Keep your x 230T or x 220T system powered for longer with the 6-cell Think Pad Battery 67+. Compatible with the X220T & X230T systems, this battery can be used as a replacement or as a convenient spare for additional power on the go. On average, the battery lasts for 66 watt hours & can be recharged. The Lithium-Ion technology ensures a safe flow of power & each battery is safeguarded against damage from incorrect voltage with over-discharge protection. However, it is not compatible with the Think Pad External Battery Charger (40Y7625). * Battery life is affected by a range of factors. These include: battery conditioning, power management, applications, screen brightness, features & other customer preferences.