1. Float Charging Voltage:
   The float charging voltage is set at a lower level, usually between 13.2 to 13.8 volts, to maintain the battery’s full state of charge without overcharging. This setting is essential for keeping lead-acid batteries in a ready-to-use state, especially in applications where they are not frequently used.

2. Temperature Compensation:
   Temperature compensation adjusts the charging voltage based on ambient temperature changes. As temperatures rise, the charging voltage should be decreased to prevent overcharging. Conversely, the voltage should be increased in colder conditions. This ensures optimal battery performance and longevity.

The recommended voltage for float charging lead-acid batteries is typically between 2.2 to 2.3 volts per cell. This charging method maintains the battery at a fully charged state without overcharging, ensuring longevity and optimal performance.