Problem with Prop

Hello Can any body help with this situation.
i Have
St Model 1000kv brushless with prop saver
LiPo 3cell 20C 11.1v Battery
E-Pro 25A ESC
3D foam plane
Weight 370gram total
It use to fly with my older battery, which i
totaled after accidentally shorting it. So i bought a new
battery. But now everytime i throw the plane and give
throttle the prop comes off. Any body no why?
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Was old battery a 2 cell or below capacity and providing less oomph to motor?
How about some more detail. 1. Prop comes off by itself? perhaps rubber band or "O" ring is to old and stretched. 2. prop comes off with prop saver ? grub screw needs tightening if aluminium prop boss 3. Is prop a push on and the hole has enlarged with constant removal - replacement ? Buy a new prop.
To many variables for a straight answer
regards Alan T. Alan's Hobby, Model & RC Web Links
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