car battery

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  1. C

    How to charge One cell dead Lead acid batteries?

    I have a couple of old lead acid batteries, both have voltage around 10V which means one cell is dead. I want to use them for some other purposes like lighting up some LEDs before selling them for scrap. I can use a boost (step up) converter to get 12V out of them. But how do I charge them...
  2. A

    Install a basic sound system on a soviet car

    Hello all, I bought a very simple car of soviet design (a lada) that doesn’t have a sound system installed on it. I want to build a basic setup to plug my iPod in via jack 3.5mm to be able to listen to music when driving that car. I can get cheap 12v AC 100w mono amplifier boards here in the...
  3. K

    Can a car battery possibly kill an otherwise OK UPS?

    In the hope that there are some experienced people here, I am trying to find the reason why and how I killed a UPS. To make a long story short I attached a car battery to an old MGE Nova AVR 600 (360W/600VA) for testing to see if it can handle a single computer. When I disconnected the line...
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