Dreamer, this thing isn't going to have detailed info in the menu yet. All the other details were originally displayed in a different way on the N8x0s, and the fully menu hasn't been ported over to the N900's way of displaying things yet.

RenaldoTT - Not for a long time. I would say that you're not missing out on too much if you're worried about enabling Testing/Devel. It's a really good application, but unless you want approximate times left active and idle for battery life, you can probably be okay without this one. (Though I felt it was a bit more accurate than the default one unless you're running the power kernel's bq27x00 module. Then it and BME conflict, causing it to underreport the charge left.)

On that note, I never did test what happens when I rmmod that thing. (Lately my battery has developed another bug too, in the form of not switching to the green light when finishing charging, funny enough. Doubt it has to do with this though. Currently looking it up on here.)