<html><head></head><body><div class="ydpa1fa2b08yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div></div>
<div>David, </div><div>how are you going with your battery problem. </div><div>Did a little bit of googling on NIMH batteries & found this.... </div><div><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;">Unfortunately </span><b style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px; min-height: 999999px;">charging NiMH nickel metal hydride batteries</b><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;"> is not as easy to achieve compared to other types of cell or </span><b style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px; min-height: 999999px;">battery</b><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;">. The </span><b style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px; min-height: 999999px;">NiMH</b><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;"> cells, like NiCds </span><b style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px; min-height: 999999px;">require charging</b><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;"> using a constant current. The rate of </span><b style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px; min-height: 999999px;">charge</b><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;"> is normally specified on the case of the cell and this rate should not be exceeded.</span><br></div><div><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;">It looks to me that the electronics would be a constant current charging circuit. Maybe it has an over voltage cut out. </span></div><div><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;">You could possibly leave the circuit out & buy a Nimh charger suitable for 12V & take them out & charge them. </span></div><div><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;">Alan</span></div><div><span style="color: rgb(60, 64, 67); font-family: Roboto, HelveticaNeue, Arial, sans-serif; font-size: 18px;"><br></span></div><div><br></div>
<div id="ydpa1fa2b08yahoo_quoted_9355399926" class="ydpa1fa2b08yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Thursday, December 17, 2020, 06:39:22 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="ydpa1fa2b08yiv2746167230"><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>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br><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>