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BQ76930+BQ78350充电问题

Other Parts Discussed in Thread: BQ76930, BQ78350

电池本来就没什么电了,过了一个长假期,电池电压只有几伏,BQ76930没有2.5V输出,BQ78350无法工作,现在使用外部电源充电,充不进去,好像BQ76930没有工作的样子,怎么解决这个问题呢,我使用BQ76930+BQ78350组合,6串电池,先不考虑板功耗大问题,产品有可能会存放几个月,还是会有这个问题出现,请教下怎么找到问题所在,谢谢!