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">Jon, I had the same idea and cut the top off one of my batteries. In my case<br></div><div dir="ltr">there is little space saving height wise but there could be savings on the<br></div><div dir="ltr">width. The BMS sits on top of the cells. There is no significant padding<br></div><div dir="ltr">under the cells. If you are willing to remove the BMS board, you could<br></div><div dir="ltr">reduce the heigh by about 2 inches. This would be very doable if you built<br></div><div dir="ltr">a cage. <br></div><div dir="ltr">Hank<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Sent from my iPhone<br></div><div dir="ltr"><br></div><div dir="ltr">> On Jun 6, 2022, at 5:28 AM, Jon Wallace via Personal_Submersibles<br></div><div dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">> <br></div><div dir="ltr">> ?<br></div><div dir="ltr">> I agree, buoyancy is a factor but can be addressed by filling the battery<br></div><div dir="ltr">pods with lead or concrete weight in replacement of the original battery<br></div><div dir="ltr">weight. I believe I can literally power the entire submarine with just two<br></div><div dir="ltr">LiFePo4 batteries if I wanted to. That's attractive to me in terms of<br></div><div dir="ltr">maintenance.<br></div><div dir="ltr">> <br></div><div dir="ltr">> Jon<br></div><div dir="ltr">> <br></div><div dir="ltr">> <br></div><div dir="ltr">>> On Monday, June 6, 2022, 07:06:11 AM EDT, Rick Patton via<br></div><div dir="ltr">Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">>> <br></div><div dir="ltr">>> <br></div><div dir="ltr">>> The one thing that comes to mind Jon is that the Ksubs buoyancy is<br></div><div dir="ltr">designed using the wet cell batteries which may not be an issue but worth<br></div><div dir="ltr">considering. <br></div><div dir="ltr">>> Batteries have come so far since the Captain designed his three models<br></div><div dir="ltr">and I have wanted to upgrade to a more efficient battery myself but have<br></div><div dir="ltr">decided to stick with what?s on the plans due to space limitations and<br></div><div dir="ltr">possible weight differences. <br></div><div dir="ltr">>> Rick<br></div><div dir="ltr">>> <br></div><div dir="ltr">>> Sent from my iPhone<br></div><div dir="ltr">>> <br></div><div dir="ltr">>>> On Jun 6, 2022, at 6:34 AM, Jon Wallace via Personal_Submersibles<br></div><div dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">>>> <br></div><div dir="ltr">>> ?<br></div><div dir="ltr">>> Looking for some brain-power deductive reasoning. I've been following<br></div><div dir="ltr">some of these youtube channels that teardown LiFePo4 batteries to see what's<br></div><div dir="ltr">inside and also test various functions of them. I've notice with all of<br></div><div dir="ltr">them that the actual Lifepo packs are significantly smaller than the<br></div><div dir="ltr">container they are inserted into and use padding keep them centered. At<br></div><div dir="ltr">first I assumed this was to prevent chafing of the cells against the<br></div><div dir="ltr">container but also noticed that padding is not used on the bottom which<br></div><div dir="ltr">seems to me where most movement that might cause chafing would occur. So<br></div><div dir="ltr">I'm left to assume manufactures are simply using padding so they can provide<br></div><div dir="ltr">LifePo batteries in industry standard battery group sizes.<br></div><div dir="ltr">>> <br></div><div dir="ltr">>> Given that the battery pods on K-Subs do not lend themselves well to<br></div><div dir="ltr">current battery groups I'm curious what you guys think about repackaging<br></div><div dir="ltr">current market LifePO batteries into smaller containers. I can't see any<br></div><div dir="ltr">reason not to do it but am sure there are some opinions out there I would<br></div><div dir="ltr">want to hear.<br></div><div dir="ltr">>> <br></div><div dir="ltr">>> Jon<br></div><div dir="ltr">>> <br></div><div dir="ltr">>> _______________________________________________<br></div><div dir="ltr">>> Personal_Submersibles mailing list<br></div><div dir="ltr">>> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">>> <br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">> <br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL:<br></div><div dir="ltr"><<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/" rel="nofollow" target="_blank">http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/</a><br></div><div dir="ltr">3e45a5d6/attachment-0001.html><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 3<br></div><div dir="ltr">Date: Mon, 6 Jun 2022 12:49:46 -0700<br></div><div dir="ltr">From: David Colombo via Personal_Submersibles<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">To: Personal Submersibles General Discussion<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Subject: Re: [PSUBS-MAILIST] Repackaged LifePo4?<br></div><div dir="ltr">Message-ID:<br></div><div dir="ltr"> <CAHHFyEGjyRy2TnWcQHLWWH8xnJsrC2z+ciy1Y=<a href="mailto:VeNY-PqvG7LA@mail.gmail.com" rel="nofollow" target="_blank">VeNY-PqvG7LA@mail.gmail.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">Hi Jon, I am currently using a single battery in the VAST interior AGM,<br></div><div dir="ltr">weight of 58 lbs, dim 13.3x6.875x8.5" tall, 92 AH. My replacement lipo4 is<br></div><div dir="ltr">43.1 lbs, dim 19.02x6.7x9.45" tall, and 200AH.<br></div><div dir="ltr">This battery I will be laying on its side which gives me an additional 2<br></div><div dir="ltr">inches of vertical height, which will give me better access to the scrubber<br></div><div dir="ltr">location.The loss of weight of 14.3 lbs will be cast as a lead weight and<br></div><div dir="ltr">placed in my drop weight tray. Better center of gravity and less weight in<br></div><div dir="ltr">the aft section.