What is the difference between float charge and boost charge?

[float vs boost charge · equalise charge battery] Float is a continuous low voltage that holds a fully charged battery against self-discharge without over-charging it. Boost (or equalise) is a temporary higher voltage used to restore a discharged battery or to equalise cells that have drifted apart. Utility specifications typically set boost to initiate when battery voltage falls below a threshold. Sydney Water uses 80% of nominal, and require float to be set for minimal over-charge and water loss.