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(More customer reviews)Despite what the name may suggest, this eneloop USB Charger (2 AA) can be used to recharge any brand of NiMH cells - not just eneloop. It can also recharge 1-2 AAA cells - not just AA. It is a 'smart' charger that monitors the status of each cell independently, so there is no danger of over-charging the cell.
Unlike a stand-alone charger which needs to be connected to an AC outlet, this charger (MDU01S) draws its power from the USB port of your laptop or PC. That's why it can be made so tiny, and you never have to search for yet another AC outlet. The down-side is that: since the power available from an USB port is limited, its charging current is relatively low. If you put just one AA cell in it, the charging current is 850mA. That means it takes about 2.5 hours to fully recharge one 2000mAh eneloop cell. But if you put two cells in it, the current drops to 450mA each. So now it takes nearly 5 hours to fully recharge 2 eneloop AA cells.
One physical limitation of this charger is that: in order to recharge AAA cells, you have to flip the positive (+) terminal down. That makes it impossible to recharge one AA and one AAA at the same time.
Another concern is that: once your laptop goes into low-power standby or 'sleep' mode, its USB ports may be turned off, which means the charger will also stop working.
If, like me, you always travel with your laptop computer, then the MDU01S makes a very nice travel charger. Otherwise, you may want to consider the Sanyo eneloop MDR02 as a stand-alone travel charger.
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Main features:Compact and easy to carry. The USB cable can be compactly stored inside of the charger after use.Able to be charged from a USB port on personal computers and other compatible electronic devices.Rapid charge for one or two AA and AAA size "eneloop" batteries. (For one battery, the charging speed is doubled.) Pre-charged Ni-MH rechargeable battery kitEconomical: 1 eneloop = 1,000 alkaline batteriesConvenient: eneloop batteries are pre-charged and ready to use when you are
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