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BQ24650锂电池充电电路问题

原理图见下方。

这个电路充电电流0.8A,充电电压13.6V,在给铅酸电池充电时,一切正常,先是恒流充电,当电压上升到13.6V后,转为恒流充电,电流下降到将近80mA时充电停止。

换成锂电池调整R20/R29的阻值后,充电电流还是0.8A,充电电压14.4V,前面恒压充电时一切正常,但电池电压上升到14.4V后,转为恒流,当电流下降到0.6A左右,充电就停止了,理论上来说恒流充电过程应该还没有结束。