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I just acquired ....
Some 12v 7AH batteries ... about 5 of them in good nick.
They just did a full maintenence of the big 20 KW APC UPS at work.
It uses 8 x 12v batteries(13.2V actually ) to make up 100 v modules and they replaced the lot, about 12 modules.
So I pulled one open, tested the 8, only one dud at 11.1 v and grabbed 5 of the best all over 13.2 v each for a portable power supply for the mount, fans etc.
Parallel them up for ~ 35 Amp Hours. Should keep things humming for a while.
I'll work up a design and build and post pics\instructions for any interested people. Might try and grab a few more.
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