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25' is the usual limit for a shallow well jet pump. 12' will be fine, even if there is draw down (which can't go lower than 25' because your well is only 25').
But if nobody bought cobalt, then my guess is that these children would be put to work doing other, similarly bad labor. So not buying lithium/NiCd/NiMH batteries doesn't help this "must be solved" problem.
AFAIK, fully charged battery voltage isn't a reliable indicator of battery AH capacity. I see that the above comment has been edited to reflect the same idea.1
> fully charge them individually before putting them in parallel.
And then verify that all are about the same in resting voltage or specific gravity.1
I've taken complete showers on a pressure tank alone.1