The message
from "Doki" contains these words:

Is it possible to DIY up a 6V charger for old car batteries, or to buy one
cheap?

Quite a lot of chargers still cater for 6V as many smaller motorbikes
run on this. Of course, the output's lower...
http://www.maplin.co.uk/Module.aspx?...EO&U=strat1 5
I know it says up to 5Ah, but it'd just take longer.

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