Carmanah Technologies GPC-35-MAX 35 Amp Battery Charger

"The Go Power! Battery Chargers are compact, powerful battery
chargers that offer fast, accurate battery charging at a reasonable
cost. Using state-of-the-art, switch mode technology, Go Power!
Battery Chargers are reliable, compact and lightweight.
All models feature switchable output modes, one for float charging
and one for rapid charging, and a four-stage charger, with an
automatic "equalization" stage to periodically boost charge
batteries. This is especially useful for batteries which often sit idle
for long periods."