powerful, but also failures ...

The battery performance is very good, some are loud charger even 2,8-2,9A loaded and I can use it in regular. Use my xbox controllers operate very long.

However, already 2 are no longer recognized by the 4-pack from the charger and the batteries are almost nen year old.

Do I have to think it over, whether I reach back to Sony, because the performance is already good, then the 2100er series was top.
But if they already give up after a year, I find that quite shortly.
There are also 1 star deduction for durability.