I have a battery. I can go get a screwdriver from the garage and open it to see the specs on it, but was for an electric bike. I don't have the AC adapter charger any more. Can I charge it with a universal AC adapter I have, just wired together? The AC adapter has two holes in the tip, and I was able to determine which hole was positive and which was negative by using a voltmeter. The universal AC adapter is variable voltage with several settings from about 2V to 12V. The old AC adapter charger for this battery output 24V. I'll go open this battery up and see the specs on it. I would really like to charge it. Also, (this is secondary), I'd like to attach my inverter for my car to this battery. Any tips or advice? Edit: Okay, I opened up the case of the battery and it's two 12 volt lead-acid rechargeable batteries in series, which would effectively be 24V (I think - it is 24V maybe I meant parallel). And thanks Jehan, that is what I'm looking for. Now if I can just connect it to my inverter I have for my car.. And if anyone else has any more tips, advice, or direction, please feel more than welcome. The more knowledge that I can get, the better.