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SANYO eneloop 4 Pack AA NiMH Pre-Charged Rechargeable Batteries | 
| Brand: Sanyo
List Price: $19.95
Buy New: $6.74
You Save: $13.21 (66%)
New (38)
Rating:  405 reviews
Color: white
Media: Electronics
Shipping Weight (lbs): 0.3
Dimensions (in): 2.3 x 0.5 x 2
Legal Disclaimer: Warranty does not cover misuse of product.
MPN: SEC-HR3UTG-4BP
Model: SEC-HR3UTG-4BP
UPC: 043712119035
EAN: 0043168976466
ASIN: B000IV2WAW
Availability: Usually ships in 1-2 business days
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| Features:
| • | 4-pack of 2,000 mAh rechargeable AA batteries for digital cameras, remotes, and more | | • | Pre-charged and ready to use right out of the pack; preserves charge for long periods of time | | • | Extremely slow self-discharge rate maintains 85 percent of capacity after 1 year of storage | | • | Combines best features of AA alkaline (ready for use) and rechargeable (reusable) batteries | | • | Can be charged up to 1,000 times (including partially) without experiencing memory effect |
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| Editorial Reviews:
Product Description
eneloop is a new type of battery, which satisfies your needs and expectation in an unique way. This battery can be used right after purchasing, has a high performance, has a long shelf life with no loss of energy, can be used everywhere, environmentally friendly and easy to use. Unlike disposable batteries which can only be used once and wasteful, eneloop batteries can be recharged replacing 1000 disposable batteries.
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| Customer Reviews: Read 400 more reviews...
 LSD is great.... just keep away from heat! January 9, 2007
NLee the Engineer (Nashua, NH)
607 out of 618 found this review helpful
According to Sanyo, the new eneloop LSD (low self-discharge) NiMH batteries can maintain 85% of its original charge after 1 year of storage. This claim is slightly misleading, because it is based on simulation test at 20 degree C. At higher temperature, the self-discharge rate is likely to be much higher.
I have tested five of those AA cells (details are given in my review for the eneloop 4-pack). The average energy loss is about 26% after less than 6 months of storage. This self-discharge rate is about 3 times higher than what Sanyo claimed. However, it is still 6 times lower than that of ordinary NiMH batteries. Therefore I'm in the process of replacing most of my existing rechargeable cells to the Sanyo eneloop.
This 8-pack Sanyo eneloop LSD batteries is a better value than two 4-pack. Thanks to lower self-discharge rate, you'll discover a lot more applications for eneloop cells in your house, such as in clocks, remote controls and smoke detectors.
But please, don't use them as emergency flash lights batteries in your car, because the higher temperature during summer time will probably nullify the advantage of LSD.
[Update on Jan 13, 2007]
I have tested six new eneloop AAA cells, dated "2006-06'. The average residue charge is 589mAh, and the freshly charged capacity is 827mAh. This implies a self-discharge rate of 29% in 7 months, which is consistent with the rate for AA cells (26% loss in 6 months).
[Update on Jan 29, 2007]
The Rayovac "Hybrid" rechargeable NiMH batteries are now available at Walmart, priced at only $[...] for 4-pack of AA or AAA cells. It is also advertised to have low self-discharge rate, but not as low as that for eneloop. The eneloop is supposed to retain 85% charge in 12 months (when stored at 20 degree C), whereas Hybrid is supposed to retain 80% charge in 6 months (no mention of temperature).
[Update on June 3, 2007]
In my 2-month self-discharge test using four different brands of NiMH cells. Hybrid and eneloop came up neck-and-neck!
Room temperature: 60-62 degree F (16-17 degree C). All capacities measured are average of 2-cells.
- Sanyo eneloop 2000, purchased Jan 2007.
Initial capacity measured: 2070mAh
Capacity after 62 days: 1796mAh (-13.2%)
(Note: my previous result for eneloop showed -18%, but I repeated the test and it did better this time)
- Rayovac Hybrid 2100, purchased Jan 2007.
