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Energizer Rechargeable AA Nimh Batteries (8 Pack) | 
 enlarge | Brand: Energizer
Category: Health And Beauty
Buy New: $19.99
New (42) from $16.02
Avg. Customer Rating:  46 reviews
Media: Electronics
Autographed: No
Memorabilia: No
Number Of Items: 1
Batteries Included: No
Battery: nickel-metal-hydride
Shipping Weight (lbs): 2
Dimensions (in): 5 x 1 x 4
Legal Disclaimer: Warranty does not cover misuse of product.
MPN: NH15BP-8
Model: NH15BP-8
UPC: 039800074041
EAN: 0039800074041
Availability: Pre-Order (0-0 Business Days)
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| Features:
| • | 2450mAh | | • | 70% more power | | • | Charges up to 1,000 times | | • | Best for high-drain devices like digital cameras, CD players and handheld games | | • | Lifetime limited warranty |
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| Accessories:
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| Editorial Reviews:
Product Description
8 NiMH "AA" rechargeable batteries * each battery rated at 2500mAh *
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| Customer Reviews: Read 41 more reviews...
 Shockingly high self-discharge rate!, November 29, 2006
129 out of 136 found this review helpful
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.
 Excellent Replacement NiMH batteries October 27, 2004
39 out of 45 found this review helpful
I have three cordless Uniden phones that all have serious battery charge problems wit the original 1500 Mah batteries. I bought these (2300) and charged overnight. They work great and are the best battery out there for AA nimh required devices. Don't buy no-name garbage to save 10%, not worth damaging your electronics over it.
Not so good for digital cameras March 7, 2007
20 out of 21 found this review helpful
I gave these cells lowest possible rating because sharp decline in performance after only a few months of usage in a digital camera is not acceptable (especially considering claims on the package that these cells are GREAT for... digital cameras!). But also because much better alternatives have come on the market (e.g. Sanyo's Eneloop cells) and there simply is no reason any more to buy the Energizer 2500mAh as they have become obsolete.
I have experience using these cells for the past 2 years in 3 distinct and very different usage patterns:
1. My sister used 2 pairs in a digital camera
2. My mother used 3 pairs in a wireless mouse and keyboard
3. I used 6 pairs in various baby toys (non-motorized baby toys that play sounds and flash lights) as well as in Bluetooth keyboard/mouse and back-light IR remote control.
Because each set was never mixed with other batteries (they 'lived' in different households) - I can draw some conclusions on how these batteries hold up under varied usage conditions (by which I mean - various discharge profiles from the most intense - in digital camera - to the least intense - in IR remote controls and baby toys). Also - it's worth noting that all 3 sets of batteries were charged with identical chargers - the Maha MH-C401FS and they were ALWAYS charged on 'slow' or 'gentle' setting (around 5 hours per charge; I made sure my sister and mother understood very well to never EVER use the 'fast' 100 minute setting as it's detrimental to battery life). By the way: none of the sets got anywhere near the 1000 re-charge cycle touted on the packaging.
So what are the results of the 3 tests?
My sister, who put the most strain on her batteries in a high-drain digital camera, essentially killed her 2 sets. She still uses them - but they hardly hold charge any more.
My mother's cells still work - but they only hold sufficient charge to power her keyboard/mouse combo for about a week before they have to be recharged. Wireless keyboard / mouse is a rather low drain device though they do not have a 'sleep' function (pls see below for how this compares to a Bluetooth version).
My batteries - under the least strenuous usage of all 3 sets - held up the best. They still hold charge long enough to power any of my devices for 30 days or better. IR remote only actually drains batteries when you push buttons. Baby toys I use these cells in don't have any motors - and just like the remote control - only drain the cells when the kid presses buttons. Drain is fairly low (most of the toys simply play sounds; some also flash LED lights; none have moving parts). The Bluetooh keyboard and mouse are also low drain and unlike their 'standard' cordless brethren - they go into 'power save' or 'sleep' mode when not used for a number of minutes. This saves tremendously on power usage.
Given my experiences - the bottom line seems to be that these are OK as long as you don't plan on using them in a... digital camera. Just like other reviewers have noted - these cells are excellent in any kind of device when brand new. But after a few months of running them through their paces - they seem to kick the self discharge rate into overdrive. I hardly experienced this self discharge acceleration (though all of my cells did lose about 300mAh of capacity under my usage over the past 2 years; as tested by my newly acquired LaCrosse BC-900 charger). But both my sister and my mother definitely noticed a sharp deterioration.
However, all of this discussion is of little more than historical value at this point. 2 years ago - there were not that many other options for high capacity Ni-MH cells and these Energizer 2500mAh batteries seemed like a good idea. These days - Eneloop cells are available from Sanyo and other 'low self discharge' Ni-MH batteries are also available (often advertised as 'pre-charged' batteries; Wal Mart sells a product called Rayovac Hybrid for less than these Energizer cells; even RadioShack has a house brand; though at ridiculously high price and made in China). So I no longer see a reason to buy the Energizer 2500mAh cells - especially given that Japan-made Eneloop cells from Sanyo are only slightly more expensive. I'm in the process of replacing all of our batteries with Eneloops. Stay tuned for Eneloop review in... 2 years ;-)
Terrible Self-Discharge Rate December 12, 2006
11 out of 13 found this review helpful
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.
awesome batteries February 15, 2006
9 out of 10 found this review helpful
Like serveral below, i am using these with my Canon S2 IS. I think they are awesome. I'm very picky about battery life and i think these last great. i don't have them long enough to know if they diminish over time. I used these battery in a mini tape recorder too. It lasted over several days at 1 hour record time each day. I do have an 8 hour charger and it doesn't bother me one bit. Haven't anyone heard "faster isn't better?" I wouldn't trust the 15minute charger. who knows what it does to the battery. i am content with waiting for 8 hours and be sure my battery recieves a complete charge. I wouldn't hesitate to buy these again.
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