MH-C777PLUS-II User’s Manual
5
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
b
attery 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.”
