They say they have designed the battery chemistry so it doesn't get damaged when left on the charging base for long periods so I wonder if the discharge maybe a byproduct of that?.

I have just bought one for weekend use in the garden / shed so I'll just leave it sat on the base in between and not worry about it.

After looking for an alternative I decided I was cutting my nose off to spite my face not going for the Move and really glad I bought it, sounds excellent.

I leave the ‘Move’ on its charger-loop in the house most days (and nights) and it’s been fine… I have had it since they were first released and the battery still lasts all day whilst off it’s charger and playing when taken outdoors …and I agree the ‘Move’ is a great sounding speaker.