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scratching my head as to why this was overlooked, everyone got CCA - cold cranking amps, but no mention of RC - reserve capacity which is how many minutes it can deliver 25 amps before falling below 10.5v (or possibly 10.9v, but either way its the usual battery cutoff voltage)
so to convert it to A/hr just quickly, its RCx25/60, so this one is = 140x25/60. or 140x25 = 3500, then divided by 60 you get 58 A/hr.
as someone pointed though, running a non deep cycle battery that low will wreck it pretty quickly. I've used and abused marine combined deep cycle starting batteries for years and wish I had one for my current patrol. They last longer and are more robust to boot.
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