1. Some theory
1.1. Introduction
Almost every laptop has a charging circuit of some sort, that does a few things:

• Manages switching between AC adapter and battery power
• Manages battery charging and generates power rail to charge battery

There are 2 different designs to handle switching between AC adapter and battery power and feeding the system:

• Hybrid power boost (HPB) and traditional circuits without power boost (see Warning in HPB section)
• Narrow VDC (NVDC)

Texas instrument has a nice overview of these technologies with some more details at https:...

Hello everyone

I have been working on this laptop mentioned in the title, it initially had a shorted capacitor. After I replaced it, the thing started working again, but there is still another problem. The laptop was running off a charger, the battery was reporting 96% charge... but when I unplugged the charger, the laptop died. I've measured the battery voltage - 0V. I think it is locked. (Screenshot from batterymon, below).

I've ordered a new 3rd-party battery, but I think there's something wrong with it too - the laptop boots, but the battery isn't charging. Also,...

Hello,

I have an Asus X415EA board that is not charging the battery after some liquid damage. Everything else works, except charging the battery.
So far I measured all the pins on the bq24780s controller with the following result:

1. ACN = 0.0V
2. ACP = 19.02V
3. CMSRC = 18.5V
4. ACDRV = 23.9V
5. ACOK = 5.9V
6. ACDET = 2.57V
7. IADP = 0.17V
8. IDCHG = 0V
9. PMON = ?
10. PROCHOT = 5.05V
11. SDA = 3.3V
12. SCL = 3.3V
13. CMPIN = 0.47V
14. CMPOUT = 6.0V
15. BATPRES = 0.0V
16....

Hey All!

Long time forum member here with a problematic laptop issue!

I got a RZ09-0196 with a bloated battery (still worked and charged fine) I pulled the old cell pack out and installed a new cell pack in its place.

The laptop would not power on with the new battery installed without the power supply being plugged in.

When booting into Win10 (all up to date BTW) I saw the battery icon with 49% plugged in not charging.

TL;Dr version, old battery worked, charged but was bloated, installed a new non OEM replacement, laptop/windows...

Hello. Sorry for the long post, but I am trying to decide if this is a simple battery replacement, or potentially something more complicated.

I bought an open box MacBook Air M1 2020 A2337. Seller claimed it was never used. Visually, it appears pristine.

On arrival, the battery was completely flat. Computer powers up and boots fine. Battery status showing 1% and charging, 1 cycle. coconutBattery showing 0 mAh and ~6 watts.
After some hours, the battery status did not improve. Restore via DFU did not help.

I connected the power adapter to a Kill-a-Watt...