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military battery chargin


irmir10
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i have bought a military battery at a yard sale and i want to make a solar rig with it i have successfully discharged from it using the positive and negative holes but i cant seem to charge it using the same method can anyone try to help me?

thanks

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the positive is the upper hole and the ground is the bottom hole, does anyone know whats the hole next to the negative is for?

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3 hours ago, irmir10 said:

but i cant seem to charge it using the same method

It might be like the batteries that come with portable drills and the like. These have built-in BMS which prevent over-discharge, but also manage charging. The ones I'm slightly familiar with have two terminals for charging, T1 and T2; yours seems to have only one.

You might get some clues from this topic in an EV forum:

https://www.diyelectriccar.com/threads/ryobi-40v-bms-troubleshooting-and-repair.197409/#post-1011209

So you might just have to drag the non-discharge terminal towards one or the other (use a resistor to limit current, start with 100 kΩ and work down to maybe 1 kΩ), or you might have to send data. If the latter, you're likely to have to just pull it apart and re-use just the cells. If the former, you could rig up a special plug for charging.

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