Panasonic Eneloop Pro AA Rechargeable Batteries 8-Pack - 2100 Cycles NiMH Pre-Charged with Free Battery Holder - Perfect for Cameras, Gaming Controllers & Smart Home Devices

This is the pinnacle of rechargeable AA and AAA batteries. These fourth generation eneloop 2100 batteries give performance that not only exceeds all other NiMH cells, but exceeds disposable alkaline cells as well. With a high capacity and extremely long service life, the eneloop 2100 can save you a ton of money, while also saving the environment from a ton of waste. We all need batteries, but if you want THE battery that will give you the best performance and long-term cost effectiveness, then this eneloop 4th generation 2100 is THE battery you want. It is THE battery that will perform. It is THE battery that will last.----------------------------------------A WHOLE DIFFERENT BALLGAME---OLDER NiMH BATTERIES VERSUS TODAY'S NiMH BATTERIESThese are NOT the rechargeable batteries you may remember from years past. Historically, rechargeable AA, AAA, C, D, etc. batteries have not been super practical. They did not last nearly as long as disposable alkaline, had a short service life, had terrible issues with memory, took 15+ hours to charge, quickly shrank in capacity, quickly self-discharged and were very expensive. They also did not work well in high-drain devices, and worked even worse with low-drain devices due to rapid self-discharge. In other terms, the practicality was limited and rechargeable batteries did not work well in many of our most common devices. And they got kind of a negative reputation due to this.But oh how things have changed! Second, third, and now fourth generation NiMH technology has changed everything. Energy density is much greater. Memory is gone. Charging is rapid. Service life has gone from the low hundreds to the thousands of cycles. Self-discharge has all but been eliminated. And now NiMH works especially well in high-drain devices, in many cases lasting LONGER than premium alkaline batteries. In other terms, today's rechargeable NiMH batteries are more practical than alkaline batteries, and far more economical. At the forefront of NiMH technology is Sanyo, with their eneloop brand.----------------------------------------ENELOOP (SANYO) -- THE INDUSTRY LEADER OF NiMH TECHNOLOGYEneloop (Sanyo, so technically Panasonic) is generally agreed upon to be the golden standard of NiMH technology. Their third generation NiMH batteries (often called the "eneloop 1800") were hands-down the best rechargeable cells on the market. Then they had to go improve it even more. These fourth generation cells (often called the "eneloop 2100") are amazing. Over the past 5 years of reviews, I've noted that most people benefit from rechargeable batteries, but not everyone. These fourth generation eneloop 2100's change that: everyone will benefit from these batteries. They are robust, have excellent capacity, and perform well in high-drain devices. Where these new batteries improve the most is with low-drain devices because self-discharge is so low that these give just as much run time as alkaline on even super low-drain apps (ex: clocks.) While these are among the more expensive of NiMH offerings, the higher capacity and longer service life of the fourth generation eneloop 2100 will save you significant money over cheaper NiMH cells in the long run.----------------------------------------ABOUT THE FOURTH GENERATION ENELOOP 2100 AAThese batteries are 2,000 mAh fourth generation rechargeable NiMH AAs, with an advertised service life of up to 2,100 cycles. Unlike many other brands I have used, Sanyo does not overrate their batteries. They guarantee the minimum capacity to be 1,900 mAh, and their batteries are consistently close to 2,000 mAh (by comparison, I have Tenergy and Duracell NiMH cells advertised to be 2,500 mAh but with an actual capacity of under 1,750 mAh.) This consistency in capacity translates to consistency in performance, as User Reviews of eneloop products clearly reflect.Eneloops are praised not only for having a long service life, but also for holding a high capacity throughout this service life. Eneloop states the service life of these to be up to 2,100 cycles and I believe it. My second generation eneloops have at least 600 cycles on them and still push 85%+ original capacity. My third generation eneloops have a few hundred cycles on them and still push almost 100% original capacity. Most NiMH batteries can't do this.These batteries improve from ultra-low self-discharge to ULTRA-ULTRA-low self-discharge. That is, you can charge these up and they can sit in storage for years and still keep a usable charge. Advertised as maintaining at least 70% of their charge at the 5 year mark, these practically hold their charge as well as disposable batteries. This makes the eneloop 2100 extremely practical for ultra low-drain applications that NiMH cells have historically not worked well with. Despite being suitable for these very low drain applications, these deliver equally impressive performance with high-drain applications, such as usage in a high-output flashlight. This ability to excel in both low- and high-drain applications makes the eneloop 2100 the most versatile NiMH battery ever made.Unlike older NiMH cells, these eneloops are not picky when it comes to temperature. Capable of operating in lower and higher temps, these fourth generation cells can operate down to -4 degrees. So unlike older NiMH cells, you can put these in a flashlight you leave in the car and the battery will still perform even if exposed to temperature extremes.Like other NiMH cells, these have a native voltage of 1.2v (which is lower than their top-off charge voltage.) With almost all modern devices, this does not cause any functional issues.