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They are rarer these days, but look into external laptop batteries, e.g. BP160 and the various clones, the charge balancer / maintenance in these units is surprisingly well built, my one is still working 6 years after purchase, I will note at the 5 year mark, 2 of the cells failed shorted due to being flat for too long (9 months) but even with this, it still outputs 12V without issue. just loosing some capacity (all batteries are a series string, it has a built in buck converter on the output),
Ignore any claim of mAh, look at the watt hours and divide by 12, that will give you your expected 12V Amp hours.
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