The message
from Andy Dingley contains these words:

Maplin do one - but it's low powered but has the advantage of changing
to trickle when full.

Why is that an advantage ?

Because it means you can leave it overnight. Obviously leaving it on all
the time would be silly and not something you'd want to do with that
sort of charger but it does mean you don't have to sit and watch it like
a hawk.

--
Skipweasel
Pay no attention to that man behind the curtain.