On Sat, 05 Jan 2019 18:31:01 -0000, wrote:

On Saturday, 5 January 2019 15:23:19 UTC, Commander Kinsey wrote:

I wasn't aware lead acids were so fragile. I have my old car connected to an old Bradex 4A charger 24/7, as the alarm runs the battery flat. The charger indicates it's delivering 0.5 amps after it's been sat for a while, and I've measured it at 14.4V. Surely charging a 60Ah battery at 0.5A (which is a 5 day charge!) can't possibly break it?

Unregulated chargers have killed many batteries when left on too long.

I'm not so sure lead acids are that fussy. Everybody tells me you must never flatten one, yet I've had a battery which I let run completely flat about 20 times, and it still works fine. And I don't believe overcharging it at a 5 day charge rate could kill it. Oh well, if it breaks it breaks, I've loads of batteries kicking about. I'll buy a nicer charger if it dies. I was going to get a Li-Ion battery if it died (they'd have their own charge protection), but since those cost WAY more than I thought, I won't bother.