BYD 8 Pack AAA NiMH Pre-Charged Rechargeable Batteries Product Features 8-pack 2000 mAh rechargeable AA batteries for digital cameras remotes and more. Pre-charged and ready to use right out of the pack;Extremely slow self-discharge rate maintains 80% of capacity after 1 year of storage at 20℃. Greater Power and Better Performance in lower temp than Alkaline.Combines best features of AA alkaline (ready to use) and rechargeable (reusable) batteries Can be charged up to 1000 times (including partially) without experiencing memory effect[]

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Sanyo Eneloop AAA Pre-Charged Rechargeable Batteries are perfect for TV remotes portable flashlights and more. These batteries are pre-charged and ready to use right out of the pack. Their extremely slow self-discharge rate maintains 85 percent of their capacity after 1 year of storage. These batteries can be charged up to 1000 times without experiencing any memory effect.

• 4-pack of 800 mAh rechargeable AAA batteries for TV remotes portable flashlights 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 AAA alkaline (ready for use) and rechargeable (reusable) batteries


• Can be charged up to 1000 times (including partially) without experiencing memory effect

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• GP BRAND NAME !!! Recyko+ 8 pack AAA 850 mAH Pre-Charged ready to use right out of the pack


• rechargeable up to 1000 times


• very slow self discharge maintaines 85% capacaty

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Ideal for digital and high drain devices pre-charged and ready to use straight out of pack. Retains power for up to 365 days while not in use unlike regular rechargeagles. Can be recharged 100 of times. Longer lasting in high drain devices than ordinary alkaline batteries.

• Includes: 4 AA and 4 AAA total 8 batteries one Charger


• Duracell Pre-Charged batteries are charged and ready for use right out of the package


• Duracell Pre-Charged batteries retain power for up to 365 days while not in use


• Can be recharged and reused hundreds of times


• Stays charged longer than RCR and have to be recharged less often

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Designed for today's high-drain digital devices Sony 2500mAh rechargeable batteries last up to five times longer than standard alkaline batteries. These economical environmentally-friendly Nickel-Metal Hydride (NiMH) batteries can be recharged up to 300 times.

• Ideal for digital products


• High capacity -- lasts 3 times longer than alkaline


• Designed for use with Sony’s advanced power charge

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Duracell Pre-Charged Rechargeable NiMH AAA Batteries (4pk) are ideal for high-drain items such as digital cameras gaming devices and portable audio products

• Duracell Pre-Charged batteries are charged and ready for use right out of the package


• Duracell Pre-Charged batteries retain power for up to 365 days while not in use


• Can be recharged and reused hundreds of times


• Stays charged longer than RCR and have to be recharged less often


• Contains 4 AAA pre-charged rechargeable batteries

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Duracell Pre-Charged Rechargeable NiMH AA Batteries (4-Pack) are ideal for high-drain items such as digital cameras gaming devices and portable audio products

• Duracell Pre-Charged batteries are charged and ready for use right out of the package


• Duracell Pre-Charged batteries retain power for up to 365 days while not in use


• Can be recharged and reused hundreds of times


• Stays charged longer than RCR and have to be recharged less often


• Contains 4 AA pre-charged rechargeable batteries

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Duracell Value Charger with 4AA Pre-Charged Rechargeable NiMH Batteries - CEF14DX4

• Charges 4 AA or AAA batteries


• LED to indicate charge status


• Compact size is great for travel


• Plugs directly into the wall - no cords


• Comes with 4AA Pre Charged rechargeable batteries

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LSD is great.... just keep away from heat!

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 based on manufacturer date codes. 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.



Thanks to lower self-discharge rate you'll discover a lot more applications for eneloop cells in your house such as in clocks and remote controls. Do NOT use those cell in smoke detectors since their discharge voltage profile is very different from that of alkaline cells. Also 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.

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Don't confuse those with Duracell 'Pre Charged' batteries

I can't believe it! Just when we thought we've got the Duracell battery color scheme figured out those folks at Duracell pulled another cheap trick out of their collective... hat!



