Lenmar R2G804U R2G 4 Hour Charger Includes USB Output with 4 R2G 2150mAh NI-MH for AA/AAA Batteries Review

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(More customer reviews)This package (Lenmar R2G804U R2G 4-Hour Charger Includes USB Output with 4 R2G 2150mAh NiMH AA Batteries looks like a very good deal, because:
1. The battery charging current is 600mA (0 to 1.5A pulsed at 40% duty cycle), which is a good compromise between 'shorter charge time' and 'longer battery lifespan'.
2. The charger has an USB output port, which can be used to power or recharge other USB devices.
3. The four included 'Ready-2-Go' AA cells have very low self-discharge rate, similar to the better-known SANYO eneloop.
However, there is one major drawback with this 4-hour charger: it can only charge in pairs. That is, you cannot recharge just a single cell, and you cannot group one AA with one AAA cell in a pair. This is very inconvenient if you have appliances that require odd number of cells. Now you are left with one cell that you cannot recharge. If you try to charge one exhausted cell together with one partially-charged cell, the charger will not stop until both cells are full. But by then, the second cell will become toasty hot due to over-charging at 600mA.
Some other minor issues you should know about this package:
1. The charger cannot recharge batteries and also power its USB port at the same time. As soon as you plug an USB device into the USB port, battery charging is terminated.
2. The USB port power is only available when the charger is plugged in to 100-240V AC. It cannot be powered using rechargeable batteries.
3. Capacity of the Lenmar Ready-2-Go AA cells is rated as '2150mAh'. But the average capacity measured, using my La Crosse BC-9009, is only 2030mAh. In contrast, most of my eneloop AA cells measured higher than rated capacity, close to 2100mAh instead.
If all your appliances use even number of rechargeable cells only, then this package is still a reasonable deal. Otherwise, consider the Duracell Mobile Charger CEF23DX2 instead. It charges cells individually, can operate using 12V car battery, and its USB port can be powered by rechargeable batteries.

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Charger, R2G, AA/AAA, 4 Hour, USB Output, w/4 R2G 2150mAh NI-MH

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