T440S sometimes won't boot unless i detach the internal battery - Thinkpads Forum
Does the T440p have an internal battery? : r/thinkpad
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For Lenovo ThinkPad T440 T440S T450 T450S X240 X250 X260 X270 45N1110 45N1111 45N1112 11.1V
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Lenovo Thinkpad T440S Battery Replacement - iFixit Repair Guide
