Most Helpful Customer Reviews
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285 of 293 people found the following review helpful:
1.0 out of 5 stars
Shockingly high self-discharge rate!, November 29, 2006
All rechargeable battery manufacturers love to boast about their product's current capacity (mAh). But there is a dirty little secret that they don't want you to hear: self-discharge rate. Simply put: a fully charged NiCd or NiMH cell will gradually lose its stored energy over time. Technical papers I have researched typically put the self-discharge rate at 10-20% per month for NiCd cells, and 20-30% per month for NiMH cells. This kind of self-discharge rate is usually acceptable in applications such as digital cameras.
I bought 8 of those Energizer 2500mAh rechargeable NiMH batteries over one year ago. At first, I was very happy about the large current capacity offered by those batteries. But within a few months, I started to notice that they die very quickly in my digital camera. In fact, a set of Sony 2300mAh NiMH batteries I bought one year earlier seems to last much longer when used in the same camera.
I recently did some controlled experiments (using the LaCrosse BC-900 AlphaPower Battery Charger) and found out what's wrong: The Energizer NiMH batteries have very high self-discharge rate. After fully charging all 8 cells and left them on the shelf for one week, five of them lost over 30% of their charge, and the other three lost about 20%. In comparison, the set of older Sony batteries only lost around 10% over the same one-week period.
So what this really means is: if I charge up those Energizer 2500mAh batteries and leave them in my camera for three weeks, they will become totally exhausted. I found this kind of self-discharge rate completely unacceptable, therefore I strongly advise against buying those batteries.
[Update on April 9, 2007]
I have hardly used those Energizer 2500mAh cells in the last few month. Now they have deteriorated even further. Five of them can't even hold their charges for more then a day.
Instead of the Energizer 2500mAh cells, I recommend buying the Rayovac "Hybrid" 2100mAh cells. They have very low self-discharge rate (see my review on "RAYO 4PK AA") and are cheaper than the better-known Sanyo eneloop 2000mAh cells. Kodak also sells a "Pre-Charged" NiMH cell with exactly the same spec as the Rayovac Hybrid.
The bottom line: Low-Self-Discharge NiMH cells are your best choices. There is absolutely no point in taking chances with older generation 2500-2700mAh NiMH cells now.
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140 of 156 people found the following review helpful:
4.0 out of 5 stars
Shockingly good performance, March 16, 2000
I bought a bunch of Energizer's AA ACCU NiMH rechargeable batteries to power a halogen bicycle light and LEGO Mindstorms robots. Their performance has exceeded my expectations.The bicycle light seems as bright as it ever was with alkaline batteries, affording good visibility during night time cycling. And stopping play---er, experimentation---with the LEGO robots for recharging has yet to be a problem. However, I do have to issue this warning: these batteries are slightly fatter than standard AA batteries. I tried using them in a Mini Mag Light. After I got one battery in the light's barrel, I realized---too late---that I'd never get the batteries back out. I ended up destroying the Mini Mag Light in order to retrieve the batteries. If your application is cramped for space, beware! If they do fit, expect good energy for a good long time.
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66 of 72 people found the following review helpful:
5.0 out of 5 stars
Great batteries, February 24, 2006
I used to buy excellent Maha rechargable batteries, but finally Energizer attracted my attention. Great price, great capacity. After about 20 recharges batteries are strong and do not show any signs of problems.
I use them in old, power hungry and very demanding Olympus E-10 camera. It is known to draw up to one amper of current and to declare batteries empty as far as their voltage goes slightly below 1.2 volts. Considering number of pictures I can take comparing to Maha 2100 MAh batteries, I can say Energizer is very strong performer and 2500MAh is not just a number.
Some users complained about very bad performance for Energizer.
There could be couple things to consider:
- make sure you have decent charger: many high capacity NiMh batteries can be destroyed easily with cheap (<$20) charger - overheat and overcharge are usual suspects
- some devices expect 1.5 volts, not 1.2 that all NiMh normally deliver; in general freshly charged good set of NiMh has voltage around 1.4 volts - but it goes down very fast to 1.2 v and stays there until batteries are nearly empty. Most modern cameras have "cut off" voltage set to 1.1 v
Update on Feb 7, 2007
I should mention that 4 out of my 12 Energizer batteries suddenly stopped to work. Surprisingly these are four spares I have not used much. I suspect that these batteries may develop a problem if left uncharged for prolonged period of time. For now I have bought Sanyo slow discharge Eneloop batteries (available at Amazon) as a replacement.
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