The ThinkPad battery 44+ is ideal as a replacement or convenient spare battery for your X220 and X230 systems. It utilises advanced lithium-ion and lithium-polymer technology, allowing you to stay unplugged for longer. The 4-cell system is rechargeable and is compatible with the ThinkPad External Battery Charger (40Y7625). On average, the battery lasts 29 watt hours.
*A multitude of factors causes battery life to vary. These include: applications, power management, features, battery conditioning, screen brightness and other custom preferences.