To recall here is the color scheme for Duracell AA/AAA batteries:

- Duracell alkaline cell has the famous 'copper top' and a black bottom

- Traditional Duracell Rechargeable NiMH (DC2400) cell is green and black in color

- Newer Duracell Pre Charged NiMH cell has a 'copper top' and a green/black bottom



The latest batch of rechargeable AA/AAA NiMH cells from Duracell all have the 'copper top' and green/black bottom similar to that for 'Pre Charged' version. However those cells don't say 'Pre Charged' on them. Instead they have their capacity printed (2650mAh for Duracell DC1500 AA 1000mAh for Duracell DC2400B4N AAA). It is important to know that: those are NOT the low-self-discharge type like Sanyo Eneloop. They are traditional NiMH cells which have higher capacity but suffer from rapid self-discharge problem. So even though their prices may look attractive those are no bargains.



Remember: "If it doesn't say 'Pre Charged' put it back!"

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Good Batteries Bad Charger

This package (CEF14DX4N) includes four new Duracell 'Pre Charged' NiMH AA cells plus a simple charger. The batteries are similar to the Sanyo eneloop low-self-discharge cells. In fact based on their identical technical specifications and physical shapes of (+) and (-) terminals I am convinced that the Duracell Pre Charged AA is actually SANYO eneloop AA underneath a different wrapper. Therefore all the good things you heard about eneloop apply to Duracell 'Pre Charged' too.



The 'value charger' (CEF14) included here however is not a good value because:



1. It is a timer-based dumb charger meaning that it doesn't detect when cells are full charged. It simply charges at 360mA for 6 hours and turns off. You have to wait until your cells are fully exhausted before recharging otherwise they will be over-charged. With a 'smart' charger you may choose to top-off your rechargeable cells any time.



2. It can only charge either 2 or 4 AA cells in pairs. This is very inconvenient if you have appliances that require odd number of cells.



3. It can only charge two AAA cells and you cannot charge any more AA cells at the same time.



My advice is to get the CEF23DX4N package for just a few dollars more. It comes with four Duracell Pre Charged cells (2xAA + 2xAAA) but the included charger (CEF23) is far superior in every aspect. It even operates from your vehicle battery and doubles as an USB charger too.



[Update on Dec 24 2008]

I was only half-right when I boldly proclaimed that "Duracell Pre Charged AA are rebranded Sanyo eneloop cells" in my original review. It turns out that the first batch of Duracell AA cells I bought from Amazon are made in Japan and those are identical to eneloop (both mechanically and electrically). But lately I bought some more Duracell AA from a warehouse club. Those are made in China and they are identical to the Rayovac Hybrid.



[Update on Feb 15 2010]

I have confirmed that the new Duracell 'Value Charger' has several improvements over the old model:

- Works from 100-240V AC (instead of just 120V AC)

- Able to charge 4 AAA at a time (instead of just two)

- Semi-smart charge termination (stops when BOTH cells are fully charged)

The only remaining drawback is thet it charges in pairs only.More detail ...

An eneloop by any other name...

[Updated Dec 24 2008]

I was only half-right when I boldly proclaimed that "Duracell Pre Charged AA are rebranded Sanyo eneloop cells" in my original review. It turns out that the first batch of Duracell AA cells I bought from Amazon are made in Japan and those are identical to eneloop (both mechanically and electrically). But lately I bought some more Duracell AA from a warehouse club. Those are made in China and they are identical to the Rayovac Hybrid.



[Original review follows]



Judging from similarity of technical specifications and physical shapes of (+) and (-) terminals I am convinced that the Duracell Pre Charged AA is actually SANYO eneloop AA underneath a different wrapper. Therefore all the good things you heard about eneloop apply to Duracell 'Pre Charged' too.



My own testing has shown that the capacity of eneloop AA cell is slightly above the claimed 2000mAh and it is able to retain at least 85% of its charge after 5 months in storage. The Rayovac Hybrid AA starts with slightly higher capacity at 2100mAh but it 'only' retains 80% capacity after 5 months. For all practical applications both are equally good. Just pick whichever brand (Sanyo Rayovac or Duracell) is on-sale and you can't go wrong.



One small problem with the Duracell 'Pre Charged' cell is that: it looked too similar to the well-known 'Copper Top' alkaline cell. So there is a good chance that people may mistaken it for a disposable cell. Personally I prefer the distinctive-looking white case of the eneloop cell.

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