On Jan 27, 11:45*am, Grant Erwin wrote:
..., I use an inexpensive car battery charger. Mine is made
by Schumacher, and has only one control, a toggle between 6 and 12 volts. It
does have an ammeter. It's a 10 amp battery charger with overtemp protection.
...
Grant Erwin

I added a surplus 3 Amp Variac to a similar Schauer charger to make a
variable power supply. The transformer will stand the 140V input,
giving 18V out which can salvage a lead-acid battery with a high-
impedance cell.

Jim Wilkins