Initial capacity measured: 2155mAh
Capacity after 62 days: 1859mAh (-13.8%)
- LaCrosse 2000, purchased Jan 2006.
Initial capacity measured: 1902mAh
Capacity after 62 days: 1417mAh (-26%)
- SONY 2300, purchased Sep 2004.
Initial capacity measured: 2210mAh
Capacity after 62 days: 1309mAh (-41%)
So neither eneloop nor Hybrid did as well as advertised, but they are still significantly better than previous generation of NiMH cells. So you can't go wrong with either brand.
The News of LSD Has Been Slightly Exaggerated January 6, 2007
NLee the Engineer (Nashua, NH)
183 out of 191 found this review helpful
I was really excited when I first heard about the Sanyo eneloop LSD (low self-discharge] NiMH batteries. The promise to "maintain 85% of original charge after one year" sounds amazing. However, after reading Sanyo's Nov 2005 press release carefully, I learned that the claim is actually based on "simulation test when stored at room temperature of 20 degree C".
The rechargeable battery is an electrochemical device. Since most chemical reactions happen faster at elevated temperature, it is reasonable to expect the self-discharge rate of the eneloop to be also faster at higher tempeature. The question is: by how much? The following is my experiment:
I purchased two eneloop AA 4-pack on Jan 3rd. The packages were dated "2006-07", which means they were probably last charged in the factor nearly six months ago. The initial voltage is 1.31V for all cells. I then tested a total of five AA cells using the "Discharge/Refresh" mode on my LaCrosse BC-900 charger.
The first discharge cycle (at 250mA) yields the residue charge in those cells. The average of five cells came out to be 1476mAh. The spread is between 1388mAh and 1531mAh.
Next, the cells were fully recharged (at 500mA) and discharged again. The second discharge cycle yields the freshly charged capacity. Amazingly, the numbers all came out to be within 1-2% of rated capacity of 2000mAh.
Therefore on average, those five eneloop AA cells I tested have lost 26% of their original charge after nearly 6 months of storage. This rate of energy loss is about three times higher than what Sanyo advertised. However, it is important to point out that a typical NiMH cells will lose around 30% of is original charge within one month (Some brands, such as the Energizer 2500mAh, will loss 30% in one week). So the self-discharge rate of eneloop is still 6-7 times slower. Just remeber that they are best stored at temperature of 20 degree C or lower, if you hope to get the advertised self-discharge rate.
[Update on June 3, 2007]
In my 2-month self-discharge test using four different brands of NiMH cells. Hybrid and eneloop came up neck-and-neck!
Room temperature: 60-62 degree F (16-17 degree C). All capacities measured are average of 2-cells.
- Sanyo eneloop 2000, purchased Jan 2007.
Initial capacity measured: 2070mAh
Capacity after 62 days: 1796mAh (-13.2%)
(Note: my previous result for eneloop showed -18%, but I repeated the test and it did better this time)
- Rayovac Hybrid 2100, purchased Jan 2007.
Initial capacity measured: 2155mAh
Capacity after 62 days: 1859mAh (-13.8%)
- LaCrosse 2000, purchased Jan 2006.
Initial capacity measured: 1902mAh
Capacity after 62 days: 1417mAh (-26%)
- SONY 2300, purchased Sep 2004.
Initial capacity measured: 2210mAh
Capacity after 62 days: 1309mAh (-41%)
So neither eneloop nor Hybrid did as well as advertised, but they are still significantly better than previous generation of NiMH cells. So you can't go wrong with either brand.
Finally, a high capacity rechargable that holds its charge December 30, 2006
Dolan Halbrook (San Francisco, CA)
42 out of 47 found this review helpful
Funny, everyone seems so thrilled about how they come charged out of the box. While this is nice and convenient, the bigger picture is *why* they can come charged out of the box: they discharge at a much slower rate than normal (NiMH) rechargeable batteries. If you use your battery-needing product often, you may not notice this, but for things you use sporadically, this is a godsend. No more coming home from vacation to find your TV remote control is dead. No more grabbing your digital camera after three weeks of not using it only to find it won't start up.
