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Four Pack New Version Panasonic Pro ( was Sanyo XX ) Eneloop 2550 mAh Low Discharge AA Batteries

Part Number:K-SY4AA2500XX
Four Pack New Version Panasonic Pro ( was Sanyo XX ) Eneloop 2550 mAh Low Discharge AA Batteries
Your Price:$20.97
Retail Price:$25.99
Your Savings:$5.02(19%)
Includes ONE Four Pack and ONE Free Four Cell Battery Storage Case
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*NEWEST VERSION
  • Can be charged up to 500 times
  • Factory charged by solar energy
  • Made in Japan

This special price is for a bundle of one four-pack of Panasonic Pro (Sanyo XX) Eneloop AA 2550 mAh batteries.

Panasonic's next-generation nickel metal hydride battery eneloop.

Batteries have a property to release the stored energy in small amounts (this phenomenon is called self-discharge). This property is particularly noticeable in rechargeable batteries such as Nickel Metal Hydride Batteries etc. as compared to dry cell batteries, hence disabling rechargeable batteries from becoming batteries that customers can use immediately after purchase. For this reason, rechargeable batteries couldn't be used unless charged after purchase and so lagged behind dry cells in convenience. This new products main property is that it has introduced great improvements in self-discharge properties (residual ratio after one year of non use is 75%, in temperature conditions of 20 degree Celsius according to SANYO research). Through this breakthrough development, SANYO has realized a rechargeable battery that can challenge dry cell batteries in user-friendliness through features such as making possible use immediately after purchase or once charged, its ability to be used anytime.


How was the self-discharge reduced?

Modern Ni-MH batteries consist of two metal stripes ( anode and cathode ), which are separated by a non-conductive porous plastic foil ( separator ). These three stripes are laid on top of each other and are winded to a coil. This coil is put in a metal can and immersed with a liquid ( electrolyte ). Then the metal can is closed with a cap. The self discharge of Ni-MH batteries is caused by three main reasons:

* the chemical decomposition of the cathode,
* the natural disaggregation of the anode,
* Impurities of the anode.


Now, how could the self-discharge in the eneloop been reduced? The chemical decomposition of the cathode has been reduced substantially by the use of a new superlattice alloy.

As an additional benefit the superlattice alloy increases the electrical capacity of the battery and reduces the internal resistance, which allows higher discharge currents.

Another advantage of the reduced decomposition of this alloy is the fact, that less Cobalt is needed to stabilize the alloy.

The anode has been strengthened by another new material, which reduces the natural disaggregation.

Additionally the separator and the used electrolyte have been optimised for low self discharge of the eneloop.

Low self-discharge - the key-advantage



What makes the eneloop unique?

The key-advantage of the eneloop compared to usual rechargeable batteries is its extremely low self-discharge.


Retains Capacity... Even After 12 Months


Once charged, eneloop retains its charged capacity even after 6 or 12 months of storage
(80% of Charged Capacity retained after 6 months, 75% Capacity after 12 months).

eneloop batteries are pre charged and is ready for immediate use after purchase, straight from the pack. Just like Primary Batteries. There is no need to charge-before-use.


For a rechargeable battery this is a revolutionary advantage.

No more worries about the state of charge of your battery.

Just, charge them and keep them.

Even after months you will still have an almost fully charged battery.


In contrast to a disposable battery the eneloop can be charged 500 times. This saves the environment and your purse.

Thus one eneloop saves the waste of 999 disposable batteries.




How was the self-discharge reduced?



Modern Ni-MH batteries consist of two metal stripes ( anode and cathode ), which are separated by a non-conductive porous plastic foil ( separator ).

These three stripes are laid on top of each other and are winded to a coil.

This coil is p

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