Question

What voltage is too high for a lead acid battery?

Answer 1

For a lead-acid battery, the voltage should not exceed certain limits to prevent damage. Here's a basic guide:

1. Charging Voltage:
   

   - Bulk Charge: 14.4 to 14.8 volts (for a 12V battery).
   - Absorption Charge: 14.4 to 14.8 volts (this is where the battery is charged fully and slowly).
   - Float Charge: 13.2 to 13.8 volts (this keeps the battery topped off without overcharging it).

1. Too High Voltage:
   

   - Anything above 15 volts is considered too high for a 12V lead-acid battery during charging. At this point, the battery could overheat, lose water through excessive gassing, or even get damaged.

Important Notes:

1. Overcharging a lead-acid battery can cause the electrolyte (battery acid) to evaporate, leading to reduced capacity and shorter lifespan.
   

1. Always use a charger that is designed for lead-acid batteries to avoid overvoltage.
   

In summary, a voltage above 15V is typically too high for a 12V lead-acid battery and should be avoided.