'By that time EDIG's battery life will be at 1,000 hours?'
lol...you'll just don't get it.
Edigs power consumption allowing 20 hrs of continuous play time has nothing to do with the battery.
If edig implements a 40 hr battery...they'll draw off of it with continuous play 60 hrs.
edigs tech has a proportionate measured consumption of any battery.
doni
