EneloopPanasonic BK-4MCCA10FA AAA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, 10-Battery Pack

I exclusively use Eneloop AA's and AAA's for alkaline battery-powered devices around the house and always keep a bunch on hand. They last a good amount of time, charge pretty quickly with the quick charger, and I have not had to replace any of them yet in the past 7 years or so of using them.Definitely recommend, especially for your wallet and the environment!

I’ve been using the Eneloop rechargeables for years since getting them at Costco way long ago. These charged up quickly and went into five Panasonic cordless phone handsets and I anticipate no problems.

I've tried other brands recently but after a few weeks, you go to use the flashlight and the batteries are dead. Never been a problem with these. I've been using this brand for many years (with a premium charger that tests, refreshes, etc) and saved a lot of money. Works great with the trail camera, too.

These were bought as additionals for my charger and extant Eneloop batteries. I've never had one fail, and they hold a charge admirably - even on the shelf. Great price, and a truly excellent product. By all means - pick these up. You won't be disappointed!

they do what they are supposed to do - and actually last quite some time

I picked these batteries because I've used the AA size and have found them to be the best NiMH batteries I've tried. The AA's hold a charge well, even in storage and last a long time. I have no reason to believe these won't be every bit as good as they are, but if I do find any problems I will post an update to this review. Again, based on my experience with the AA's from this company, they are an excellent value for the price.

I tested these on a decent Opus bt c3100. I didn't do the math, but they seemed to average about 790-820mah.I think I had one battery measure low, at around 780mah.I knocked a star off because apparently they're more like 150 cycles, not 2100:"That number (2100) is based on highly outdated protocols from 2011. In 2017, the protocol was changed to reflect real usage and that number dropped dramatically to 150. Look at the small print in the 4th Amazon slide....Can eneloop be charged up to 2,100 times?A: The estimated battery life (number of cycles) for eneloop was initially based on the test conditions specified in the IEC standard (IEC61951-2 2011, Section 7.5.4.1), suggesting up to 2,100 charging cycles. However, the IEC standard was revised in 2017 to more stringent test conditions that better reflect real-world usage. Under these updated conditions, the number of cycles is approximately 600. The actual longevity of the batteries also depends on usage patterns, as the discharge capacity gradually decreases with the number of charge cycles."Of note, higher in the Q&A, there's another entry about recharge cycles. In that one, it merely admitted that protocols have changed and the number is now less -- without mentioning the new number. Looks like they were still trying to be less than honest when they started writing the Q&A."IMO, a reputable, class-leading company, shouldn't lie or be deceitful like that.Also, in the past, I've had bad luck with Eneloop Pro AAAs.Overall it probably doesn't matter that much in real world use for me. I charge these maybe 1-2x per year, so whether they theoretically last 75 years, or 600 - I'm sure they'll deteriorate long before then.

I was happily surprised to see it came with a 24V power supply! I was expecting just a USB plug and no adapter, like in the pictures, but this setup actually works better for my needs. Haven’t connected it yet to see how it lights up, but I’m pretty happy with it so far.