Best price Energizer Rechargeable AA NiMH Batteries, 8-Count
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Energizer Rechargeable AA NiMH Batteries, 8-Count Description
Energizer AA Nickel Metal Hydride Battery NH15BP-8 Batteries
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Energizer Rechargeable AA NiMH Batteries, 8-Count Details
- Charges up to thousand times
- Best for high drain devices like digital cameras, CD players and handheld games
- Brand: Energizer
- Model: NH15BP-8
- Product Type: Electronics
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Customer Reviews
Energizer NH15BP-8 Review by Sam Fuchs "badlanders" (deary, idaho USA)
Recharge 1000 times? We have recharged these batteries 50 times at most and then they start to fall of real fast. I was surprised because I really believed they were the best way to go.
Energizer NH15BP-8 Review by A. Janjigian (Cambridge, MA USA)
I bought 20 of these on the recommendation of others. THey worked great for about 4 months, and then they stopped holding a charge. I can charge them up and leave them in my camera for a few days and it will tell me they are dead.
Energizer NiMH are no good; go with Sanyos instead, you won't be disappointed.
Energizer NH15BP-8 Review by NLee the Engineer (Nashua, NH)
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.
[Update on Oct 20, 2010]
The product image of Energizer Rechargeable AA has changed. It no longer advertises '2500mAh'. I went to my local W*mart to check out the actual batteries. All Energizer rechargable AA cells are now 2300mAh. Evidentially, Energizer has 'rollled back' battery technology to 2004. This is actually a good move because the lower capacity cells do not suffer from hideous self-discharge rate. Contrary to popular belief, a 2300mAh cell is not any less capable in delivering high power than a 2500mAh cell. Just that the run time will be about 8% shorter.
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