Hey, I found a place that sells SLA (sealed lead acid) batteries pretty cheap. Between US$5 and $20 can get you can get a SLA 6v battery. Hahah they even sell the power wheels batteries. Only $25 for those.
Amps x volts = Watts. So If webplayer uses 5v@5a = 25watts.
If we put in a 7Ah Battery, we can run at least an hour and a half.
i don't think it would be hard to build a strap or frame mechanism to mount the battery behind the monitor.
All we need is a way to drop the voltage from 6vDC to 5vDC, which shouldn't be hard at all.
The battery listings are at:
they even have a SLA charger for $6.95
If someone wanted to go all-out, they have a 12v 225Ah battery, we could run our webplayers for over 45 hours on this sucker... too bad it's $300 and weighs 161 pounds! the forklifts at my work run off of 6 of these batteries! any takers???
Oh yeah... With the $6.95 charger, it would take almost 19 days to recharge that monster battery!!!!!