I have a Li-Time 12.8V 12AH LFP battery I have no use for. its never been used other than testing.its been sitting a couple months and still has a 13.16V charge. It would make an awesome battery for a small to middling telescope that needs 12VDC. You can charge it with a ~ 2-4 amp 14.4V supply,and it should be good for many 1000s of full charge/discharge cycles.
I'll happily sell this to anyone willing to come to Santa Cruz, and pay me about 1/2 the price of a new one, in cash. Heck, buy me a beer and tacos at a santa cruz brewery of my choice, and you can have it.
-- -john r pierce
recycling used bits in santa cruz