Fredxxx wrote:

If you're in doubt, leave the name of your zero rated battery supplier
here and see if a few months down the line they still provide zero rated
batteries.

It would be a poor do if HMRC chased a disability specialist for this.
Who's to say who fitted the battery? I've been using the same two firms
for years without any problem. I think even HMRC has a modicum of common
sense.

Bill