60A 12V DC to 12V DC Advanced Automatic Multi-Stage Battery-to-Battery Charger

Maximum charging current of target battery: 60A. It is not compatible with 24V batteries or a combination of 12V and 24V batteries. Relay signal output: 12V / 1A. Easy battery type selection: with the use of dip switches, the unit can be switched between Lead Acid, AGM, Gel, LiFePO4, or Lithium-ion battery types.

eBay