PanasonicK-KJ17M3A4BA Advanced Individual Cell Battery Charger Pack with 4 AAA eneloop 2100 Cycle Rechargeable Batteries

Works great, about 90 minutes to charge

This is an excellent NiMH battery charger. You can use it with any brand of NiMH battery, and because it's a smart charger it will always charge the battery perfectly. There is a green light under each battery while charging, and the light turns off when charging is complete. The light will blink for a few seconds when the charge is checking the status of the battery, and the blinking will continue if there is a problem."Smart" chargers constantly measure the condition of the battery to determine if it's time to stop charging. There are "dumb" chargers out there that operate based on time, so they always over-charge the battery, resulting in the battery converting the excess charge to heat and damaging itself. Avoid dumb chargers.With NiMH batteries, chargers that are too fast or too slow will undercharge or overcharge the battery, while normal-speed chargers will charge the battery perfectly. This charger is a normal-speed charger. I think the speed of this charger is acceptable, as you can leave it on overnight to charge and they will be ready in the morning. However, if charge speed is important to you, don't feel bad about buying the Panasonic fast charger, because batteries are meant to be used and the batteries will still last a long time even if fast charged. Note that fast charging also makes the batteries hotter, especially towards the end of the charge cycle, and heat can damage batteries slightly (again, nothing to worry about if fast charging is important to you, just know that your batteries will not achieve the 2100 cycles if fast-charged every time). This normal-speed charger only makes the batteries slightly warm, as expected. Because this charger charges at what I consider the ideal charging speed for NiMH, I believe it is the best charger available from Panasonic.As long as you keep a supply of already-charged eneloop batteries, you won't mind waiting for batteries to charge because you can just use your already-charged batteries. White-label eneloop batteries have such low self-discharge that keeping a supply in storage won't be a problem; they will always be ready to use! For the black-label eneloop pro batteries, which have a higher self-discharge, you should probably recharge them every 1 or 2 years if you want them to be ready-to-use from storage.Use rechargeable batteries for ALL your devices! You might find a picky device that doesn't like the 1.2v to 1.4v voltage of an eneloop NiMH battery; in that case, I recommend searching Amazon for the 1.5v rechargeable lithium batteries such as TENAVOLTS or other brands. Those rechargeable lithium batteries provide a constant 1.5v, filling the gap for the few devices that an eneloop battery can't work in. That way, you will have completely switched over to rechargeable batteries!

I'm an eneloop evangelist these days because they work so well in AA and AAA flashlights, kids toys, remotes, and countless other devices around the home. The initial upfront cost seems a little steep at first, but when you start using them and realize how quickly they pay for themselves, you are going to wish you had more for everything in the home and that's how this all begins.Take a chance on them. You won't regret spending extra for the high quality eneloops. The other brands simply cannot compare.

Those batteries are durable. The charger has a strong construction. Great for emergency.

Worked well until the lights started flashing. Apparently that means it’s no longer functional.

Finally bit the bullet and bought the top rated (by every rating system I've seen) rechargables. They work beautifully, hold charge for a long time. Nothing else to say except they are pricey; but you get what you pay for.

I have a mouse that takes two AAA batteries. I hate chargers that you have to put at least 2 or all 4 in to charge.. this does individually...... and has led light.

These batteries have an incredible life. I can't remember how many recharge cycles they have been through. I have used these in trail cameras,daily, since 2018. They continue to work well. I was suspicious at first, seeing that they do not charge to 1.5 volts dc when fully charged. My suspicion was unwarranted. They perform as good as standard "AA" batteries in our cameras for many years. The cost per use is debatable.