The battery life of the shipped BL-5J (1320mAh) battery in N900 seems very deficient

nokia n900 front and samsung same model

Battery and SIM

nokia n900 battry sim memory

The battery life of the shipped BL-5J (1320mAh) battery in N900 seems very deficient and it was not able to make it through a full working day with a internet connection and call usage.[65] In a press release[66] Nokia stated they are aiming at "one day of full usage"[67] or "Always online : Up to 2-4 days (TCP/IP connected)" and "Active online usage: Up to 1+ day". Early reports from users range from 12 hours (Wi-Fi on, web browsing, video and some GPS),[68][69] to about 2 days online but not used continuously.[70] The value appears to be highly dependent on the user's choice of background software, active desktop widgets, IM and email polling, as well as mobile network signal quality (especially 3G) and in some cases, software bugs. Nokia reported talk times are around 9 hours with GSM and 5 hours with 3G.[71] Battery life can be extended significantly by switching off GPS/A-GPS, Wi-Fi, and Bluetooth and by replacing 3G by 2G / GPRS.

While previous Internet Tablets used larger batteries (1500 mAh compared with the N900's 1320 mAh), they are based on a less efficient microprocessor. Typical battery time for the Nokia N810 is around 7 hours of continuous full usage, display and Wi-Fi on. In principle, On N900 figures are expected to be much higher. Third party extended batteries up to 2400 mAh capacity are available for the N900.[72]

The SIM card is located under the battery which can be accessed by removing the back panel of the Nokia N900. The microSD(HC) card socket is also located under the back cover (but not under the battery). No tool is necessary to remove the back panel.