ThinkPad R30/R31 Li-Ion Battery
With the unique ThinkPad SmartBattery capability, your system maximizes the amount of time you can be up and running. And if you're not sure how long that is, SmartBattery can tell you how much power you have left.
Lithium Ion technology gives this battery a longer life, and lighter weight
Spare battery convenience allows you to work unplugged as long as you want
Lenovo TS LI-ION BATTERY. Battery technology: Lithium-Ion (Li-Ion), Battery voltage: 10.8 V, Colour of product: Black. Weight: 420 g. Dimensions (WxDxH): 70.3 x 246.2 x 30.6 mm, Battery type: Lithium-Ion