These batteries are, indeed, the best of both worlds: they have the power and reuse advantages of a good NiMH battery, but the slow steady discharge of an Alkaline disposable. Look no further -- this is the rechargeable you've been waiting for.
And if you had to guess, I'm happy with my first set and about to order more... :)
After all It is not only about milliampere hours March 12, 2007
Vlad G (Boston, USA)
41 out of 41 found this review helpful
I received several sets of Eneloops in February and label told they were produced in April - so they sat at warehouse for nine month. I put them into camera and they worked just fine. Kudos Sanyo!
I should also mention that Sanyo includes reusable battery holders with each set of four. These holders do not look very sturdy, but they perfectly usable.
Technically, Sanyo solved the main problem with NiMh technology - frightening self-discharge rate (up to 40% a month for standard cells). By doing this Sanyo reduced cell capacity down to 2000 mAh from today's top line of 2700 mAh.
Simple calculation shows that due to self-discharge a good 2700 mAh battery holds only around 2000 mAh after a month and a half.
So the answer to the question "which battery is better - Eneloop or standard NiMh" - lies in the usage pattern.
If you always keep batteries in your camera in top-notch charged condition, then standard 2700 mAh set is a winner. For occasional shooters who always forget to charge batteries (like me), Eneloop makes lot of sense because in three month I get around 1900 mAh out of Eneloop and only 1400 mAh from the standard cell. So Eneloop is a winner for everyone who keep batteries inside the camera or any other device for more than 6 weeks.
And, well, if paragraph above looks too technical with too many details and numbers - then Eneloop is a clear winner too, because it just behaves the way battery should behave - without forcing users to know how it works.
This observation made me buy additional sets of AAA Eneloops to use in my wireless mouse, keyboard, voice recorder and LCD flashlight. It should be taken into account that Eneloops are four times more expensive than Alkaline cells, so it is reasonable to use them for devices that require fresh batteries at least twice a year.
 A SACRIFICE of capacity and performance for charge holding time November 12, 2007
HMMWV (santa clara, CA USA)
36 out of 63 found this review helpful
This is a well designed and well intended concept, unfortunately it's an in-between product and not an exact replacement for modern (2700 mAh) NiMH cells due to design limitations of the long term storage hybrid batteries.
First, most rechargable users have already become accustomed to charging their batteries RIGHT before use (and not letting them sit for months - that's the role for lithium cells) Most advanced chargers keep cells fresh using a trickle charge so they can be kept at their peak by leaving them in the charger.
Second, at 90% of 2000 mAh, we're now sitting at 1800 mAh. State of the art Sanyo "normal" Ni-MH cells fresh from the charger are 2700 mAh. So these batteries at one month are almost a full amp hour behind a freshly charged set of regular NiMH cells.
Finally, the eneloop cell's internal impedance is higher than the conventional NiMH cell. The result is poorer performance in the product - be that a dimmer flashlight, slower focus in the camera, or longer flash cycle times compared to NiMH typical performance.
As an in-between product, they have a few practical uses. I might consider using them in my image stabilized binoculars because they sit for a long time between usage, however I've learned to keep a set of AA lithium cells in the case should my NiMH die. I would NOT use these in a camera flash as I want maximum current, maximum voltage, and maximum capacity in that application, where NiMH outperform alkaline cells.
Purchase the state of the art in normal NiMH cells at 2700 mAh and you're nearly 1 amp hour ahead after charging them. The next generation of state of the art NiMH cells is expected to debut at 3000 mAh on the market very soon (a few months from now).
So it all boils down to a trade off. Long term storage or maximum performance. Maybe a mix of both is needed sometimes, but realize you are sacrificing one for the other.
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