I tried rebooting my Z10 by removing the battery but when I inserted the battery my phone is not rebooting. It just says "blackberry" and goes no further. HELP. I NEED MY PHONE.
More details will help us help you.
The Z10 depending on the amount and type of Apps can drain a battery quick.
that will cause the battery to seem full but drop quick.
Doing what Knottyrope suggests may give you some indication of what the issue is.