Cordless Drills - Screwdrivers testing

[postlink] https://best-screw-driver.blogspot.com/2012/05/cordless-drills-screwdrivers-testing.html[/postlink] http://www.youtube.com/watch?v=BxZAWA1kDykendofvid [starttext]Extreme test drill for survival. To check in a furniture board drilled holes until the battery does not sit the drill. Models are tested: AEG BS 12C2 Li, Bosch GSR 10,8-2-Li, Hitachi DS10DFL, Makita DF330DWE, Kress 108 AS 1.3 Set.

• drill bit went flat after the first few holes, you can even see the smoke on the later holes.
• are you sure the bit is sharp from the beginning to the end of the test??? :

 [endtext]