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RommudohHere are a few more boards, one for 4S and two for 3S. The last one is attached to a triple 18650 battery holder and will be tested with real cells soon. So far all tests look fine. The 4S and 3S LiIon were soldered using hot air and solder paste (except the MOSFETs, those were already soldered using a normal iron). This was a very pleasant experience and I will use it more often. <a href="https://social.tchncs.de/tags/soldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#soldering</a> <a href="https://social.tchncs.de/tags/diyelectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#diyelectronics</a> <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> <a href="https://social.tchncs.de/tags/lithiumbattery" class="mention hashtag" rel="nofollow noopener" target="_blank">#lithiumbattery</a> #18650 <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a> <a href="https://social.tchncs.de/tags/hotairsoldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#hotairsoldering</a> <a href="https://social.tchncs.de/tags/solderpaste" class="mention hashtag" rel="nofollow noopener" target="_blank">#solderpaste</a>

RommudohAnd I finished <a href="https://social.tchncs.de/tags/soldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#soldering</a> the first <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> board. It's configured for a 5S LiIon <a href="https://social.tchncs.de/tags/battery" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery</a> with 5A output current limit. Here the finished board and the test setup. So far, it works as intended. It cuts discharge at 4.91A, or when battery voltage drops below 14.5V. Charging is disabled when voltage gets too high. I'll still have to test the temperature behavior, and how balancing works. When I'm satisfied, I'll try with real cells. <a href="https://social.tchncs.de/tags/diyelectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#diyelectronics</a> <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a>

RommudohMy <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> <a href="https://social.tchncs.de/tags/PCBs" class="mention hashtag" rel="nofollow noopener" target="_blank">#PCBs</a> arrived from <a href="https://aisler.social/@aislerhq" class="u-url mention" rel="nofollow noopener" target="_blank">@aislerhq</a> and they look nice. I designed it because I couldn't find 3S BMS for <a href="https://social.tchncs.de/tags/LiFePO4" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiFePO4</a> cells and didn't like the voltage thresholds of the cheap <a href="https://social.tchncs.de/tags/LiIon" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiIon</a> ones. It uses the <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a> chip from <a href="https://social.tchncs.de/tags/TexasInstruments" class="mention hashtag" rel="nofollow noopener" target="_blank">#TexasInstruments</a>. Size is 63x50mm. While fetching all components according to the BOM, I noticed the <a href="https://social.tchncs.de/tags/diode" class="mention hashtag" rel="nofollow noopener" target="_blank">#diode</a> had the <a href="https://social.tchncs.de/tags/footprint" class="mention hashtag" rel="nofollow noopener" target="_blank">#footprint</a> SOT-323 assigned. I only have SOT-23 ones :blobcatgoogly: I'm glad that I can still make it fit, and the third leg isn't used at all (it's a single diode). Can't wait to find some time to finish soldering a few and try them out. It supports 3S up to 5S, and I added <a href="https://social.tchncs.de/tags/silkscreen" class="mention hashtag" rel="nofollow noopener" target="_blank">#silkscreen</a> part to mark how it's configured. The back has detailed instructions, so I don't forget them.

smallsolarMy portable power station (li-ion <a href="https://techhub.social/tags/battery" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery</a> with built in inverter) has stopped charging, opening it up carefully it's not clear what's wrong but it's not the sort of thing you really want to mess with. It's quite old AllWinner model (so not a particularly good brand).Therefore I've got 288Wh of li-ion 3.7v cells, I'm thinking of looking for a new BMS as feels a waste to just not use, any ideas/thoughts from the fediverse<a href="https://techhub.social/tags/reuse" class="mention hashtag" rel="nofollow noopener" target="_blank">#reuse</a> <a href="https://techhub.social/tags/li" class="mention hashtag" rel="nofollow noopener" target="_blank">#li</a>-ion <a href="https://techhub.social/tags/solar" class="mention hashtag" rel="nofollow noopener" target="_blank">#solar</a> <a href="https://techhub.social/tags/battery" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery</a> <a href="https://techhub.social/tags/batteries" class="mention hashtag" rel="nofollow noopener" target="_blank">#batteries</a> <a href="https://techhub.social/tags/bms" class="mention hashtag" rel="nofollow noopener" target="_blank">#bms</a>

