<div dir="ltr"><div>Hi Alan, one of the fuse is a self reset fuse based upon temperature. The other im not so sure. The original batteries were 1.2 volts (5) total for 12v. If i go with the 16050 li batteries I have as new cells, they are 3.7v, charge to 4.2, discharge to 3.0v. I was thinking that I would go with 4s2p for a total of 8 batteries at 14.8v I could be wrong, but dont I even need a bms even for this small quantity? As I have never built a Li battery before, I figured that a small unit will be the start to be a bigger battery pack. <br></div><div><br></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Best Regards,<br>David Colombo<br><img src="http://static.squarespace.com/static/533310a9e4b0fba62008a464/t/5339c1f2e4b041bac4e25d1b/1396294132055/?format=500w" width="200" height="110"><br>804 College Ave<br>Santa Rosa, CA. 95404<br>(707) 536-1424<br><a href="http://www.SeaQuestor.com" target="_blank">www.SeaQuestor.com</a><br><br></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 18, 2020 at 5:35 PM Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:16px"><div></div>
<div>David, the electronics may be a low voltage protection circuit, or a low high voltage protection circuit so you don't overcharge the batteries. </div><div>As Sean says, if you replace with lithium you have to match the battery voltage. Lithium Iron batteries have a nominal voltage of 3.7 but can be charged to 4.2, & discharged to a minimum of 3V. So that gives 2 options, a 3 cel or 4 cel configuration. So 4 cel would be just above 16.6V and could be used down to 12V (very minimum) or 3 cel 12.6V & 9V minimum. </div><div>Alan</div><div><br></div>
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On Saturday, December 19, 2020, 09:24:43 AM GMT+13, David Colombo via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="gmail-m_5988519978360655824ydp43b7ef17yiv9314675217"><div><div dir="ltr"><div>Hi Alan, The unit in the sub I can. The topside unit I was hoping to keep the unit intact in case it could also be used as a diver unit.</div><div><br clear="none"></div><div><div><div dir="ltr"><div dir="ltr"><div>Best Regards,<br clear="none">David Colombo<br clear="none"><img src="http://static.squarespace.com/static/533310a9e4b0fba62008a464/t/5339c1f2e4b041bac4e25d1b/1396294132055/?format=500w" width="200" height="110"><br clear="none">804 College Ave<br clear="none">Santa Rosa, CA. 95404<br clear="none">(707) 536-1424<br clear="none"><a shape="rect" href="http://www.SeaQuestor.com" rel="noreferrer noopener" target="_blank">www.SeaQuestor.com</a><br clear="none"><br clear="none"></div></div></div></div><br clear="none"></div></div><br clear="none"><div><div id="gmail-m_5988519978360655824ydp43b7ef17yiv9314675217yqt58066"><div dir="ltr">On Fri, Dec 18, 2020 at 12:03 PM Alan James via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="noreferrer noopener" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:16px"><div></div>
<div>David, </div><div>can you just wire them in to 12V in the boat & forget about the battery packs, or are you intending to use them for scuba diving. </div><div>Alan</div><div><br clear="none"></div>
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On Thursday, December 17, 2020, 06:39:22 AM GMT+13, David Colombo via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="noreferrer noopener" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="gmail-m_5988519978360655824ydp43b7ef17yiv9314675217gmail-m_-3717026299756222954ydpe44bb683yiv0991234619"><div>Hi guys, I torn down the one battery I got with my magnacom units so I can build a couple more. Attached are photos of the teardown. Only problem is one component that only had labeling on one side. The other side had only the letters va with a smudge over other data. I think it's a fuse based on the fact it interrupts the circuit. I sketched out the circuit for reference. I thought taught there might be a BMS, but apparently not. Jon, to recreate the circuit board component, would you recommend having done by a fabricator? Any ideas or thoughts would be appreciated.<div><div>Thanks,</div><div>David</div></div></div></div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="noreferrer noopener" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer noopener" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div>
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