| warning | When batteries are being charged, an explosive gas forms beneath the cover of each cell. Do not smoke near batteries on charge or which have recently been charged. Do not break live circuits at the terminals of the batteries on charge. A spark will occur where the live circuit is broken. Keep all open flames away from the battery. |
Battery electrolyte temperature may temporarily be allowed to rise to 55 °C (131 °F). Increase of electrolyte temperature above 55 °C (131 °F) is harmful to the battery, causing deformation of battery cell, decrease in life of battery, etc.
CHARGE RATE
Recommended rate and time for charging completely flat battery fully is shown in the charge rate chart. When the specific gravity of electrolyte keeps 1.22 to 1.29 for more than one hour, charging should be stopped.
Charge Rate Chart
| Battery | Charging time |
| 55D23L |
| Slow charging | 5 amps 10 hours |
| 10 amps 5 hours |
| Fast charging | 20 amps 3 hours |
| 30 amps 2 hours |
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