I've been wondering if the reason Nokia describe the N900 as an "Internet Tablet" rather than as a "Mobile Phone", might be due to the only information that doesn't seem to be mentioned in the published Technical Specifications - the expected operating time on a full charge.

My N800's BP-5L battery is rated at 1500mAh and only gives me about 3hrs running when disconnected from a charger. However, I see that the N900's BL-5J battery is only rated at 1320mAh and will have to cope with GSM & GPS too. I expect about 1.5hrs, or less.

No way could they get away with selling something with this sort of standby/talk time as a "Mobile Phone". However, as a constant user of an "Internet Tablet" I'd welcome the GSM and (built in) GPS functionality, and am used to the need to keep a charger with me.

Does anyone have any concrete data on the battery operating times?