search for: 36ah

...Using car batteries =================== Btw, I'm using car batteries in my UPS. Since I couldn't find any experience report about that in google, here's mine: The SMART-UPS 2200 (European version, 110V models may be different) operates at 48V. So I connected four el cheapo batteries (36Ah) in series. They served almost five hours with 17% load on my SmartUPS 2200. That sounds good, but I have no idea of the lifetime yet. I'm a bit concerned about the different capacity of the batteries: Since the batteries are connected in series, the weakest one will be discharged the most, wh...