In message , John Williamson
writes
brass monkey wrote:
"geoff" wrote in message
...
On the subject of batteries, whats the best way of rejuvinating a
sulphated dead battery, whack it with rectified mains with a bulb for
a load ?
We used to do similar to that for blowing crap off crt guns.

Fully charge it at the ten hour rate, take it off charge for a couple
of days and repeat. Sometimes helps, but not a lot.

You used to be able to buy pills to drop into the electrolyte (EDTA =
ethalene diamine tetra acetic acid), which helped a bit.

If they were *really* bad and refused to take a charge any other way,
we used to whack 'em across a heavy duty 24V start/ charge unit on flat
out for a minute or two, (About 100 amps...) then charge as normal.
That often got another week or two of use out of them. It was kill or
cure, though.

The only source I have of 100A is another battery


Otherwise, flog 'em for scrap and buy new ones, which often have more
capacity in a smaller case, anyway.

Just want to put an old battery on an old car to flog it


There's an American unit by Pulse tech, which claims to do the job.


Yeah - seems to do what I typed above

which is why I typed it

bit of flex and a 10A bridge rectifier it is, then


--
geoff