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Panasonic BK-3MCCA8BA eneloop AA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, 8 Pack
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- Recharge up to 2100 times
- Maintain up to 70% of their charge after 10 years (when not it use)
- 2000mAh type, 1900mAh min, Ni-MH pre-charged rechargeable battery
- Pre-Charged at the factory using solar power and ready to use
- No memory effect - batteries can be recharged when fully, or partially discharged
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AmazonBasics AA High-Capacity Rechargeable Batteries, 4 or 8 PackShop now
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From the manufacturer
eneloop Ready to Use Rechargeable Battery
Batteries can be recharged when fully, or partially drained. *eneloop charge capacity and mAh estimates based on Panasonic internal IEC 61951-2(7.3.2) testing. **Recharge cycles based on testing method established by IEC 61951-2(188.8.131.52). ***Solar energy charging as certified by The Green Energy Certification Center. eneloop batteries need a charger to be recharged. Panasonic Ni-MH battery chargers are recommended. ****Recommended storage conditions 68 degrees F. Results may vary based on conditions of storage and use.
Ready to Use Ni-MH Rechargeable Batteries
eneloop Ni-MH 'Low Self Discharge' batteries utilize Panasonic’s advanced rechargeable cell technology allowing them to be recharged up to 2100 times.** These battery cells are ideal for all household products including flashlights, wireless gaming devices, digital camera flash units, and wireless mouse and keyboards.
- Recharge up to 2100 times**
- Maintain 70% charge for up to 10 years*
- Up to 2000mAh* (AA) / 800mAh* (AAA)
- Pre-charged using solar power***
- Temperature performance down to -4 F****
eneloop 2100 cycle rechargeable Ni-MH batteries maintain 70% of their charge for up to 10 years (when not in use and stored properly).*
Improvements to the conductive surface layer of the active (positive) electrode material (made primarily from nickel-metal hydride) produce greater conductivity and durability. Limiting the degradation of the conductive layer increases the number of times that eneloop batteries can be recharged. ..up to 2100 times.**
eneloop’s unique "Clean Energy Loop" initiative is a reality. All eneloop and eneloop pro batteries are pre-charged at the factory in Japan using power generated from solar energy.*** This process is certified twice a year by The Green Energy Certification Center.
Keep your tactical flashlights, walkie-talkie radios, battery powered lanterns, cameras and other devices powered in the winter. eneloop and eneloop pro batteries deliver exceptional performance at extreme low temperatures, down to –4 degree Fahrenheit.****
|eneloop AA||eneloop AAA||eneloop pro AA||eneloop pro AAA|
|Capacity||up to 2000mAh*||up to 800mAh*||up to 2550mAh*||up to 950mAh*|
|Cycles / Recharges||up to 2100 times**||up to 2100 times**||up to 500 times**||up to 500 times**|
|Storage Life||Hold 70% charge up to 10 years*||Hold 70% charge up to 10 years*||Holds 85% charge up to one year*||Holds 85% charge up to one year*|
|Charged at the Factory Using Solar Power||Yes||Yes||Yes||Yes|
|Low Temp Rating||Down to -4 degrees F||Down to -4 degrees F||Down to -4 degrees F||Down to -4 degrees F|
|Chemistry||LSD Ni-MH||LSD Ni-MH||LSD Ni-MH||LSD Ni-MH|
|Country of Origin||Made in Japan||Made in Japan||Made in Japan||Made in Japan|
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|Shipping||FREE Shipping||FREE Shipping||FREE Shipping||FREE Shipping||FREE Shipping||FREE Shipping|
|Battery Cell Type||NiMh||NiMh||NiMh||NiMh||NiMh||Alkaline|
|Item Dimensions||3.38 x 1.2 x 4.25 in||2 x 4.57 x 0.57 in||1.99 x 4.6 x 0.57 in||1.2 x 3.38 x 4.25 in||1.97 x 9.12 x 0.57 in||3.69 x 4.51 x 1.16 in|
|Size||8-Pack||AA 8 Pack||AA 8 Pack||8-Pack||AA 16 Pack||8 Count|
eneloop NiMH "Low Self Discharge" batteries utilize Panasonic advanced rechargeable battery technology, allowing them to be recharged up to 2,100 times. eneloop batteries deliver consistent power performance, maintain 70% of their charge for up to 10 years, come pre-charged by solar power (at the factory) and are ready to use out of the package. They also have extreme temperature performance down to -4 deg F.
Top customer reviews
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Standard Eneloop models:
1st Generation Eneloop model numbers and specs
AAA: HR-4UTG 1000cycles Rated 800mAh. Min. 750mAh
....AA: HR-3UTG 1000cycles Rated 2,000mAh. Min. 1,900mAh
.......C: HR-2UTG 1000cycles Rated 3,200mAh. Min. 3,000mAh
.......D: HR-1UTG 1000cycles Rated 6,000mAh. Min. 5,700mAh
2nd Generation Eneloop model numbers and specs
AAA: HR-4UTGA 1500cycles Rated 800mAh. Min. 750mAh
...AA: HR-3UTGA 1500cycles Rated 2,000mAh. Min. 1,900mAh
3rd Generation Eneloop model numbers and specs
AAA: HR-4UTGB 1800cycles Rated 800mAh. Min 750mAh
...AA: HR-3UTGB 1800cycles Rated 2,000mAh. Min 1,900mAh
4th Generation Eneloop model numbers and specs
AAA: BK-4MCC 2100cycels Min. 750mAh
...AA: BK-3MCC 2100cycels Min.1900mAh
......C: BK-2MGC 1000cycles Min.3000mAh
......D: BK-1MGC 1000cycles Min.5700mAh
1=D 2=C 3=AA 4=AAA
I just ordered these and got the 4th gen!!!!
