Features
• Charging of 1–8 pcs of AA / AAA NiMH rechargeable batteries via battery charger(s) simultaneously
• Selectable Fast Charging, Eco Charging, Capacity Check, Conditioning, Refresh and Recovery modes for each
or all batteries simultaneously
• LCD display
• Compatible charging for any GP 4-slot NiMH USB Charger
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Exact Models: B421, M451 & P461
(B421 & M451 support charging only, P461 is required for extended function modes).
Charging instructions
Read the instruction manual thoroughly before use. Keep the manual for future reference.
1. D461: Connect the micro USB end of the USB charging cable to the Micro USB port of the charger dock (Fig. 1a).
D861: Connect the round plug of the AC wall charger to the charger dock (Fig. 1b).
2. D461: Connect the other end of the USB cable to a 2.0 A USB wall charger or other 2.0 A (or above) USB
socket (Fig. 1a).
D861: Plug the wall charger into a wall socket (Fig. 1b).
3. Insert NiMH rechargeable batteries into battery charger(s). Ensure correct polarity by matching the "+" and "–"
symbols on the battery jacket with the markings on the charger (Fig. 2).
4. Place the battery charger(s) onto the charger dock (Fig. 3).
If connected to a power source of less than 5V/2A, the charger dock may shut down. This will be indicated by
red & green flashing LEDs and an empty flashing battery icon ( ) in the display. Connect the dock to a power
source of at least 2A and reset the charger by removing and re-inserting it into the dock.
5. Repeat the steps below to customize the charging of each battery (Fig. 4a).
a. For D861 only: Press the Slot Selection button (
) to select the slot(s) (Slot A, B or ALL) (Fig. 4b).
b. Press the Battery Selection button ( ) to select up to 4 batteries in the slot.
c. Press the Function Mode button ( ) to select one of the six function modes for the selected battery/
batteries (see “Function Modes”).
d. Press the Confirmation button ( ) to confirm the selected mode and start charging.
e. During charging, press and hold the Function Mode button ( ) for about 2 seconds to edit the function
mode. After editing, press and hold the button again for about 2 seconds to continue the function program.
6. Charging will commence and the battery icons on the display will show the charging status and progress of the
batteries. Refer to Fig. 4c for charging status and Fig. 4d for charging progress.
7. Once the batteries are fully charged, remove the charger(s) from the charger dock. Remove the batteries from
the charger(s) and disconnect the charger dock from the power supply.
8. Press the Pause/Resume button ( ) to pause or resume the function mode of the selected battery/batteries.
The selected function mode will be resumed when the button is pressed again.
9. Replace the batteries if the aging icons ( ) shows on the display for that particular channel (Fig 4c (d)).
10. For charger usage instructions, please refer to the the corresponding instruction manual of GP 4-slot (B421,
M451& P461) NiMH USB Charger.
For best performance and safety, always use GP NiMH batteries.
Function modes
See below and Fig. 4e for function of each function mode. To select any of these six function modes for a specific
battery refer to the "Charging instructions" section.
a) Fast Charging Mode (Default charging mode)
This mode will automatically start after 5 seconds when a battery charger is placed in the charger dock and no
other function mode is selected (Approx. charging time for AA 2100 mAh / AAA 850 mAh batteries: 1.3–2.6 hours,
1–4 pcs).
b) Eco Charging Mode
Use this mode to optimize the NiMH battery lifespan (Approx. charging time for AA 2100 mAh / AAA 850 mAh
batteries: 4 hours).
c) Capacity Check Mode^
Use this mode to check the maximum battery capacity of a slow charging or aging battery. The process may take
10–20 hours for discharging and recharging of the battery.
d) Conditioning Mode
Use this mode to restore a battery which has been over-discharged or which has been stored for more than a year.
In this mode the charger will gently recharge the battery and display a warning ( ) in case the battery cannot
be recovered.
e) Refresh Mode^
Use this mode to discharge a battery fully and measure the charge the battery held when it was inserted. After
displaying the measurement the battery will be recharged fully. This process may take 10–20 hours.
f) Recovery Mode
Use this mode to restore the capacity of batteries that have gone through many charging cycles. This mode
involves several charge and discharge cycles and may take up to 80 hours or 3–4 days.
^
• The data from capacity measurement is only for users’ reference only, and it is recommended to use GP brand battery
with best performance.
• Capacity measurement according to GP proprietary methodology.
• Battery rated capacity marking according to international testing standard (IEC 61951-2), may be varied from device
measurement result.
• Individual battery capacity related to no. of used cycle, charging & discharging conditions in different temperature,
humidity and test method.
Usage tips
• It is normal for batteries to become hot during charging and they will gradually cool down to room
temperature after charging.
• Remove batteries from the electrical device if the device is not going to be used for a long time.
• Battery storage temperature: -25 ~ +60°C
• Charger dock operation temperature: 0 ~ +35°C
• After charging has started, press the Battery Selection button ( ) to check the status of each battery.
• If you want to replace the batteries in a battery charger during the charging process, press the Pause/
Resume button ( ) and remove the battery charger from the charger dock. After batteries are replaced,
re-insert the battery charger back in the charger dock within 2 minutes and press the Pause/Resume button
( ) to resume the previous function program. The charger dock will go to stand-by mode if no battery
charger is inserted after 2 minutes.
• The charger dock automatically turns off after it has been idle for 2 minutes. It will automatically turn on
when the slot selection button (
) or confirmation button ( ) is pressed, or when the charger is plugged
in. The charger dock will start charging after plugging in the charger.
Safety information
• This charger dock is designed to charge NiMH batteries only. Charging other batteries may lead to explosion,
battery rupture or leakage, personal injury or property damage.
• This charger dock is designed for indoor use only. Do not expose the charger dock to rain, snow or direct
sunlight.
• Do not use the charger dock in humid conditions.
• Make sure the charger dock is used between 0 ~ +35°C.
• Do not use non-rechargeable, LiFePO4, NiCD or Li-ion batteries.
• Do not use the charger dock if the plug is damaged.
• Do not use the charger dock after it has been dropped or damaged. Do not open/disassemble the charger dock.
• This charger dock is maintenance-free but should be wiped clean regularly with a dry and soft cloth. Do not
use abrasives or solvents. Unplug the charger dock before cleaning.
• This appliance can be used by children aged from 8 years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or
instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall
not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Do not dispose of electrical appliances as unsorted municipal waste, use separate collection facilities.
Contact your local government for information regarding the collection systems available. If electrical
appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwater
and get into the food chain, damaging your health and well-being.
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