[Diabolical Artificer]

There's a bit more to charging sealed lead batteries, shoving loads or amps down them at first shortens their life. From the attached bumf at first a CC charge, then a CV charge is the way to go, so some sort of regulation would be needed, either that or a few switchable resistors, apologies if this is teaching elderly relatives to masticate and imbibe chicken arse bullets.

I have a few dead Alcatel 12v PSU's (PCB with with big diodes and simple 723 regulation) and some gurt big switches if you'd like em Malc, drop us a PM if so.

Andy.