Every single eneloop cell I have purchased in the past 8 years, including the original ones, are still in good working conditions. That says a lot about the quality of eneloop batteries. But the question is: are there any REAL improvements in later generations of eneloop batteries?
The advertised capacity ratings for all eneloop (1st to 4th-gen) batteries are identical:
- AA cells are rated "Typ. 2,000mAh, Min. 1,900mAh"
- AAA cells are rated "Typ. 800mAh, Min. 750mAh"
Actual capacity measurement, using my old La Crosse BC-900 Battery Charger, also showed that capacity numbers are consistent from 1st to 4th-gen. In fact, my measured results are consistently about 4-5% higher than the advertised values.
[Charge Retention Rate]
With each new generation, eneloop's long-term charge retention rate gets a little more ambitious:
- 1st-gen claims "85% after 1 year"
- 2nd-gen claims "85% after 1 year; 75% after 3 years"
- 3rd-gen claims "90% after 1 year; 80% after 3 years; 70% after 5 years"
- 4th-gen claims "90% after 1 year; 70% after 5 years"
Notice that those numbers are essential the same, just extending over longer period of time. In fact, I have tested a set of first-gen eneloop cells after 3.5 years in storage, and they still contain around 75% of rated capacity. To me, this shows that there are no real changes in the charge retention rate among different generations.
The main difference between different generations is in the advertised lifespan:
- 1st-gen: '1000 cyles'
- 2nd-gen: '1500 cycles'
- 3rd-gen: '1800 cycles'
- 4th-gen: '2100 cycles'
Let's consider how long it takes to actually test a rechargeable battery through 2100 deep discharge/recharge cycles:
The standard test procedure calls for charging at 0.2C (~5 hours) and discharging at 0.2C (~5 hours), plus cooling period of one hour each between charge and discharge phases. So a complete cycle takes about 12 hours. To exercise a battery through 2100 cycles would therefore take nearly three years!
However, 3rd and 4th-gen eneloop cells are both released less than 2 years from their previous generations.
My theory is that all eneloop 2nd/3rd/4th gen batteries are in fact made with the same battery technology. It takes many years to collect the actual cycle life and charge-retention rate data. Therefore only later generations are able to advertise higher number of cycles and longer storage life.
If my theory is true, then it follows that there's no reason to pay higher price to get the latest 4th-gen eneloop. Any earlier generation of eneloop would perform just as well.
Finally, if you are extremely 'value conscious' like me, consider the following rebranded eneloop batteries and get the same quality for even less:
- AmazonBasics Pre-Charged Rechargeable Batteries (in white wrappers) are rebranded Sanyo eneloop.
- AmazonBasics High-Capacity Pre-Charged Rechargeable Batteries (in black wrappers) are rebranded SANYO eneloop XX batteries
- Duracell Ion Core AA Rechargeable Batteries are rebranded Sanyo XX, while Duracell Ion Core AAA cells are rebranded eneloop AAA batteries
[Update on Dec 22, 2015]
For additional information on eneloop batteries in general, please refer to my newly updated "Panasonic/Sanyo eneloop FAQ":
It's easy to spot the newest model purely because they are Panasonic branded
The cells are quoted as retaining up to 70% of their capacity for 5 years and are ready to use out of the box
I tested the pack I got and the capacities ranged from 2020-2078 mAh this can vary a bit but you're guaranteed a minimum of 1900 mAh. Unlike some other makers you can be sure you'll get the quoted capacity Despite the higher cost per battery the longevity of the Eneloop batteries has been very good I've had sets for a good while now (over 5 years) and they're still going strong where as some budget offerings have lost their capacity or worn out after a few years. I've also never had a problem with the Eneloop cells fitting, in the past a few makers have played around the standard AA size and some are a bit longer or larger in diameter this can cause problems on some devices fitting wise.
On the packaging Panasonic recommend using their own chargers, but I've never had a problem with a good quality third party smart/intelligent charger with any make of battery it's well worth investing in one of these as it can extend the life of cells and avoid overcharging problems that some timer/manual chargers have.
**A few chargers worth looking at**
Maha MH-C9000 (very advanced high end charger)
Technoline BL-700 or BC1000
The official Panasonic charger is: BQ CC16 this is an intelligent charger with individual monitoring and charging of cells, I don't recommend the basic BQ CC18 it works fine but it is timer control only.
A decent budget 8 cell intelligent charger is the KooPower 8 Bay smart charger (this seems to be available in a few brand names same design though)
Some of the top end chargers have multiple charging speeds and testing capabilities as well as discharge/re-fresh cycles. If you don't need these features then just go for a normal smart charger it's worth the small additional cost.
There are some cheaper batteries out there, and some decent budget offerings too. But despite the higher cost this seems to be levelled out with the lifespan of the batteries. Hard to fault really a very reliable and solid offering and suitable for use in a wide variety of appliances even heavy drain items like flashes and digital cameras. For super high capacity users take a look at the Eneloop Pro range