[keithC70]

I have 3 x 110 ah batteries (off my boat for domestic supply) which weren't holding their charge so I took them to a battery supplier and asked him to check them for me.

He connected a super-dooper bit of kit that he'd just paid £1000 for and announced that they were fine. I knew they weren't!

I told him that I'd seen a test where a big load was put on the battery for a few seconds and he eventually reluctantly dug out the heavy duty old tester from the back of the garage. It whacks a huge load across - 80 amps or so just like a diesel car starting!

He tested each battery and, ............ "they're f*****d" he said!

You can't beat the simple old methods!