How to remove the battery of lenovo tablet?

There are dozens of different tablets made by Lenovo!

Presumably it's a type that has an internal battery?

There are rather generic instructions for those on the lenovo web site - see the links here:

http://support.lenovo.com/...s/pd026805
(Note the two links at the top of the page, to get to that stage of dis-assembly).

If that does not apply to your device, post a new question and include the full model name and number of your tablet.

Your answer can be found on youtube. Make sure you got the right tools before opening it.