For various reasons (#BurningMan) I own a number of SLA batteries. Unfortunately, I put them into storage thinking they were mostly charged, and just pulled them out to find they were not chargered and may be dead. Anyway, one definitely is dead, but the second one I'm trying to charge is actually charging. So I might have power at ToorCamp!
I wanted to check on it but I didn't want to go back to the shed, so I put an orangepi with a shitty webcam and no light. 2 red lights means more than 20% charged, less than 50% charged (second one is presumably blinking).