batteries
    ub1290 12v 9a F1/2
    (not really sure about the F number for the terminal size, but i
    bought 2 batteries of what seemed to be F1 and 1 which supposedly
    was F2, and they all seemed the same and worked fine)

batteries replaced June 2018

batteries replaced April 3, 2023
	LiON batteries, should last 8-10 years
	see LiFePO4 pdf pages