But there is one thing more to tell about the battery of the n900 , it is only a Li-Ion battery against the much better Li-Polymer of the N810. When compared to a lithium-ion battery, a Li-poly has a greater life cycle , and lower weight and greatly increased run times. Nokia gives the N900 not only less battery-power , from 1500mAh to "only" 1320 mAh but also a worse battery-technologie from Li-Polymer to Li-Ion.
The advantages of Li-poly over the lithium-ion design include lower cost manufacturing and being more robust to physical damage. Lithium-ion polymer batteries started appearing in consumer electronics around 1996.