Key fob batteries.

[HRG]

Is it just a simple change them jobbie or will the plipper need re syncing to the car? Forewarned is forearmed and all that...

[Hamburglar]

I've recklessly torn out the batteries without your sensible forethought HRG, luckily without ill effect!

Go for it!

[HRG]

But dare I act on the potentially reckless advice of such a person though

[FlipFlopGriff]

Get mine from here:
http://www.smallbattery.company.org.uk/sbc_1220.ht...

You can just take themn out and swap them - there are 2 in each fob!
FFG