On Tue, 03 Jul 2012 14:08:10 +0100, "Dave Plowman (News)"
wrote:

Have a mate with one of these - and he's been quoted some ridiculous
figure for new batteries.

Is it worth me looking at it and seeing if I can find a cheaper way?

Most certainly.
It's likely SLA, so have a look at www.component-shop.co.uk