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BQ40Z50R2 PRES引脚悬空的情况下,为什么万用表量接近于0v?

PRES 引脚内部有上拉,外部接小于20k的电阻,确保 battery在线。。。。

我现在去掉外部下拉,,,PRES 悬空,,,battery 也确实是离线状态,充放电MOS关闭。

但是为什么 此时量 pres 引脚还是接近于0v?    不是应该内部上拉,量到高电平才对的啊