Sterling DC DC battery chargers

[TigerST]

Very true , but even .6v can increase the efficiency of a boost regulator, having seen some that cutout at 12.7v so 12.4v plus .6v will bring it up just enough to keep the charger working

Very true. But why risk it when you can get for them same price one made for your car... As I just said on another post you'll find someone with whom can't tell the different from a dip stick and a dildo. Read out posts and think playing with a bunch or wires they now nothing about is good idea. 12v/700cca will give anyone a nice shock. Send you buzzed for a few hours too. On the plus side I'm sure I'll find heaps of spare parts when people start frying there elec system by not tapping someing off to have to arc out.