These batteries' button can come off inside, get out of alignment where you can't use it. Here is how i fixed mine:
I moved it as close to center as I could without breaking the small circuit board with a toothpick. Note: something metal would be better. Like a small pick.
Then I cut the end off a screw so it was flat and heated it with a blowtorch for about 30 or 40 seconds until it is hot enough to melt plastic. Then very carefully place it in the battery button hole, wiggle gently while still hot enough for the plastic button to be pliable. This isn't long, but you can start over if needed.
The original button will melt a bit and form itself around the screw's threads making a nice permanent seat.
In fact if you destroy/melt the button entirely, just remove it and there is a white rectangular plastic "button" underneath the standard blue button equipment that you can attach a screw or anything else you think of to if needed. Last resort thing.
I do not have a small channel lock, so I simply used a needle nose pliers to hold and attach.
Then I have a screw top as my button. The led's still light and flash when put into a charger.
I have been using this for about 6 months now without a problem.
here is a picture:
I have been using it like this since February.
Easy.
The only drawback is you have to kind of center it with your finger when pressing, not a big deal (for me anyway).
I did try a lighter first and could not get the screw hot enough.
I moved it as close to center as I could without breaking the small circuit board with a toothpick. Note: something metal would be better. Like a small pick.
Then I cut the end off a screw so it was flat and heated it with a blowtorch for about 30 or 40 seconds until it is hot enough to melt plastic. Then very carefully place it in the battery button hole, wiggle gently while still hot enough for the plastic button to be pliable. This isn't long, but you can start over if needed.
The original button will melt a bit and form itself around the screw's threads making a nice permanent seat.
In fact if you destroy/melt the button entirely, just remove it and there is a white rectangular plastic "button" underneath the standard blue button equipment that you can attach a screw or anything else you think of to if needed. Last resort thing.
I do not have a small channel lock, so I simply used a needle nose pliers to hold and attach.
Then I have a screw top as my button. The led's still light and flash when put into a charger.
I have been using this for about 6 months now without a problem.
here is a picture:

Easy.
The only drawback is you have to kind of center it with your finger when pressing, not a big deal (for me anyway).
I did try a lighter first and could not get the screw hot enough.