For now it's good

By definition, a "stack" is not rechargeable. Here we added "battery" that way everyone is happy.
Used for a cordless telephone handset duo.
For now this is good. I have a few months and compared to the original pilles (major brand) they properly fulfill their role: one can talk on the phone more than two hours (this is my record and not a final estimate Come on, I run a contest.). To recharge I do not know yet létendu. I minquiéterais rather the effect memory, but, hey, for that price I do not think better.
Four stars only because of the continuity that is still unknown.

They are nickel-metal hydride batteries months pollutant and with higher energy density of at least 30% compared to NiCd (nickel-cadmium). They are now themselves overwhelmed in terms of mass energy by the accumulators Li-ion (Lithium-ion).
Highlights NiMH
Contains much more energy than nickel-cadmium
Insensitive to the memory effect
Simple to store and transport
Contains no cadmium
Weaknesses NiMH
Does not support passing load
Detection of difficult end of load (v very weak)
Lower life than nickel-cadmium in cycles
(Source Wikipedia)

Enjoy