In message , John Williamson
writes
Tim Lamb wrote:
Is there any essential difference in charger specification for gel
batteries fitted to motorised wheelchairs as opposed to conventional
lead acid?

Yes, gel electrolyte battery chargers have better output voltage and
current control than normal chargers.

For cheapness, Maplin do a couple of chargers suitable for gel
electrolyte lead acid batteries.

http://www.maplin.co.uk/power/batter...acid-batteries

You may need to sort out a connector to match the one on the chair.

Check the voltage used on the chair, too, as I think some of them are
24 volt, not 12.

Ah! This particular battery is 12V 20Ah so perhaps I am being too
parsimonious:-)

regards

--
Tim Lamb