Should I replace my battery cause currently it's not charging

I realize this isn't exactly a timely answer, but I just encountered a similar issue on my Pixel 6 Pro.

Last night, I was sitting down on my phone doing my usual activities when it suddenly turned off. No matter what I did, I could get no reaction from the phone whatsoever.

I tried:

• Hard Reset (hold power button for 30 seconds)
• Restart (power and volume up for 20 seconds)
• Fastboot (power and volume down for 20 seconds)
• No reaction when plugged into charger
• No reaction when placed on wireless charging pad
• Not recognized when plugged into computer
• Rubbing the phone didn't help
• Tapping the phone didn't help
• Slapping the phone didn't help
• Freezing the phone didn't help

When plugged in with a USB ammeter, it jumps to 1.2A for about 2 seconds, the quickly drops to zero. The charging puck shows a .2A draw without a phone on it. The current goes up to .4A when the phone is placed on it and the light changes color indicating it's recognized that a phone is on it, but seems to have no effect on the phone.

I tried multiple chargers and multiple cords with no difference.

Fortunately, I had another Pixel 6 Pro I had been fighting with to get the fingerprint sensor working (with no luck), so I had a parts donor phone available. I opened them both up and swapped screens; no joy. LIkewise with the battery; mine worked perfectly in the other phone, but the other battery didn't help.

So I took the ultimate step and swapped motherboards. My phone came up and worked perfectly with the donor motherboard, and the donor phone now was dead.

As a result, I can now be 100% certain it's a motherboard issue since I now have a fully operational phone using a replacement motherboard. I doubt I'll pursue any further fixes on the original motherboard, but if by some chance I came across a set of schematics and boardview files for that phone I might be tempted to do some troubleshooting. It's not easy since the darn thing is literally covered with shields on virtually all of the chips, but we'll see.