4th Generation eneloop PRO from Panasonic BK-3HCDE,  the latest version in the superb range of high capacity award winningeneloop rechargeable batteries. The 4th Generation eneloop PRO battery from Panasonic has a minimum capacity of 2500mAh (typical capacity 2550mAh) and is generally considered to be the ultimate professional standard AA battery available anywhere today.

They retain approx 85% of their chargre after 1 year and about 70% after 5 years

Eneloop PRO Batteries are Panasonic’s newest offering in rechargeable battery technology. The

company that is generally regarded as leading the world in this field, has done it again!

It is well known that high quality NiMH rechargeable batteries outperform disposable ones (including 
even the very best alkaline batteries) in power hungry gadgets such as digital cameras, but there were 
2 areas where they had problems.....
1.) They had to be charged before first use.
2.) Once charged they would run down without even being put in anything, typically losing around 25% 
of the stored energy per month. Not really a problem when you are charging them frequently, but for low
power or occasional uses this could become inconvenient.

Eneloop PRO batteries have taken the concept of low self discharge batteries a step further.
The one main drawback of this type of battery was the lower capacity to the conventional rechargeable
types. With a genuine capacity of 2500mAh this has now been addressed.
We have tested many batteries over the years & these are without a doubt the best yet.

Detailed Technical Specifications:

Panasonic Eneloop Batteries Leaflet: