SWMBO uses an "AquaJoy" bath lift. This is powered from a hand control unit, which contains the batteries.
Looks suspicious like batteries are dying, so I thought I would Google for "AquaJoy battery pack/replacement". The returned results as so suspiciously not what I asked for, that I'm betting it's "you have to buy something a lot bigger".
Opening the hand control reveals:
which looks very much like someone has taped 11 1.2V NiMh batterys together ...
Does anyone know of a possible source for replacements ?