Sokkia CX Series Operator's Manual page 36

6. USING THE BATTERY
• Slots 1 and 2:
• Charging lamp:
• Charging time:
26
The charger starts charging the battery mounted first. If you
place two batteries in the charger, the battery in slot 1 is
charged first, and then the battery in slot 2. (step 2)
The charging lamp is off when the charger is outside the
charging temperature range or when the battery is mounted
incorrectly. If the lamp is still off after the charger falls within
its charging temperature range and the battery is mounted
again, contact your local dealer. (steps 2 and 3)
Charging can take more than 5.5 hours when temperatures
are either especially high or low.