On Fri, 29 Jul 2011 11:13:54 +0100, Tim Lamb
wrote:

Charger from original suppliers is around £70.00 del. whereas there
appear to be chargers available on line for around £25.00.

Most wheelchairs use two batteries in series to give 24V. 24V sealed
lead acid chargers are less common and hence more expensive. The
wheelchair ones tend to be quite complex as well.