Is there a current (amps) / power sensor in the N900's power circuit?

Even if it's not possible to predict battery time accurately, it would be great to have fast feedback on power consumption while running different apps, widgets, different network settings, mobile signal levels, etc.

Right now there's a fair amount of advice about what you have to avoid or disable to get good battery life, but some of it is guesswork. It would be great to have measurements. It would also help developers optimise their apps to reduce power consumption.