The 6-cell ThinkPad Battery 75+ will greatly extend your device's run time. Compatible with the E430, E431, E435, E440, E445, E530, E531, E535, E540 and E545 systems, it can be used as a replacement or a convenient spare. On average, the battery lasts for 62 watt hours and can be recharged with the ThinkPad battery charger. Each one utilises efficient Lithium-Ion (Li-Ion) technology and ensures a safe flow of power with over-discharge protection.
*The battery life is affected by many factors. These include: power management, screen brightness, features, battery conditioning, applications and other customer preferences.