This is a brand new Dell Inspiron N4010 battery. This Dell N4010 battery is rated 11.1 volts and 5200 mAh and will normally last 3 hours on a full charge. You can get longer battery life by dimming your screen and closing unused programs and applications.
This Inspiron N4010 battery contains the very best Li-ion cells on the market from Samsung. An important specification to look for with rechargeable batteries is the mAh (mili amp hour) rating or Whr (Watt Hour). This battery is rated at 5200 mAh or 58 Whr. This is the highest rating available for a 6 cell battery pack. The higher the mAh rating, the longer your battery will run before it needs to be recharged again. There are no compatibility issues if your existing battery is rated at 4400 or 4800 mAh or a lower Whr.