Mastervolt 83302502 Charge Mate 2502

A secondary battery is becoming increasingly common.
As a second battery can prevent the main battery from depleting and being unable to start, this seems like a safe and reliable solution.
The second battery, however, also has to be charged regularly.
The Charge Mate series connects both batteries during charging and keeps them isolated when discharging.
The Charge Mate 1202 and 2502 are especially practical for small systems.