Lenovo Thinkpad Advance Ultrabay Battery II Handbuch Seite 7

Power cords and power adapters
Use only the power cords and power adapters supplied by the product
manufacturer. The power cord and power adapter are intended for use
with this product only. They should never be used with any other
product.
Batteries
Batteries supplied by Lenovo for use with your product have been
tested for compatibility and should only be replaced with approved
parts.
A battery pack other than the one specified by Lenovo, or a
disassembled or modified battery pack is not covered by the warranty.
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Using the ThinkPad Advanced Ultrabay Battery II