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BQ24133导致锂电池鼓包?

Other Parts Discussed in Thread: BQ24133

这边采用BQ24133+2节锂电池(8.4)做POS机的后备电源,由于POS一直有外部电源供电,现在4个月过去,发现锂电池有鼓包现象!

锂电池厂家说我一直外部电源供电,导致的,这个说法正确吗?难道24133不能当备用电源充电使用???