Supports a wide voltage range of 1.2V to 14.4V (1 to 12 cells) for NiMH & NiCD, and 3.6V to 14.4V (1 to 4 cells) for Lithium Ion. The MH-C777PLUS can charge professional digital / film SLR camera battery packs (both NiMH & Lithium Ion) like Nikon D1, D1X, D1H, D100, F5, Kodak DSC-series, Olympus E-10 / E-20, Canon EOS 1D, D30, D60. In addition to battery packs, you can also charge 1 to 12 cells of AA, AAA, C, and D rechargeable battery cells. (Requires optional battery holders)
The key to the C777PLUS' versatility are the "floating contact pins" that can be moved up, down, left and right to accomodate virtually any size or shape battery pack. Other "universal" chargers rely on the use of adapter plates which must be attached to the charger base. I've got one of those and I'm always hunting for the proper plate which is usually nowhere to be found.
Another unique feature is the magnetic base that holds the battery pack firmly in place with no clips or straps. It doesn't matter whether the battery's contacts are on the bottom or end of the pack, the C777PLUS has contact pins to mate with it. The temperature sensor probe is also attached to the battery via a magnet so changing packs is simple and quick.
Modern Lithium and NiMH packs often have two sets of contacts, one for equipment discharge and the other for charging. Charging a new and "unknown" battery only requires you to know what chemistry type it uses. There's a Li / Ni switch on the end of the charger and a polarity switch on the front. Set the Li / Ni switch to match the pack and then place it on the charger base, align the pins and then take the pack off of the pins, power up the charger and replace the pack on the pins. The charger will now analyze the pack and report if the polarity is wrong, flip the polarity switch if necessary and charging begins.
During the charge cycle the monochrome data LCD will keep you completely informed of the packs's capacity, voltage and accumulated charge time. To insure that your battery pack is safely and fully charged the C777PLUS uses a combination of Negative Delta V, Zero Delta V and temperature sensing technology. And as a complete safety backup the charger will shut off automatically after 13 hours if its still charging.
Before the charge cycle begins the C777PLUS will analyze the battery pack. It will display Error codes if the polarity is reversed, if the pack is shorted internally or if there's a dead cell in the pack. During the first three minutes the charger applies a "surface charge" to recognize the pack's voltage. After this period the timer will reset and normal quick charging will commence.
The charger is microprocessor controlled, it automatically terminates the rapid charging cycle and enters a slow trickle charge mode when the pack is fully charged. It will emit several beeps and then display "FULL" on the LCD at this point. For NiMH and NiCd type packs the maximum charge current is 800mA +/- 50mA, for lithium packs the maximum charge current is 400mA. The maximum discharge current is 300mA +/- 50mA for any battery type.
It also displays the falling voltage and capacity during a discharge (recondition) cycle. If you have a battery pack that doesn't seem to be holding a charge properly then it's probably time to completely discharge it first. NiCd packs are especially vulnerable to the "memory effect," after numerous short use and charge cycles they fail to hold a full charge. Discharging the pack safely to its lowest voltage and capacity and then fully charging can often revitalize it for many more full charge / discharge cycles.
The C777PLUS is supplied with both a 100-240 VAC power supply and a 12VDC car cord so you can use it at home or on the road. It also comes with a set of alligator clip leads so it can be attached to battery packs that won't physically fit on the charger's top deck. These clip leads also allow the use of optional battery holders for AA, AAA, C or D size cells.
If you'd like to buy one of these fine chargers then visit our friends at the Thomas Distributing web site