The billing procedure (just how much voltage or existing for how long, and also what to do when billing is total, for example) depends on the dimension and kind of the battery being billed. Some battery types have high tolerance for overcharging (i.e., proceeded charging after the battery has actually been completely charged) and can be recharged by a link to a continuous voltage resource or a constant present source, depending on battery kind. Basic battery chargers of this kind need to be manually detached at the end of the charge cycle, and also some battery kinds absolutely need or might make use of a timer, to cut off charging current at some set time, around when charging is complete. Other battery types can not endure over-charging, being harmed (minimized capacity, lowered lifetime), overheating or even exploding. The battery charger might have temperature level or voltage noticing circuits and a microprocessor controller to safely adjust the charging current and voltage, figure out the state of charge, and removed at the end of charge.