I'm looking for a build-it-yourself option for a lead acid battery
charger. Must be able to charge 6v batteries, and preferably 4v and 2v
as well (when I find some - anyone know suppliers in UK???). Features
I'd like a
a) Switchable between one pair of batteries in use and another on
charge, so I have permanent charge
b) Overcharge protection so at the end of charging the batteries float
c) Able to charge a couple of 6v 12Ah batteries in ideally approx. 4
hours

I want a complete solution in one box. I'm fine about building a
suitable circuit, or a kit would be good too. Built unit would be OK if
it does all this. I did look at the Optimate 111 12v charger which
boasts many automatic functions. Would this be able to properly charge
two 6v batteries in series?

http://cgi.ebay.co.uk/NEW-OPTIMATE-1... QcmdZViewItem