4 of 5 people found the following review helpful
Were good for 3 months.,
Verified Purchase(What is this?)
This review is from: UltraFire BRC 18650 3.7V Rechargeable 4000mAh Li-ion Batteries Battery - Black + Golden (Pair) (Electronics)
These were great for the First 3 months.
However I have found they do not take their charge as effectively as other Ultrafire batteries do after the same period.
I suspect that the ones I have got are chinese copies....
They are cheap for Ultrafire....