I have 9 years I think about the 40 pieces of AAA and AA batteries (800mAh and 2000mAh) in private use.
Meanwhile there is a newer version of Battery Pack "...- B" at the end of the type designation I mean.
It is really not too much promised. I wonder always how long the batteries in my rarely used flash their service do.
Bin perfectly happy with the batteries - no comparison to the crutches of 15 years ago!