On 05/04/2018 15:38, Me wrote:
I have JS5IN1 (jump starter) which hasn't seen the light of day for some
time. The batteryÂ* is flat, the worklight come son quite brightly but
otherwise nothing.Â* I have attempted to charge it using it's own charger
plug with little result, the compressor will run for a short time but
that's it.

I have a "smart" battery charger the instructions of which suggest it
might be able to revitalise a flat battery.Â* Can I connect this directly
to the JS5IN1 across it's jump cables without doing any damage?Â* Taking
the battery out to charge it would probably be a better option but none
of my screwdrivers will fit the screws I assume hold the case together.

There is a lot of varied expertise in this group so any thoughts?

Thanks.

Going slightly OT, pulled an apparently dead 105 AH leisure battery out
of a caravan yesterday (hadn't been used for months and the charging
circuit claimed it was dead when on mains hookup).

Gave it best part of a pint of demin water and stuck it on charge on a
traditional charger, this morning all the cells are bubbling nicely and
it's showing over 14 volts immediately after disconnection. Will stick
it on a smart charger for a few days but I'm quite hopeful.