Other than that, the batteries come pre-charged. This makes them even better for the environment. What sets them apart is that they are made of 4% recycled batteries. When it comes to performance, the Energizer Rechargeable Batteries are on par with the other major brands. Pros: Made with 4% recycled batteries, pre-charged, five-year usable battery lifeĬons: More expensive than some brands that perform better The Energizer Rechargeable Batteries not only perform well, but they are also the first cells to be partially made of recycled batteries. The latest fourth-generation batteries have a 'BK' prefix in their model number, have the same capacity as older generations, and are capable of more charging cycles. Since there are differences in the various generations of Eneloop batteries, you'll want to pay attention to the model numbers and specs of each generation. The reason it wasn't his top choice was that the price tends to be more than other brands. The reviewer was particularly impressed with the AAs' ability to hold 82% of their charge capacity after sitting idle on a shelf for nine months. Wirecutter listed these batteries as runner-up. These batteries are pre-charged using solar power and can maintain 70% of their charge when left in storage for 10 years. The AA batteries have a 2,000mAh capacity with a 1,900mAh minimum, and the AAAs have 800mAh capacity with a 750mAh minimum. This is virtually impossible to test at this point since the batteries have only been on the market for about four years now, but Eneloop does have a track record of durability. What sets the Panasonic Eneloop 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries apart from other brands is the advertised 2100 cycle lifespan. Introduced in 2005 by Sanyo, Eneloop batteries are made in Japan and are in their fourth generation, the first since Panasonic bought Sanyo for $4.6 billion in 2009.

Pros: Holds charge after months of nonuse, can be recharged up to 2,100 timesĮneloop is legendary in the rechargeable battery industry. Check out our best rechargeable battery chargers.Battery Type: 2000mAH capacity, NiHM battery.The Panasonic Eneloop 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries are ideal for devices that drain your batteries on a daily basis. Learn more about how Insider Reviews tests and researches tech products. Our guide features batteries that are affordable, deliver on their capacity ratings, and will withstand hundreds of charge cycles. While researching the best rechargeable batteries, we looked at thousands of buyer and expert reviews and ratings of several brands. They rarely deliver quality and could potentially harm your devices and charger. You should avoid knockoffs and discount brands. This is why many of the experts recommend simply paying attention to the per-battery costs and going with the cheapest name-brand cell. And, most standard rechargeable AA batteries are rated for 2,000mAh and AAAs are 800mAh with slight, generally insignificant differences between brands. Just about all rechargeable AA and AAA batteries use NiMH because of its large capacity, and LSD batteries are the best because they hold the charge for longer when your device is not in use.īattery capacity is measured in milliamp hours (mAh). We also focus on nickel-metal hydride (NiMH) low self-discharge (LSD) batteries.

In fact, the Panasonic Eneloop even offers C and D spacers that make it so you can use AA batteries in devices that require C and D batteries. Many of the brands we cover also offer their batteries in C and D sizes. In our guide, we are focusing on AA and AAA batteries because these are by far the most popular rechargeable battery sizes. Plus, they're better for the environment, too.

Rechargeable batteries are more expensive than single-use batteries, but in the long run they can save you money.