<br></div><div dir="ltr">I have played with the idea of having the cells placed as an arc between the<br></div><div dir="ltr">internal t ribs as an alternative by building my own lipo4 battery pack. It<br></div><div dir="ltr">would certainly give back valuable space in the VAST with such a design,<br></div><div dir="ltr">just not sure I have the bandwidth to add another design project to my<br></div><div dir="ltr">current schedule, but you never know.<br></div><div dir="ltr">My thoughts on the battery pods, are to use the lipo4 as they come, figure<br></div><div dir="ltr">out how to add lead weights in the hollow area beneath the batteries for<br></div><div dir="ltr">some cast lead strips. At a cost $500 per battery or more depending on the<br></div><div dir="ltr">AH desired, I wouldn't cut them open. Might be cheaper to build your own.<br></div><div dir="ltr">David<br></div><div dir="ltr"><br></div><div dir="ltr">On Mon, Jun 6, 2022, 7:26 AM hank pronk via Personal_Submersibles <<br></div><div dir="ltr"><a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">> Jon, I had the same idea and cut the top off one of my batteries. In <br></div><div dir="ltr">> my case there is little space saving height wise but there could be<br></div><div dir="ltr">savings on<br></div><div dir="ltr">> the width. The BMS sits on top of the cells. There is no significant<br></div><div dir="ltr">> padding under the cells. If you are willing to remove the BMS board, <br></div><div dir="ltr">> you could reduce the heigh by about 2 inches. This would be very <br></div><div dir="ltr">> doable if you built a cage.<br></div><div dir="ltr">> Hank<br></div><div dir="ltr">><br></div><div dir="ltr">><br></div><div dir="ltr">> Sent from my iPhone<br></div><div dir="ltr">><br></div><div dir="ltr">> On Jun 6, 2022, at 5:28 AM, Jon Wallace via Personal_Submersibles < <br></div><div dir="ltr">> <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">><br></div><div dir="ltr">> ?<br></div><div dir="ltr">> I agree, buoyancy is a factor but can be addressed by filling the <br></div><div dir="ltr">> battery pods with lead or concrete weight in replacement of the <br></div><div dir="ltr">> original battery weight. I believe I can literally power the entire <br></div><div dir="ltr">> submarine with just two<br></div><div dir="ltr">> LiFePo4 batteries if I wanted to. That's attractive to me in terms of <br></div><div dir="ltr">> maintenance.<br></div><div dir="ltr">><br></div><div dir="ltr">> Jon<br></div><div dir="ltr">><br></div><div dir="ltr">><br></div><div dir="ltr">> On Monday, June 6, 2022, 07:06:11 AM EDT, Rick Patton via <br></div><div dir="ltr">> Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">><br></div><div dir="ltr">><br></div><div dir="ltr">> The one thing that comes to mind Jon is that the Ksubs buoyancy is <br></div><div dir="ltr">> designed using the wet cell batteries which may not be an issue but <br></div><div dir="ltr">> worth considering.<br></div><div dir="ltr">> Batteries have come so far since the Captain designed his three models <br></div><div dir="ltr">> and I have wanted to upgrade to a more efficient battery myself but <br></div><div dir="ltr">> have decided to stick with what?s on the plans due to space <br></div><div dir="ltr">> limitations and possible weight differences.<br></div><div dir="ltr">> Rick<br></div><div dir="ltr">><br></div><div dir="ltr">> Sent from my iPhone<br></div><div dir="ltr">><br></div><div dir="ltr">> On Jun 6, 2022, at 6:34 AM, Jon Wallace via Personal_Submersibles < <br></div><div dir="ltr">> <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><div dir="ltr">><br></div><div dir="ltr">> ?<br></div><div dir="ltr">> Looking for some brain-power deductive reasoning. I've been following <br></div><div dir="ltr">> some of these youtube channels that teardown LiFePo4 batteries to see <br></div><div dir="ltr">> what's inside and also test various functions of them. I've notice <br></div><div dir="ltr">> with all of them that the actual Lifepo packs are significantly <br></div><div dir="ltr">> smaller than the container they are inserted into and use padding keep <br></div><div dir="ltr">> them centered. At first I assumed this was to prevent chafing of the <br></div><div dir="ltr">> cells against the container but also noticed that padding is not used <br></div><div dir="ltr">> on the bottom which seems to me where most movement that might cause <br></div><div dir="ltr">> chafing would occur. So I'm left to assume manufactures are simply <br></div><div dir="ltr">> using padding so they can provide LifePo batteries in industry standard<br></div><div dir="ltr">battery group sizes.<br></div><div dir="ltr">><br></div><div dir="ltr">> Given that the battery pods on K-Subs do not lend themselves well to <br></div><div dir="ltr">> current battery groups I'm curious what you guys think about <br></div><div dir="ltr">> repackaging current market LifePO batteries into smaller containers. <br></div><div dir="ltr">> I can't see any reason not to do it but am sure there are some <br></div><div dir="ltr">> opinions out there I would want to hear.<br></div><div dir="ltr">><br></div><div dir="ltr">> Jon<br></div><div dir="ltr">><br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">><br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">><br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">><br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Personal_Submersibles mailing list<br></div><div dir="ltr">> <a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr">> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL:<br></div><div dir="ltr"><<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/" rel="nofollow" target="_blank">http://www.whoweb.com/pipermail/personal_submersibles/attachments/20220606/</a><br></div><div dir="ltr">5fa15c31/attachment.html><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Subject: Digest Footer<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">End of Personal_Submersibles Digest, Vol 107, Issue 2<br></div><div dir="ltr">*****************************************************<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div></div>
</div>
</div></body></html>