MAHA MH-C777PLUS-II User Manual
MH-C777PLUS-II User’s Manual
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Thank you for purchasing the Maha MH-C777PLUS-II advanced battery
charger and analyzer. Read all directions and safety information before
operating this unit.
Table of Contents
Chapter 1: Precaution & Safety Information
P. 2
Chapter 2: Features
P. 3
Chapter 3: How to Use a Universal Charger
P. 5
Chapter 4: Connecting Power
P. 8
Chapter 5: Charging a Battery Pack
P. 10
Chapter 6: Conditioning & Analyzing a Battery Pack
P. 15
Appendix 1: Specification
P. 18
Appendix 2: Error Codes
P. 19
Appendix 3: Contacting Maha
P. 20
Appendix 4: Warranty Terms
P. 20
MH-C777PLUS-II User’s Manual
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Chapter 1: Precaution & Safety Information
Please read and observe the following precaution and safety
information while operating the MH-C777PLUS-II charger.
Only charge, condition and analyze rechargeable Lithium Ion (Li-
Ion), Lithium Polymer (Li-Po), Nickel Metal Hydride (NiMH), and
Nickel Cadmium (NiCD) chemistry battery packs. Attempts to
charge other types of battery packs may result in explosions.
Due to the unit’s rapid charging current, it is not recommended to
charge battery packs with capacity lower than 400mAh in order to
avoid overheating and possible leakage.
When powering the unit with vehicular 13.8V DC power, ensure
that the unit is not plugged in when you start your vehicle.
This unit is designed for indoor use only. Do not expose the unit to
high humidity or high temperature.
When charging a battery pack that is attached the radio, make sure
that the radio is turned off.
Always use the supplied AC adapter or cigarette lighter adapter.
The cigarette lighter adapter includes a fuse. CAUTION: for
continued protection against the risk of fire, replace only with the
same type and rating of fuse.
The charger chassis features a magnet. Since the charger is not
shielded, keep it away from computer monitors, diskettes, and other
devices that may become affected by the magnetic field.
To reduce the risk of damage to the AC adapter, pull by the
connector rather than the cord when disconnecting.
Use of an attachment not recommended by or sold by Maha may
result in a risk of fire, electric shock or injury to persons.
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Chapter 2: Features
Universal design to accommodate a wide variety of battery packs
for two-way radios, cellular phones, camcorders, and more.
Support Lithium Ion (Li-Ion), Lithium Polymer (Li-Po), Nickel Metal
Hydride (NiMH), and Nickel Cadmium (NiCD) battery packs.
Supports a wide voltage range from 1.2V to 14.4V (1 to 12 cells) for
NiMH & NiCD, and from 3.6V to 14.4V (1 to 4 cells) for Lithium Ion
and Lithium Polymer battery packs.
In addition to battery packs, the charger also supports 1 to 12 cells
of AA, AAA, C, and D rechargeable battery cells.
Intelligent microprocessor driven Negative Delta V, Zero Delta V,
and Delta Temperature detection.
Analyze and condition battery packs and digitally display capacity.
Analyze (Discharge Only Function) the battery pack to obtain the
discharged capacity of a battery pack. Information is retained on
the screen until the reset button is pressed.
Digitally display voltage, time, and capacity throughout the charge
and discharge processes.
One-Touch reset button allows the user to reset the charger without
having to disconnect power from the charger.
Include a light weight travel AC adapter (110/220V) and a car kit.
MH-C777PLUS-II User’s Manual
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Charger Diagram
Note: If you are charging individual battery cells such as AA, AAA, C or
D batteries, you must obtain an optional “battery holder” and connect it
to the external charging connector. An “alligator clip-lead cable” (P/N:
MHS-CW4) included with this charger can be used as a patch cable.
MH-C777PLUS-II User’s Manual
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Chapter 3: How to Use a Universal Charger
One of the unique features on this charger is its ability to charge a wide
array of battery packs regardless of the battery shape. This is made
possible by a pair of “floating charging contacts,” pins that can be
moved from right to left, and from top to bottom.
The following instruction provides a general step-by-step procedure that
will help you to charge many battery packs. However, be sure to
exercise common sense since every battery pack is different from one
another and may require a slightly different approach.
1. Before you start, it is important to identify which metal contacts on
the battery pack you will use. Generally, battery packs feature two
distinctive sets of contacts. The “discharging contacts” are the ones
used by your device to drain current off the battery pack. They are
generally located on the battery pack where it makes contact with
your equipment. This set of contacts is suitable for charging,
discharging, conditioning, and analyzing.
The other set of contacts, commonly known as the “drop-in
charging contacts”, are the ones designed to be used by drop-in
chargers. This set of contacts is generally found near the bottom or
at the back of your battery pack. Some of the battery packs may
feature a diode protection on the drop-in charging contacts that will
prevent proper discharging. Therefore, if you unable to charge or
discharge the battery pack using the drop-in charging contacts, you
should use the “discharging contacts” as discussed in the previous
paragraph.
2. After you have selected the set of contacts to use, you must identify
which two metal contacts out of the set to use (positive and
negative respectively). Usually, there are more than two contacts in
a set of contacts. There are two ways to find the right pair.
Voltage Meter: If you have a voltage meter, you can use it to
measure a pair of the contacts available on your battery pack.
When your meter registers a positive voltage that is close to the
rated voltage of the battery pack, you have found the right
combination.
Trial & Error: Since the charger will not respond until you have
connected its charging pins to the right pair of contacts on your
battery pack, you can use a “trial and error” method. Continue to try
different pairs of contact until the charger emits a short beep and
the LCD screen displays “QUICK CHARGE.”
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3. After you have found the right pair of contacts, you must maneuver
the “floating charging contacts” on the charger to mate securely
with your battery pack. As explained earlier, the floating charging
contacts on the charger can be moved to the left or right, top or
bottom. The diagrams below illustrate various ways to move the
contacts:
From the bottom of the charger, you can move the floating charging
contacts in various directions.
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The charger also features two “positioning guides” as illustrated
below. These guides are removable plastic parts designed to guide
the battery pack. Depending on the shape of your battery pack, you
may need to adjust these positioning guides. For large battery
packs, you may need to remove them.
The charger features a large piece of magnet in the middle of the
chassis. The magnet will hold the battery pack in place. If for some
reason your battery pack is too large to be held securely by the
magnet, you may want to use a rubber band to secure the battery
pack on to the charger.
Note 1: If you hear continuous short beeps and the LCD screen
displays “Err1”, there is a battery fault. Most likely, you have connected
the battery pack’s polarity incorrectly. To resolve this issue, flip the
“polarity switch” located in the front of the charger’s control panel.
Note 2: If you are charging a Lithium Ion or Lithium Polymer battery
pack and accidentally interrupt the charging cycle (this may occur when
you try to align the charging contacts with your battery pack), the LCD
screen will switch between rapid charging and standby even though
there is no battery pack attached. To resolve this problem, you must
reset the charger by pressing the “reset” button.
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