"A-C" series chargers are new "switching" type devices which operate without the use of transformers. I.C.s control and regulate current and voltage and automatically switch from the higher fast charge voltage to the lower float voltage when batteries are very close to being fully charged. At the float voltage it is safe to leave the battery connected to the charger indefinitely, making charging pretty much fool-proof.In the fast charge mode voltage goes up to 2.45V +/ - 0.05V before switching, in the float charge mode voltage is held between 2.25- 2.30V/ cell.
