Charge 4 AA or 4 AAA batteries easily with this Panasonic eneloop K-KJ17MCA4BA battery charger, which features an LED display with 4 indicator lights to let you monitor the status of each battery. Four included eneloop AA batteries offer immediate use.
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This is a great charger/battery pack for use in toys, remotes, or video game controllers (Xbox/Wii). This pack contains 4x AA batteries, but the charger can also accept AAA.
It has one of the best Low Self Discharge rechargeable batteries. The batteries are Made in Japan, so they're of the best quality.
The charger is of the smart variety and it uses a trickle/pulse method. It charges and senses each individual battery's level, so no need to charge in pairs. You can charge as few or as many as you want at a time, and mix&match sizes, too. There's a small green light under each battery that shows when it's charging, and automatically turns off when it's done.
The downside is it's a bit slow as it takes about 7 hours to fully charge a completely depleted battery. Although, slow charging is good to extend the life of a battery.