In article .com,
wrote:
But if you or anyone else wants to have a go I have some pukka 5 amp
12 volt charging transformers designed for the job - all you'd need is
a rectifier and possibly a means of limiting the maximum current. I
got a crate of them off Ebay along with some other stuff and you can
have one for the cost of the postage.

SLAs have different charging requirement to non-gel cells. They should
not be charged with a car or bike charger. Charging v should be
significantly lower.

Assuming a reasonably large battery and a normal sort of domestic charger,
the internal impedance of the battery will prevent the voltage rising too
high to damage an SLA until it is near fully charged. Of course the
correct charger should be used, but other methods can be devised for a
cheap and cheerful solution as it would appear is needed.

--
*Avoid clichés like the plague. (They're old hat.) *

Dave Plowman London SW
To e-mail, change noise into sound.