Can You Charge A 6v Battery With A 12v Charger. If you need more you shouldnt parallel 2 12 volt batteries when you can series 2 6 volt batteries. While monitoring make sure that you are not only checking the voltage but also the general state of the battery.

The CR1s Auto Voltage Detection automatically selects battery voltage 6V or 12V and charges properly depending on the type of battery connected. If you do or plan to do any type of off-grid camping boondocking then a 6V battery bank system is a superior choice over a single 12V battery. A 6V charger wont do a thing for you.
Please make sure that both batteries should be in the same v.
A 6V Battery Bank Charging System will give you added amp hours and increased life cycles. Even a six Volt charger cant charge a 6V battery and heres why. Please make sure that both batteries should be in the same v. Using a 12-Volt Charger Safely.

