On Sun, 18 Aug 2013 05:14:21 GMT, Jan Panteltje
wrote:

Forgot to do the bounce test on the empty one...

The video mentions alkaline batteries. The Eneloop is a NiMH
rechargable battery.

Rechargable batteries have a safety valve that will blow off gas if
the battery is greatly overcharged. This would suggest that a fully
charged battery has more gas in it than a discharged one. If that is
correct, it would follow that fully charged battery should bounce more
than an empty one.
--
RoRo