Maha MH-C777 Universal Charger /
Conditioner Frequently Asked Questions:
|
Primary Sensor
Function |
-dV (Negative
Delta V) & dT
(Delta Temp.) |
|
Rapid
Charge Rate |
650mAh |
|
Trickle
Charge Rate |
40mA |
|
Discharge
Rate |
400mA |
|
Voltage
Supported |
4.8V, 6V, 7.2V,
8.4V, 9.6V, 12V
Auto voltage sensing. |
|
Overcharge
Protection |
Safety
Timer |
|
Charge Time
|
Charge
listed battery packs with-in 1hour to 3
hours |
Frequently Asked Questions
Q:
I am
having trouble conditioning/discharging my
battery pack. The green LED only shows for a few
seconds and then goes back to the charging mode.
Is there something wrong with the charger?
No. This is a very common difficulty. Some modern
battery packs feature a diode protection at the
"charging contacts", the metal contacts
usually located at the bottom or back of the
battery pack for drop-in chargers. The diode
protection will prevent the drawing of power and
thus hinder the conditioning sequence. To solve
this problem, simply switch to the "radio
contacts" (the metal contacts located
usually at the top or front of the battery pack
for radio use). The radio contact can be used for
both charging and discharging.
Q: My battery pack features more than two
sets of contacts. How do I distinguish the
positive from the ground?
First, check the "scale system diagram"
at the back of your manual. It tells you the pin
position relative to the scale behind. If your
battery pack is not listed, then some
trial-and-error is required. The best tool to do
this is a digital multimeter. When you get a
high, positive voltage, then you have found the
right contacts. However, if you cannot find any
significant voltage, then your battery packs
voltage reading is blocked the one-way diode. The
charger, on the other hand, has the ability to
determine contacts, even though your meter cannot
read it. Simply try different combination of
contacts on your battery pack with the charging
pins. When the appropriate contacts are located,
the charger would initiate the charging sequence.
Q: The charger seems to charge in a few
minutes, and the initial voltage indication shows
a lower voltage Is something wrong with the
charger?
This problem is usually caused by the battery
pack. This situation occurs when your battery
pack is "over-discharged", meaning you
have drawn power from the battery pack too long.
To temporarily solve this problem, you can charge
first for about 10 minutes. Then, remove the
battery pack and put is back again. To solve the
source of the problem, observe the following.
Most modern radios have low voltage protection.
When the proper indication shows on the radio,
remove the battery pack immediately in order to
charge and preserve long life for your battery
pack.
Q: I have a "battery case" that
consists of 4 to 6 rechargeable AA NiCD/NiMH
battery cells. Can I charge via the MH-C777?
Although the MH-C777 is not designed particularly
for charging individual battery cells, this can
be accomplished. First of all, it is recommended
that you obtain a clip-lead, part number MHS-CW4,
that can interface with the charger and your
battery case. When charging, make sure all
batteries are in equal state. This means they
must be the same model, brand, capacity,
chemistry, and voltage. A mix cell may cause
extreme damage. In addition, in order to prolong
the life of your battery cells, charge batteries
from the same electronic device. Another words,
do not mix two batteries from your remote
control, another two from a toy, and another two
from your radio. They must be in equal state. In
addition, the conditioning feature is suggested
in this arrangement.
Q: Is there anyway, using the MH-C777, to
analyze the capacity of the battery pack?
Yes! Although the MH-C777 does not feature a
capacity display feature, you can find it
mathematically. The charger's discharge current
is about 400mA +/- 50mA. So measure the discharge
current first. Then, count the total hours
required to discharge the battery pack. Finally,
multiply that by the initial charging current.
For example, you discharged a battery pack at
400mA for 3 hours. This would indicate a capacity
of 1200mA.
Basic Features
Q: The MH-C777 beeps continuously whenever I
insert my battery pack. What should I do?
The continuous beep indicates a reverse polarity
on the charger. Simply flip the "polarity
switch" and reinsert battery pack to
reinitialize charging sequence.
Q: What particular lighting arrangement
would indicate a full charge?
When the charge is completed, you will hear a
long beep. In addition, the indicator should only
show the rightmost red LED.
Q: When I discharge my battery pack, the
charger becomes very hot. Is this normal?
Yes. While discharging the internal load is
absorbing all energies and eventually released as
heat. Between discharge / charge cycles, allow
sufficient time for cooling.
Q: What is the warranty?
This product is covered by Maha's One Year
Limited Warranty.
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MH-C777 Universal Charger / Conditioner
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