i ve been using them for the past 4 years now, i have so many that i cant keep track of them all but i know that most of them are doing well. i even have some from the first year still.
most of them will last one good season i.e. 120 shooting days or more.
but some of them lasted only a few weeks, i only returned them to my supplier and they would trade them for new ones.
it seems they know that they sometimes have that problem. i dont know if your supplier can do the same for you.
one of my colleagues says he doesnt use them just after charging them, he waits a couple of hours.
