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BQ25792: DC充电充满状态判定

Part Number: BQ25792

我司设备采用4S电池,使用DC充电发现下述情况

1.DC 20v  系统充电正常

2.DC12V/15V/18V 

系统开机充电,电池电压充电至16.750V左右,电池充电电流为100MA左右,会一直保持充电状态

若此时关机,系统会瞬间充满(VSYS电压和VBAT电压相同)

此时这个跳变会影响我司电量计的正常工作

a.能否说明下DC升压充电最高电压VSYS是否是固定值,且电压是多少

b.能否描述下充满的判断依据

c.DC供电时降压供电(20V)和升压供电(12V/15V/18V)的区别