Eneloop Panasonic BK-3MCCA4BA AA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, 4-Battery Pack

I purchased these rechargeable batteries for my exercise bike which tends to drain AA batteries quickly, when used with a D to AA battery adapter. The batteries last long (about a month) and are rechargeable so I don’t have to worry about throwing them away and spending money again to replace the dead batteries, and can reuse them in other electronics. I can also recharge them again and move it to another device. One thing to keep in mind is that it is not 1.5 volts, it is 1.2 volts but most devices are ok with accepting 1.2 volt batteries from my personal experience. I also purchased these batteries since they don’t leak like alkaline batteries and I dealt with device damage due to alkaline batteries leaking several times. I am definitely not going back to purchasing alkaline batteries ever.

I picked up this 4 pack of Eneloop AA batteries so I could stop burning through disposables in remotes and game controllers, and they have been great so far. They come precharged, so I was able to drop them straight into my devices and start using them right away. Even after sitting in a drawer for a while, they still hold a good charge, which is one of the main reasons I prefer Eneloops over cheaper rechargeables. In regular use they last at least as long as good quality disposable AAs in things like controllers, flashlights, and wireless mice. When they finally run down, I just recharge them and put them back into rotation, instead of throwing them away and buying more. Over time that makes a big difference in both cost and convenience. If you have several AA powered gadgets around the house and want a reliable set of rechargeables you can use over and over, this 4 pack is a very solid place to start.

I have been buying rechargeable batteries since the late 70s. I'll tell you some things. Get a high quality charger. (I am using a 15 year old maha C 401fs. It now costs $44. A cheap charger will beat up your batteries and make your investment worthless. Look for individually controlled charging slots, - delta-v, temperature monitoring. I like to charge AA and AAA batteries at 500 ma. Slow charging means your batteries take more charging cycles. I see a "top review" that alleges these are "fraud batteries" because unused they drop to 1.3 volts. the opinion expressed in that review should carry little weight. It's important to remember that NIMH batteries might be chargeable to 1.5 volts but that is just "surface charge" and it will disappear with the smallest use or time. NIMH technology is rated at 1.2 volts. When you take a battery off charge and measure it immediately the voltage you are picking up the "surface charge" effect; that is the reason you can ever get a 1.5 volt measurement off nimh batteries but that's just "Surface charge" it does not represent useable power. Don't believe me? Then it's time to learn more about battery charging. I'd suggest your favorite search engine. If you use rechargeables the way I do you will spend a lot more than $4. a year on batteries so a good quality charger makes sense. 1. Candlepower forums does not sell batteries or chargers, but the folks there publish the best reviews, including technical details. 2. Eneloops whites are simply the longest lasting batteries available. Low self discharge (aka pre-charged nimh, aka LSD batteries should hold an 85% charge through a year of storage in reasonable conditions and these do. I have used them all from Eneloops to tenergy centuras to the old (no longer available) Harbor freight precharged to duracell precharged. I am lucky if any other brand takes half as many charges as eneloops. I use a 4 AAA moderately high discharge flashlight about 10 hours a week for work and that's a couple of charge cycles. Also my Oral B, and a grooming appliance are powered by AA's, along with the usual complement of low drainitems where I might use a lesser NIMH battery. I do think the price is high, but I buy white eneloops for high-use systems because they last. The black eneloops store more power but do self-discharge a bit more, and do not take as many cycles. Bottom line: bite the bullet on price, go quality and enjoy reliable, economical, low environmental burden batteries; Japanese eneloop whites are the best of breed.

I've been using Panasonic eneloop AA batteries for years and continue to be impressed with their performance. These rechargeable batteries hold a charge for a long time and can be recharged over 2,100 times, which saves a lot on disposable batteries in the long run. What I like best about the Panasonic eneloop batteries is their reliability. I use them frequently in my camera flash, remotes, and other household devices, and they continue to power my gadgets even after being unused for weeks at a time. The pre-charged feature means they are ready to go right out of the package. The eneloop batteries retain up to 70% of their charge for over 10 years when not being used. This is much better than standard rechargeable batteries that lose their charge quickly. I also appreciate that they perform well even in colder weather. It's good to know these batteries are made in Japan, which I believe contributes to their consistent quality and durability. The price is reasonable for the number of times you can recharge them. Overall, I highly recommend the Panasonic eneloop rechargeable batteries for their reliable power, long shelf life, and ability to withstand hundreds of recharge cycles. They outperform any other brand of rechargeable AA battery I've tried.

Good rechargeable batteries

Holds charge for a long time, last for a long time, never had a leak problem with them, come pre-charged. Never had an issue with them.

I haven't used them in Alaska in the winter which is why I bought them so we'll have to wait until spring to update the review. I was actually looking for a disposable lithium battery good for the extreme weather in the winter where temperatures can drop below 0 for several weeks. I am hoping this is the answer. See you in Spring. For now they're rechargeable but haven't needed to do it yet. The value for money at this time seems to be about the same as other decent rechargeable batteries.

I've started replacing high usage devices with these e.g. computer mice, closet motion lights etc, and I've been happy with their battery life.