Battery life remain 100% after half hour usage?!!
Normally any usage will drop the battery rate a few percentage point. However, after half hour the battery remain 100%. Let's hope this is not a fake indication while the battery is draining internally. I did use Battery Guru to check it also indicated 100%. I also notice my battery health is at 84%. As far as I can remember this particular Playbook had 100% health. I'm a bit concerned being in a country that uses 240V to charge my Playbook might have an adverse effect on the battery health despite using the universal Rapid charger.
Re: Battery life remain 100% after half hour usage?!!
From Battery Guru you should also get voltage and watts on the screen and of course you can still export values to a spreadsheet or CSV data viewer. As has been said many times BG gets its values from the PB measurements fed to it. The true measurement of the potential of a battery is given when the current is very small. So if you want to get the best value for what voltage your battery has been charged to dim your screen, use airplane mode and only run BG. And of course you don't know the accuracy or precision of your measurement. Temperature is another variable.
This is probably much ado about nothing.