4 of 4 people found the following review helpful
Small but pack a punch!,
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This review is from: Sanyo Eneloop AAA 4 Pack Batteries (Electronics)
I am a fan of the Sanyo Eneloop series of rechargeable batteries which mark themselves out from some other rechargeable cells by being close to fully charged on delivery and retaining their charge for much longer that conventional rechargeable batteries. I use the term "mark themselves out from some other rechargeable cells" because although Eneloops were amongst the first a number of other brands have launched rechargeables with similar attributes.
These AAA cells are the smallest in the Eneloop series but show considerable longevity and resilience - I use them in sensors for my weather station and a trail camera - unlike a lot of alkaline cells, in cold weather these Eneloop cells keep going (according to Sanyo down to minus 20C). They have an output of 1.2V @ 800 mAh which is enough for most uses but check the voltage and current drain of your intended application. You can now buy an Eneloop XX version of these cells which output a heftier 950 mAh if you need an extra bit of punch.
Another advantage of these cells is that they can be recharged many times before their performance begins to deteriorate noticeably. The quoted number of cycles for these particular cells is up to 1800 times, although, I suspect long before that you'll find they hold their charge less and less. I've recharged mine about 40 times so far without obvious deterioration. They're quoted as recharging to 70% of their original capacity after 5 years.
You may want to think carefully about your choice of charger - there are a range of Eneloop chargers or plenty of others too that may be more versatile. The general rule being the slower the charge the longer the cells will last in terms of the number of recharge cycles.
Finally, for those that are brand conscious, a recent development has been that Sanyo who originally owned the Eneloop name are now part of the Panasonic Group.
In summary, these are good quality rechargeable cells which retain their charge for a long time, are resilient to low temperatures and can be recharged many times over. Recommended.