The 6-cell ThinkPad battery 57+ is a replacement/spare battery for W541, W540, T440p, T540p, W540, L440 and L540 systems. The battery is rechargeable and can be used as replacement or as a convenient spare for several popular ThinkPad systems. This battery is powered by Lithium-Ion technology and has a safeguard chip which authenticates with Lenovo systems. The battery lasts on average 57 watt hours* and utilises over-discharge protection to ensure a secure flow of power.*Many factors affect battery life. These include: screen brightness, battery conditioning, features, applications, power management and other customer preferences. Lithium-ion technology6 cell system batteryOver-discharge protection to prolong the life of the batteryBattery energy (Watt-hours): 57WhBattery Safeguard chip authenticates with Lenovo systems
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