[atonement]

Originally Posted by KaMyKaSii

There is Kual extension Battery Stats which shows battery voltage, deducted capacity and charge or discharge rate.

Yes. I am using it since jailbreaking my PW3. The question mark at the end in my earlier post was kinda misleading.
P.S. I guess you never have to worry about excessively high battery temps. while reading outdoors! Mine gets to 48°C within 20-25 minutes under direct sunlight.