Precautions in selecting mobile phone batteries (1) There is no dirt and scratches on the surface of the battery case. (2) The battery contact piece has a good appearance, and there is no imagination such as rust and coating falling off. (3) Start the experiment. The nominal cell phone battery voltage should be consistent with the cell phone voltage. (4) The battery and mobile phone should be fully equipped, with moderate tightness and no blockage. (5) The battery must be used normally, for example, it can be turned on normally on the mobile phone and charged and discharged normally on the charger. (6) Put the battery into the mobile phone and turn it on. Shake the battery vigorously. If it is turned off, it means that the battery is in poor contact with the mobile phone. (7) There should be relevant official documents, which can clearly explain the model and capacity of the battery. (8) Try to choose dealers with good reputation and get their clear after-sales service commitment. (9) Check the anti-counterfeiting mark and confirm it to prevent counterfeiting.