Battery change failed

We have a Braun Oral B Professional Care has now 3 years works super well. The battery can now clearly after and he must be constantly charged so that two minutes brushing also holds. On YouTube I came across the video conversion from Seibelt, got me looked at us then ordered the battery.

I'm actually not technically inept. I tinker and fix much but here I had to give up. The opening of the bottom lid has still works well but at the dissolution of the inner life of the toothbrush from the case I have failed. Despite exerting constant pressure on the axle and release the clip to the inner life has not moved. I then looked at another video (Zax). There first had to be removed at the axis of the upper blue ring. I have also tried but sat so firmly that already the first signs showed destruction as I have also attempt aborted. I

I buy a new toothbrush now and throw the old one away. Very unfortunate. The battery I return. I forgive scarce 3 stars because of the replacement battery is probably OK but I could not test and because I have to carry the costs of return of 3.50.