Abstract: An apparatus for filling lead-acid storage batteries with acid by immersion of a plurality of batteries into a tank of acid. A framework is provided over an acid tank for supporting a pivotable linkage carrying a support cradle for a number of batteries. The front and back portions of the linkage are supported by separate pairs of chains attached to a counterweight through a number of sprockets. The front support chains are driven by a motor to raise or lower the front portion of the linkage, and the back pair of chains are delayed during lowering of the linkage so that the linkage pivots to immerse and withdraw the batteries at an inclined angle into and out of the acid tank. The angle of incline of the cradle and batteries determines the level of acid which remains in the batteries after filling. The active lengths of the chain pairs are adjustable for selectively varying the angle of incline of the batteries during immersion.