Wordmark<a href="https://tech.lgbt/@Lydie" class="u-url mention" rel="nofollow noopener" target="_blank">@Lydie</a> yes <a href="https://mas.to/tags/JKBMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#JKBMS</a> IF MONITORED regularly (can only do <a href="https://mas.to/tags/bluetooth" class="mention hashtag" rel="nofollow noopener" target="_blank">#bluetooth</a> with app from <a href="http://www.enjpower.com/" rel="nofollow noopener" translate="no" target="_blank">http://www.enjpower.com/</a> <a href="https://mas.to/tags/enjpower" class="mention hashtag" rel="nofollow noopener" target="_blank">#enjpower</a>) can report bad cells as going way too high way to fast (4.3V???) <a href="https://mas.to/tags/datasheed" class="mention hashtag" rel="nofollow noopener" target="_blank">#datasheed</a> <a href="https://mas.to/tags/eve" class="mention hashtag" rel="nofollow noopener" target="_blank">#eve</a> <a href="https://mas.to/tags/LiFePo4" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiFePo4</a> <a href="https://www.battery-germany.de/wp-content/uploads/2022/02/LF280K-280Ah-Product-Specification-Version-B.pdf" rel="nofollow noopener" translate="no" target="_blank">https://www.battery-germany.de/wp-content/uploads/2022/02/LF280K-280Ah-Product-Specification-Version-B.pdf</a> <a href="https://ultimate-solar.com/wp-content/uploads/2025/04/LifePo4-EVE-Datasheed-Datenblatt-LF280K-280Ah-Product-Specification-Version-B-prismatic-prismatisch.pdf" rel="nofollow noopener" translate="no" target="_blank">https://ultimate-solar.com/wp-content/uploads/2025/04/LifePo4-EVE-Datasheed-Datenblatt-LF280K-280Ah-Product-Specification-Version-B-prismatic-prismatisch.pdf</a> this guy and others on <a href="https://mas.to/tags/youtube" class="mention hashtag" rel="nofollow noopener" target="_blank">#youtube</a> keep promoting <a href="https://mas.to/tags/eve" class="mention hashtag" rel="nofollow noopener" target="_blank">#eve</a> <a href="https://mas.to/tags/lifepo4" class="mention hashtag" rel="nofollow noopener" target="_blank">#lifepo4</a> <a href="https://www.youtube.com/@Akkudoktor/videos" rel="nofollow noopener" translate="no" target="_blank">https://www.youtube.com/@Akkudoktor/videos</a>this is what a bad cell looks like vendor refuses <a href="https://mas.to/tags/warranty" class="mention hashtag" rel="nofollow noopener" target="_blank">#warranty</a> :( voltage too fast too low or too high (<a href="https://mas.to/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> stops discharging or charging to prevent <a href="https://mas.to/tags/BatteryFIRE" class="mention hashtag" rel="nofollow noopener" target="_blank">#BatteryFIRE</a>)

Dendrobatus AzureusIt has taken me about 12 minutes to cool down an 18650 battery which was heating up, that it was almost too warm to the touch. The battery was in the charger which clearly doesn't properly communicate with the BMS, creating a fairly dangerous situation The battery in someone else's hand could have spontaneously combusted into flames igniting the charger and then the wood of the table it was standing on. I have a habit of standing up, way in the depths of the night, either because I want to go training on my race machines, or because I want to physically feel how warm the batteries are that I'm charging.Today I'm very glad that I routinely do this, because the BMS failed, a temperature sensor is obviously absent in the charger, and the chemicals would have potentially created a runaway situation because the battery was running this hot for at least a couple of hours!The 18650 cell delivers the energy that is needed just fine it just cannot charge to 100% anymoreOf course I have marked the cell, so I can now manually remove it from the charger <a href="https://mastodon.bsd.cafe/tags/Electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electronics</a> <a href="https://mastodon.bsd.cafe/tags/battery" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery</a> <a href="https://mastodon.bsd.cafe/tags/cell" class="mention hashtag" rel="nofollow noopener" target="_blank">#cell</a> <a href="https://mastodon.bsd.cafe/tags/battery18650" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery18650</a> <a href="https://mastodon.bsd.cafe/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> <a href="https://mastodon.bsd.cafe/tags/charger" class="mention hashtag" rel="nofollow noopener" target="_blank">#charger</a> <a href="https://mastodon.bsd.cafe/tags/temperature" class="mention hashtag" rel="nofollow noopener" target="_blank">#temperature</a> <a href="https://mastodon.bsd.cafe/tags/heat" class="mention hashtag" rel="nofollow noopener" target="_blank">#heat</a> <a href="https://mastodon.bsd.cafe/tags/sensor" class="mention hashtag" rel="nofollow noopener" target="_blank">#sensor</a>

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