Why does a charger need temperature compensation?

[temperature compensated battery charging · why temperature compensation charger] Because the correct float voltage changes with temperature. A charger holding a 20 °C float voltage at a 45 °C battery is over-charging it, which accelerates dryout and is a recognised thermal runaway mechanism. This is now the modern standard in utility specifications: AusNet notes that only around half its existing charger fleet has the functionality and that the current standard requires it. If a bank is in an uncontrolled environment, temperature compensation is not optional.