[PSUBS-MAILIST] Repackaged LifePo4?

[hank pronk via Personal_Submersibles]

Jon, I had the same idea and cut the top off one of my batteries. In my case there is little space saving height wise but there could be savings on the width.  The BMS sits on top of the cells.   There is no significant padding under the cells.  If you are willing to remove the BMS board, you could reduce the heigh by about 2 inches.  This would be very doable if you built a cage. 
Hank


Sent from my iPhone

> On Jun 6, 2022, at 5:28 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I agree, buoyancy is a factor but can be addressed by filling the battery pods with lead or concrete weight in replacement of the original battery weight.  I believe I can literally power the entire submarine with just two LiFePo4 batteries if I wanted to.  That's attractive to me in terms of maintenance.
> 
> Jon
> 
> 
>> On Monday, June 6, 2022, 07:06:11 AM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> The one thing that comes to mind Jon is that the Ksubs buoyancy is designed using the wet cell batteries which may not be an issue but worth considering. 
>> Batteries have come so far since the Captain designed his three models and I have wanted to upgrade to a more efficient battery myself but have decided to stick with what’s on the plans due to space limitations and possible weight differences. 
>> Rick  
>> 
>> Sent from my iPhone
>> 
>>> On Jun 6, 2022, at 6:34 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>> 
>> Looking for some brain-power deductive reasoning.  I've been following some of these youtube channels that teardown LiFePo4 batteries to see what's inside and also test various functions of them.  I've notice with all of them that the actual Lifepo packs are significantly smaller than the container they are inserted into and use padding keep them centered.  At first I assumed this was to prevent chafing of the cells against the container but also noticed that padding is not used on the bottom which seems to me where most movement that might cause chafing would occur.  So I'm left to assume manufactures are simply using padding so they can provide LifePo batteries in industry standard battery group sizes.
>> 
>> Given that the battery pods on K-Subs do not lend themselves well to current battery groups I'm curious what you guys think about repackaging current market LifePO batteries into smaller containers.  I can't see any reason not to do it but am sure there are some opinions out there I would want to hear.
>> 
>> Jon
>> 
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