To charge a lead acid battery you need to limit both the current and the voltage.
The current needs to be limited to a level safe for both the charger and the battery, and the voltage needs to be limited to 13.8V (for a 12 Volt battery).
The charge current will automatically taper off as the battery voltage reaches 13.8.
The current needs to be limited to a level safe for both the charger and the battery, and the voltage needs to be limited to 13.8V (for a 12 Volt battery).
The charge current will automatically taper off as the battery voltage reaches 13.8.