What is battery 1 and battery 2 in Lenovo ThinkPad?
New Genuine Lenovo ThinkPad L21C3PG1 L21L3PG1 L21M3PG1 Battery 42WH
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Open Apr 16, 2026 - 08:52 AM
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Apr 16, 2026 - 08:52 AM
In Lenovo ThinkPad laptops, "battery 1" usually refers to the internal battery built into the laptop, while "battery 2" refers to an external, removable battery. Some ThinkPad models use a dual-battery system (called Power Bridge) that allows you to swap the external battery without shutting down the laptop, as the internal battery keeps it powered.
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