Help with starting

Hi

I'm having problem with starting.......bugger

Have been having trouble starting bandit. It will start if I jump start with jumper leads on car.

I have put the battery on the charger...Still no start.

I have taken battery to get tested at battery shop. They said that it was fully charged.

I have checked the wiring from battery terminals to the starter motor... All good no breakages anywhere.

i don't like the sound of what I have been reading about starter motors cost wise. She has only done 9400k, not many k's for an 09 Bandit.

As I am not experianced in the mechanics department (learning as I go).

Is there a better quality starter motor that used in place of origonal one or is that the only one to be used?

Also can a replacement be put in by yourself or do I have to take to either Auto elec or Bike shop?

Any help be appreciated.