On Fri, 08 May 2015 12:52:18 +0100, Andy Burns wrote:

The "Current Cost" one that I got free from e.on used a single D cell,
and I never had to replace it in the years I had it.

I have a Current Cost. I've replaced the batteries in the Tx once. I
thought it was 2 x C cells but having just opened up it up it's 2 x D
cells. I bought it in Feb 09.

The display runs off a wall wart and has no built in battery facilty.

--
Cheers
Dave.