Some informations about the change of battery cells are here.
There was a common principle "It goes well if you don't think about it , but it goes bad if you think about it" That was exactly the case.
I should rather buy the displayed one without no thinking, but when I saw many stocks on the rack, I was not my line to select one of them.
So I chose the one with this battery which will charge eternaly...
But I tried to restructure it to change the tired CGR17500 cells to the fresh one and check them if there were the alive ones with the current tester.....and I found I forgot to take back it in my office....next work was on wendsday....(to be continue...)