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I'd just like a bit of advice please. I bought a replacement AGM 12V battery for my PHEV (sorry!) secondhand, but advertised as less than a year old, and at a very good price, however it doesn't appear to last very long - especially when I've been hacking the car, and modding it's options. Before I assume there's something wrong, and get back in touch with the seller, I'd like to be sure that I've got a problem or not, so what is the best way of checking a 12V battery out before a warranty claim ?
