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I don't have a scale to measure the weight. It's really small compared to a 14 Ah lead battery. About half the height and 1/4 the weight is my guess, if not more. It runs on my 650 without any problem and starts so quickly due to just having 4p gives me around 80cranking amps (20C) nominal with peak at (30C) 120 amps. I build a larger pack of 4s8p and it was enough to start my Jeep Cherokee just as quickly as the Optima (1000cca) battery. So it's likely a 4s4p can still be made smaller to a 4s3p or even 4s2p. Only reason I have not made it smaller is I worry it won't have the capacity to keep the headlights on for more than a hour. Wish I could be of more help.
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