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BQ21040: 没用多久就充不了电了

Part Number: BQ21040

充电电流500ma.  电池2200mah。问题:充电时,芯片升温很快,几秒就能感觉到手指有些烫,使用几个月后个别芯片就会出现不充电现象。100个里面有5、6个的样子。