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The 4-cell ThinkPad battery 82 is a replacement/spare battery for ThinkPad E-series system. The battery is rechargeable and can be used as replacement or as a convenient spare for ThinkPad E570, E570c & E575 systems. This battery is powered by Lithium-Ion technology and has a safeguard chip which authenticates with Lenovo systems. The battery provides 41 watt hours, and utilizes over-discharge protection to ensure a secure flow of power.