IBM FRU-42T4556 Tips
1) To maintain the optimum performance of the IBM FRU,42T4556 ASM,42T4557 , it is highly recommended to circle (fully discharging and recharging) it at least once a month.

2) It is normal if a new FRU,42T4556 ASM,42T4557 battery gets warm when being charged or used. However, please pay special attention if the battery pack becomes excessively hot. This may indicate there is a problem with the charging circuit of the electronic device. Please consult a qualified technician if necessary about IBM FRU,42T4556 ASM,42T4557 .

3) How long can FRU,42T4556 ASM,42T4557 laptop battery last? Please compare with your battery's capacity, for example, 4400mah may have double running time than 2200mah (actual running time may different depends on the program using on your computer). The higher the mAh rating, the longer the battery will hold its charge between charging cycles.

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