For rechargeable batteries set "ACCU Auto \ & ƒ"-mode (see User Manual: 9. Power Control Section). With this setup the powerMONITOR verifies the current battery status and starts with the charging procedure if required. The battery will be frequently discharged and recharged which extends battery lifetime.
In case of required instant charging adjust the powerMONITOR according section 8 "Battery Status / Instant Charging" in the user manual.