----------------------------------------THE ENELOOP 2100 (for all applications) VERSUS THE ENELOOP PRO (for high-drain applications, formally called the XX)Eneloop has historically had two different lines: a standard/general-use NiMH battery and a high-performance NiMH battery for high-drain applications. The current fourth generation offering is the eneloop 2100 (this battery, for general-use) and the eneloop Pro (for high-performance, high-drain.) With the previous third generation, this was the eneloop 1800 (general-use) and the eneloop XX (high-performance.)The eneloop Pro is a very different type of battery than the 2100. The 2100 is a general-purpose battery that will work in almost all situations. The eneloop Pro is designed only for usage with extremely high-drain devices, and with normal and low-drain devices, it will not perform nearly as well as the eneloop 2100. The Pro has a higher 2550 mAh capacity, but only a 500 cycle lifespan. It also self-discharges more rapidly than the 2100: the eneloop Pro will discharge more in one year than the eneloop 2100 will in four years.This new eneloop 2100 is a VERY capable battery and it performs well in most high-drain applications as it is. It does considerably better with high-drain applications than the previous third generation eneloop 1800, which means these fourth generation eneloop 2100's may work well in your higher-drain device even if the eneloop 1800 did not. With a lower price, a longer service life, and lower self-discharge rate, this 2100 is more suitable for the large majority of applications, and the eneloop Pro is best used only in limited applications with devices that are unusually hard on batteries.----------------------------------------CHARGERSThese batteries require a charger that is capable of charging NiMH batteries. NiMH chargers are not generational specific (that is, the Sanyo charger you may have purchased with the third generation eneloop 1800's will charge these new fourth generation eneloop 2100's, and a charger sold with these new generation eneloop 2100's will charge eneloops of older generations.) Unless otherwise noted as being capable of charging different chemistries and/or different voltages, NiMH chargers should not be used to charge batteries of other chemistries (such as NiCad, LiFePO4, or LiMn, for example.)I have found that a good-quality charger plays a big role in getting the best performance and your money's worth with rechargeable batteries, plus it gives an added safety factor. A quality charger can inform you about battery health, capacity, and charge in a fashion that attempts to maximize service life. I also have found that the very cheap super-rapid-chargers tend to decrease battery capacity and service life, and so I would advise against them. In fact, a poor-quality super-rapid charger is probably the only thing that would harm these robust eneloops. As eneloops are not the cheapest NiMH batteries, a good charger will ensure you get the best performance and maximum useful service life from your investment.The Sanyo-branded chargers that come with some of these lots are great products. However, if you are purchasing a charger separately, I recommend considering one of the intelligent chargers that can charge batteries of different chemistries/voltages. Lithium cells have incredible energy density & are lightweight...the same lithium cell I use in my eCigerette is used to power Tesla vehicles! In the future I think we are going to see more consumer devices that use lithium cells, and so having a good quality charger that can charge both lithium and NiMH is a plus. I own a NiteCore IntelliCharger D4 that does NiCad, NiMH, LiFePO4, and LiMn/LiCo; it is one of numerous chargers praised for its performance and safety record. This has me covered for these eneloops, plus my IMR and ICR lithium cells for my eCig, plus my LiFePO4 cells for a flashlight. So this type of charger may be worth consideration.----------------------------------------CONCLUSIONEneloop's 4th generation NiMH rechargeable batteries will save you money & resources over disposable batteries, while increasing practicality & performance. These new fourth generation eneloop 2100's are the most versatile NiMH batteries made, and given they excel in both low and high drain applications, this means you can use these for virtually any need you may have. With that kind of flexibility, they run circles around other NiMH cells, and are by far the best pick for ultra low-drain applications due to an incredibly low self-discharge rate. While the initial purchase price of these are higher than other NiMH cells, the high capacity and long service life will make these less expensive to own in the long run. These batteries are fantastic and worth every penny. They will serve you well for many years and save you quite a lot of money. I highly recommend them.