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eneloop XX 2500mAh Typical / 2400 mAh Minimum, High Capacity, 4 Pack AA Ni-MH Pre-Charged Rechargeable Batteries

4.6 out of 5 stars 8,533 ratings

Price: $29.99
XX 4 Pack AA Size Chart

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Brand SANYO
Voltage 1.2 Volts
Item Dimensions LxWxH 4.49 x 3.7 x 0.61 inches
Reusability Rechargeable
Item Weight 0.29 Pounds

About this item

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  • Pre-charged and ready for immediate use
  • Can be recharged up to 500 times
  • Batteries maintain 75% of charge after 1 year of non-use
  • Provide high performance in sub-zero temperatures to -4 degrees Farenheit
  • No memory effect; a full charge every time,Nominal Voltage: 1.2 V

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Customer Rating 4.6 out of 5 stars (8533) 4.8 out of 5 stars (8692) 4.8 out of 5 stars (4066) 4.8 out of 5 stars (7365) 4.8 out of 5 stars (12009)
Price $29.99 $18.99 $27.99 $17.99 $15.89
Sold By MYBATTERYSUPPLIER Amazon.com Amazon.com Amazon.com Amazon.com
Battery Cell Composition NiMH NiMH NiMH NiMH NiMH
Size XX 4 Pack AA 8-Pack 4-Pack 4-Pack AAA

Product description

Size:XX 4 Pack AA

Product Description

The 4HR-3UWX 4-AA rechargeable battery pack utilizes SANYO's new, Double X (XX) battery Powered by eneloop which provides 2500mAh of performance for long lasting, high power capacity, extreme applications. XX batteries are the perfect choice for powering high current consuming devices such as photo strobe flash lights; providing more than twice the number of flashes per recharge in less than half the time as compared to conventional alkaline batteries!

From the Manufacturer

The 4HR-3UWX 4-AA rechargeable battery pack utilizes SANYO's new, Double X (XX) battery Powered by eneloop which provides 2500mAh of performance for long lasting, high power capacity, extreme applications. XX batteries are the perfect choice for powering high current consuming devices such as photo strobe flash lights; providing more than twice the number of flashes per recharge in less than half the time as compared to conventional alkaline batteries!

Product information

Size:XX 4 Pack AA

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4.6 out of 5 stars
4.6 out of 5
8,533 global ratings
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Top reviews from the United States

Reviewed in the United States on April 20, 2011
Size: 8 Pack AAVerified Purchase
Customer image
5.0 out of 5 stars Those are genuine second-generation eneloop cells - as far as I can tell
By NLee the Engineer on April 20, 2011
I have done extensive testing on the [[ASIN:B000LNI5VC original eneloop rechargeable batteries]] since early 2007, shortly after they were introduced in the US. I have also tested the blue second-generation eneloop cells from the [[ASIN:B003VLAEPQ Costco eneloop package]] back in 2010. But this is the first time I have seen second-gen eneloop in white wrappings being sold in the US. With so much talk about counterfeit eneloop going around, I was understandably cautious when I purchased those [[ASIN:B004UG41XW SANYO NEW 1500 eneloop 8 Pack AA Ni-MH Pre-Charged Rechargeable Batteries]].

I tested four of those cells, using my old [[ASIN:B00077AA5Q La Crosse BC-900 Battery Charger]].
- Right out of the package, their average remaining charge is 1568mAh, or nearly 80% of the rated capacity of 2000mAh. The spread is also very small, from 1558 to 1577mAh. This proves that they are indeed low-self-discharge type. (Date code on my cells says "11-01", or Jan 2011)
- After one recharge/discharge cycle, their average capacity improved to 2115mAh
- After two more recharge/discharge cycles, their average capacity leveled off at 2133mAh, or more than 6% higher than the rated capacity.

The above results are very consistent with what I have previously observed, while testing second-gen eneloop cells in the Costco package. Therefore I'm convinced that those are indeed genuine second-gen Sanyo eneloop cells. (See the scans I uploaded to Customer Images section, if you need to distinguish between old and new eneloop cells)

On the other hand, currently the prices of those new eneloop cells are about 25-50% higher than that of the original eneloop cells. So one may question: do the new eneloop cells offer sufficient improvement over the old, to justify the price different? Let's compare the following factors:

- Cycle Life: The 2nd-gen eneloop claims to "recharge up to 1500 cycles", while the original only claims 1000 cycles. This 50% improvement looks great on paper, but note that if you recharge your eneloop cells twice every week, it will take 10 years to reach 1000 cycles. So in real life, most average users will never notice the difference.

- Self-Discharge Rate: The new eneloop cells claim to "maintain 75% charge after 3 years", while the original only claims "80% after 2 years". Again, in real life most people will never notice the difference.

- Capacity: First-gen eneloop AA cells have "Typ 2000mAh, Min 1900mAh" printed on them, while 2nd-gen eneloop AA cells only say "Min 1900mAh". But in fact they have the same capacity rating of 2000mAh (typical) according to official Sanyo web site. My measured capacity numbers are actually around 2100mAh for both versions.

BOTTOM LINE:
Both the new and old eneloop cells are excellent products. You can safely mix and match them in any application, and probably nobody can tell the difference in the next 10 years. But in case you can't decide which version is a better value... Just flip a coin and pick one - you can't lose either way!

[Update on July 31, 2011]
Long term self-discharge data: I have tested a pair of new eneloop AA cells after 104 days sitting on the shelf (the batteries, not me). The average remaining charge is 88.7%. This charge-retention rate is slightly better than that of the original eneloop, but the difference is within margin of error for my experiment.

[Update on May 8, 2012]
Nowadays the 2nd-gen eneloop cells are generally priced lower than the original. So you should definitely get the newer version.

[Update on Apr 7, 2013]
Long-term self-discharge rate update: I just tested a set of 2nd-gen eneloop AA cells after two years in storage. They retained 1685mAh, or 84% of rated capacity. This is no difference from the claimed charge retention rate of 3rd-gen enellop (which says 85% after two years). See my following review on 3rd-gen eneloop:
http://www.amazon.com/review/R1Z4N7MRAH0BMX/
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3,041 people found this helpful
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Reviewed in the United States on December 20, 2018
Size: XX 4 Pack AAVerified Purchase
12 people found this helpful
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Reviewed in the United States on August 2, 2016
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Reviewed in the United States on January 8, 2021
Size: D Spacer 4 PackVerified Purchase

Top reviews from other countries

Brent L
5.0 out of 5 stars I Love this Product.
Reviewed in Canada on October 6, 2013
Size: C Spacers with 2 AAVerified Purchase
One person found this helpful
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Brent L
5.0 out of 5 stars Love em.
Reviewed in Canada on October 6, 2013
Size: D Spacers with 2 AAVerified Purchase
Ryan F
5.0 out of 5 stars Excellent
Reviewed in Canada on November 5, 2016
Size: XX 4 Pack AAVerified Purchase
Ryan F
5.0 out of 5 stars Excellent
Reviewed in Canada on November 5, 2016
Size: 4 Pack AA with ChargerVerified Purchase
Kathy c
5.0 out of 5 stars great way to have C recharegeable's without actually buying them!
Reviewed in Canada on November 29, 2014
Size: C Spacers with 2 AAVerified Purchase