Charge storage batteries.
What does a Battery Charger do?
Charges storage batteries: Groups batteries on tables according to type and specified rate and length of charge. Attaches positive lead wire from current source to positive post and negative lead wire to negative post of group. Starts charge and reads ammeter and adjusts rheostat to obtain specified charging rate. Records data indicating location, type, and number of batteries on circuit and rate and length of charge specified. Marks ends of tables with chalk indicating when batteries are to be disconnected and removed. May ascertain specific gravity of acid in batteries during charge, using hydrometer and thermometer and notify ACID ADJUSTER to correct variation. May record instrument readings during charging cycle and regulate current.