Secondary electrochemical systems like a sealed lead acid battery can be recharged with a DC current and thus restored to their original state of charge.

In sealed llead acid batteries the charging voltage, charging current and charge duration are optimized for a particular cell construction and service duty.

Current limited constant voltage charge

For float service duty have to be charged with a so called current limited constant voltage charging method also defined as IU charge.

In this method the charger maintains a choosen current at a constant level until the set float charge voltage is reached. Subsequently the voltage remains constant (float service) and the charging current decays to the float current level.