| Battery | Charging Rate |
| 5 F.P.L. | 5.0 amps. |
| 7 F.P.L. | 7.5 amps. |
| 9 F.P.L. | 10.0 amps. |
| 11 F.P.L. | 12.5 amps. |
| 13 F.P.L. | 15.0 amps. |
| 15 F.P.L. | 17.5 amps. |
Rebuilding Prest-O-Lite Farm Lighting Batteries
Opening the Cell.
1. Make sure that the cell is as fully charged as possible. Since it is not very convenient to charge a single cell, a good time to open a cell for cleaning and repairing is immediately after the battery has been given an overcharge. See page 455.
2. Disconnect the cell from the adjoining ones.
3. Heat a thin bladed putty knife and insert it under the edge of the lead-antimony cover to melt the sealing compound. Run the knife all round the cover, heating it again if it should become too cool to cut the compound readily.
4. Grasp the lead posts above the cover and lift up gradually. This will bring up the cover, plates, and separators.
5. Place the plates on a clean board for examination. Use the instructions given on pages 339 to 346. Do not keep the plates out of the electrolyte long enough to let them dry, and the negatives heat up. If you cannot examine the plates as soon as you have removed them immerse them in 1.250 acid contained in a lead or non-metallic vessel until you can examine them.
6. In renewing the electrolyte, pour in as much new 1.250 acid as there was old electrolyte in the jar. (It is assumed that the electrolyte was up to the lower ridge of the glass jar before the cell was opened.) The new electrolyte must not have a temperature above 100° when it is poured into the jar.
7. The separators can be pulled out easily when the plates are laid on their sides. All that is necessary is to remove the small rubber bridge at the bottom corners of the plates. The separators can then be pulled out. If the old separators are to be used again brush off any material that may be adhering to them, and keep them wet with 1.250 acid until they are replaced between the plates. Any separators that show cracks or holes, or that split while being replaced between the plates should be thrown away and new ones used.