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Panasonic BK-4MCCA4BA eneloop AAA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, Pack of 4
List Price: | $14.99 |
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$10.49
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Brand | Eneloop |
Voltage | 1.2 Volts |
Compatible Devices | Solar |
Item Dimensions LxWxH | 0.44 x 3.38 x 4.25 inches |
Reusability | Rechargeable |
About this item
- Make sure this fits by entering your model number.
- Sold as "Pack of 4" i.e. 4 Batteries in a Pack
- Recharge up to 2100 times
- Maintain up to 70% of their charge after 10 years (when not it use)
- 800mAh type, 750mAh 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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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(7.5.1.3). ***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.
eneloop
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****
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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.**** |
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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 |
Recyclable | Yes | Yes | Yes | Yes |
Country of Origin | Made in Japan | Made in Japan | Made in Japan | Made in Japan |
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Customer Rating | 4.7 out of 5 stars (23982) | 4.7 out of 5 stars (233689) | 4.8 out of 5 stars (7369) | 4.6 out of 5 stars (146246) | 4.8 out of 5 stars (1835) | 4.7 out of 5 stars (28612) |
Price | $10.49$10.49 | $3.59$3.59 | $17.99$17.99 | $13.49$13.49 | $14.99$14.99 | $18.97$18.97 |
Shipping | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime |
Sold By | Amazon.com | Amazon.com | Amazon.com | Amazon.com | Amazon.com | Amazon.com |
Battery Cell Composition | NiMH | Alkaline | NiMH | Alkaline | NiMH | NiMH |
Size | Pack of 4 | 4 Pack | 4-Pack | AAA 12 Pack | 4-Pack | 5 Piece Set |
Product description
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.
Product information
Style:AAA | Size:Pack of 4 | Configuration:Batteries onlyProduct Dimensions | 0.44 x 3.38 x 4.25 inches |
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Item Weight | 0.048 ounces |
Domestic Shipping | Item can be shipped within U.S. |
International Shipping | This item can be shipped to select countries outside of the U.S. Learn More |
ASIN | B00JHKSMJK |
Item model number | BK-4MCCA4BA |
Batteries | 4 AAA batteries required. (included) |
Customer Reviews |
4.7 out of 5 stars |
Best Sellers Rank |
#274 in Health & Household (See Top 100 in Health & Household)
#6 in AAA Batteries #11 in AA Batteries |
Is Discontinued By Manufacturer | No |
Date First Available | April 11, 2014 |
Manufacturer | Panasonic |
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Customer reviews
Top reviews from the United States
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[Individual Charging]
The BQ-CC55 handles 1-4 AA or AAA cells independently. This is the only way to ensure each cell is fully charged but without overcharging. In contrast, the old charger MQN06 can only charge in pairs.
[Faster Charge Time]
The BQ-CC55 is advertised as a ‘3-hour charger’. On the back of the unit it claims output current is 750mAx4 for AA, 275mAx4 for AAA. But my actual observation shows that it is a bit complicated.
The unit uses pulsed current for charging:
- When charging 1-2 AA cells, the current pulses from 0 to 3A at 46%, for an average of 1400mA
- When charging 3-4 AA cells, the current pulses from 0 to 3A at 23%, for an average of 700mA
- When charging AAA cells, the current pulsed from 0 to 1.25A at 46%, for an average of 575mA.
For example, suppose you are charging some 2000mAh AA cells. The charge time will be around 1.5 hours for 1-2 cells (because 2000mAh / 1400mA = ~1.5h), or 3 hours for 3-4 cells. This is significantly faster than the previous model Panasonic BQ-CC17 , which takes around 7 hours since its average charging current is only 300mA.
[Battery Status Indicator]
The BQ-CC55 has four battery status indicators. Each indicator changes color according to the fullness of each cell:
Red = nearly empty
Yellow = half full
Green = Full
Blinking Red = Bad cell.
Note that the description says Yellow = 20-80% and Green = 80-100%. This is not entirely accurate based on my observation. The moment an indicator turns Green, charging for that channel stops. That means the cell is already 100% charged and safe to be removed. Once all four channels have finished charging, the unit enters low-power standby mode and all LEDs are turned off.
[Power Consumption]
I measured the input power of the BQ-CC55, using my EUM-A1 Power Usage Meter :
- In standby mode the unit consumes just 0.2W
- When charging 1 AA cell: ~4W. This is consistent with an output of ~2.5V at 1.4A.
- When charging 2-4 AA cells: ~8W
[Bottom Line]
The Panasonic BQ-CC55 is a big improvement over previous eneloop chargers, including MQN05 and BQ-CC17. If you don't already have an Advanced charger at home, I definitely recommend getting this unit.
[Minor Issues]
- Charger makes a faint buzzing sound while charging with pulsed current.
- Due to higher current, this charger is more likely to reject batteries with marginally high impedance.
Some explanation on impedance check:
Many smart chargers (including the Panasonic BQ-CC17, BQ-CC55, Maha MH-C9000, etc) perform an impedance check before the start of charging. This is done by sending a high current pulse briefly through the cell, and measure its voltage drop. This gives an estimate on the internal resistance of the cell. The reasons for doing this are:
1. If the user accidentally put an alkaline cell in the charger, it will be rejected due to its higher resistance. Otherwise if you recharge an ordinary alkaline cell in a NiMH charger, it may leak or rupture.
2. If the cell is the correct NiMH type but suffers from higher resistance, it will also be rejected. Otherwise the cell will generate excess heat when charged at high current. Heat will shorten the cell's lifespan, or even cause the cell to leak or rupture.
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!!!!
Top reviews from other countries

The product you'll receive is BK-4MCCE/4BN, as stated in the title and description. But the picture shown is of BK-4MCCA4BA — the last letter is different. The former maintains up to 70% charge for only 5 years of storage. The latter maintains that much charge for 10 years.
Buyer beware!



Reviewed in India on September 13, 2018


Not only do they last longer than the "name brand" Alkaline batteries I was previously using, they're rechargeable which results in less environmental waste and more money in my pocket. Win/Win!
I use these batteries primarily for my Xbox One X controllers. I game several hours daily, as well as using to control/navigate apps, streaming, bluray player etc.. and these batteries last a week+ before needing to be recharged.
I use the BQ-CC17 charger. It plugs directly into an outlet and is fairly low-profile. A green LED light is visible for each battery during the charging process. The LED lights turns off and the charger will shut-down once charging is complete. This is a great safety feature, especially for overnight charging. Charging takes approx. 6 - 7 hours to complete.
Previously spending $10 per month on non-rechargeables, these Eneloops have already paid for themselves. I've been using them exclusively for over a year with no issues.
If you're looking for long lasting, quality rechargeable batteries... I recommend you try Eneloops. ★★★★★
The environment and your wallet will thank you!
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Reviewed in Canada on March 9, 2020



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