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The battery manufacturer can recommend the specific gravity or voltage values for your
particular battery.
Float
When a battery becomes fully charged, dropping down to the float stage will provide a
very low rate of maintenance charging while reducing the heating and gassing of a fully
charged battery. When the battery is fully recharged, there can be no more chemical
reactions and all the charging current is turned into heat and gassing.
The purpose of float is to protect the battery from long-term overcharge. From the PWM
absorption stage, charging is dropped to the float voltage. This is typically 13.4V.