If you mostly use your AA/AAA eneloop or eneloop pro batteries in low-drain devices that don't require frequent charging, BQ-CC51 is a solution with excellent cost performance. LEDs for each pair of slots light green while charging and switch off after a fixed 13-hour period, enough time for the inserted batteries to fully charge.

Insert the batteries into the slots according to the indicated polarity (+/-). When inserting a battery, you should fit the battery's negative terminal end first and then gently press the top of the battery into the slot. Pull out the positive terminal end first when removing the battery.

Note: Inserting the positive (+) terminal end of AAA batteries first may risk damaging the charger.

After checking is complete, the light above each pair of slots turns solid green to indicate that the installed batteries are being charged. If an invalid battery is inserted or a battery is installed incorrectly, the light above the affected pair of slots flashes green, and power to those slots is shut down to prevent damage to the batteries and charger.

The charger is equipped with a safety timer that shuts off power to all slots after 13 hours. The lights switch off when this period has elapsed.

Note: Charging times shown in the table are approximate and can vary depending on temperature and battery condition.