When any of these conditions exist, it is best to take the low cells back to your shop for repairs.
When there is absolutely no indication why the cells are low, they can be cut out of the battery on discharge and put in on charge, until they come up.
The following is a good example of readings taken on a battery with a 10-ampere discharge and having four low cells, 4, 8, 11 and 16. The battery had been giving poor service, due to insufficient charging:
| Cell No. | Specific Gravity | Volts |
| 1 | 1.200 | 1.98 |
| 2 | 1.180 | 1.95 |
| 3 | 1.205 | 1.98 |
| 4 | 1.150 | 1.75 |
| 5 | 1.190 | 1.95 |
| 6 | 1.195 | 1.98 |
| 7 | 1.200 | 1.98 |
| 8 | 1.130 | 1.70 |
| 9 | 1.200 | 1.95 |
| 10 | 1.205 | 1.98 |
| 11 | 1.100 | 1.40 |
| 12 | 1.190 | 1.95 |
| 13 | 1.180 | 1.95 |
| 14 | 1.195 | 1.98 |
| 15 | 1.190 | 1.95 |
| 16 | 0.000 | zero or reversal |
The main thing to consider in checking voltage readings is the variation from the average. The average voltage readings will vary, depending on the state of charge of the battery when the readings are taken.
REPAIRS
To repair, the following equipment is necessary:
1. Portable lead burning outfit. 2. A suitable blow torch. 3. Standard sealing nut wrench. 4. File (shoemaker's rasp). 5. Pair of pliers. 6. Putty knife. 7. Pair of tin snips. 8. Wooden blocks to support elements while being worked upon. 9. Good supply of battery parts consisting of:
KXG-13 Glass jars KXG-13 Pilot jars KXG-13 Positive groups KXG-13 Negative groups KXG-13 Round rods KXG-13 Vent plugs
Sealing nuts Rubber gaskets Wood separators