User guide

3 Before Going to the Field
30 Trimble M3 Total Station User Guide
Note – If a battery pack is not used for a long period, it cannot be charged to its full
capacity again. To improve the battery pack's capacity, charge and discharge it several
times. See Discharging the battery pack, page 30.
Note – You can use a battery charger with part number Q-70U/E or Q-70C to partially
charge a battery pack with part number BC-65. However, these chargers cannot fully
charge the BC-65 battery pack.
31.2 Charging the battery pack
1. Connect the power plug on the charger to an AC power outlet.
2. Connect the charging plug on the charger cable to the charging connector on
the battery pack.
The charge indicator lights up, and charging starts automatically.
When the battery pack is fully charged, the charge indicator turns off.
30.1 Discharging the battery pack
1. Connect the power plug on the charger to an AC power outlet.
2. Connect the charging plug on the charger cable to the charging connector on
the battery pack.
3. Press the Discharge button on the battery charger.
The discharge indicator lights up, and the charger starts to discharge the
battery. When discharging is completed, the discharge indicator turns off. Then
the charge indicator lights up, and charging starts automatically.
4. To stop discharging the battery pack, press the discharge button again.
Note – The battery pack can be recharged repeatedly. If you recharge the battery pack
while it still has enough power to operate the instrument, however, it will last for a shorter
period. This is called the memory effect. If you experience the memory effect, discharge the
battery pack as described above and then recharge it. This returns the battery pack to its
full capacity. Trimble recommends that you discharge the battery pack in this way at least
once every ten charges.
To AC outlet
Charge indicator
Discharge indicator
Discharge button
Air holes