When battery only, BATSRC is 16, BATDRV is 21, so BATFET is on. plug in the power adaptor, the BATDRV changed to 16v, so the BATFET is off.
Maybe the battery is bad or adaptor?...

My bad, the ACDRV is 19v. BATSRC, Connect to the source of N-channel BATFET. BATDRV voltage should be 6 V above BATSRC to turn on BATFET. I got 15.45v for both, the battery vintage, so the BATFET is not on.​

datasheet for bq24780S
​
BATSRC: 17 Connect to the source of N-channel BATFET. BATDRV voltage is 6 V above BATSRC to turn on BATFET.

BATDRV: 18 Charge pump output to drive N-channel MOSFET between battery and system (BATFET). BATDRV is shorted to BATSRC to turn

off BATFET.
​

I am trying to fix a Acer Nitro 5 AN515-57-536Q not charging issue, the laptop can boot from battery, adaptor or both. The battery LED is solid orange, but it doesn’t charge. The battery report from win11 looks normal, the acer care
report is also good for battery.

Following https://www.badcaps.net/forum/troubl...arging-circuit,

• DCIN/VCC: 19.1
• ACIN/ACDET: 3v
• REGN/VDD: 6v
• CMSRC : 19v
• ACOK: 3.3v
• ACDRV: it is 19v, not 25V(when charging, the ACDRV

...