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x220 battery information:
### ThinkPad x220 batteries by FRU Number List of FRU's from the x220 Hardware Maintenance Manual # 4 cell 2.0Ah `42T4899` `42T4901` # 6Cell 2.8Ah `42T4861` `42T4865` # 6 Cell 2.8Ah 47+ `42T4873` `42T4875` # 9 Cell 2.8Ah 47++ `42T4940` `42T4942` # Slice battery `42T4903` Link for Lenovo Battery Recall details and battery test software https://support.lenovo.com/gb/en/solutions/hf004122