By the foregoing methods you should be able to determine what is to be done. The following rules should also help:
Cleaning and renewal of electrolyte is necessary when:
(a) Sediment has risen to within one-half inch of the bottom of the plates.
(b) Much foreign material is floating in the electrolyte, or electrolyte is of a deep brown color.
Replacement of parts is necessary when
(a) Separators are cracked or warped. See page 346 for Separator troubles.
(b) Plates are defective. See rules on pages 339 to 346.
PREST-O-LITE FARM LIGHTING BATTERIES
The Prest-O-Lite battery which is designed for use in connection with farm lighting plants is known as the FPL type. Cells of 7, 9, 11, 13 and 15 plates are made, the number of plates being indicated by putting the figure in front of the type letters. A seven plate cell is thus designated as a 7 FPL cell, which has an 80 ampere hour capacity at the 8 hour continuous discharge rate.