First post, been lurking for a few weeks.
@Kumar Saurav If the device is not faulty, it's probably just a calibration issue. I have had similar problems in the past with other devices, most recently a new laptop.
My understanding is, to avoid irreparable damage, Li-ion batteries shut down before they are fully discharged at about 10%. What we are trying to achieve, is display the 10% actual battery life as the starting point of 0% on the device.
This is worth a try, it fixed a similar calibration issue for me. Run your N3 battery completely down until it switches itself off. Leave it for a while, switch it on, it may have recovered a little but will switch off again, probably not finishing booting. Leave the unit off, plug in the cable and fully charge it, until the white lines go solid. The unit should now show 100%. The circuitry should remember the 0% and 100% positions and calibrate accordingly.
It's not recommended to run Li-ion completely flat too often. A good quality 2amp charger is recommended and should charge the N3 from 0 - 100% in a couple of hours.