I just replaced my Dell XPS 13 9350 battery after it showed signs of warping. The replacement battery in question: https://www.amazon.com/gp/product/B07CJ7NDNN/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
I was able to get it to a full charge but now I am getting a 4 Amber / 1 White flashing from the lower LED light. Furthermore, if I remove the charger, it will turn off. I checked the BIOS after startup and it shows that the battery is being detected. I'm not sure how to fix this issue.
I am experiencing the same issue with a genuine Dell replacement battery for 9350. The workaround is to disassemble, disconnect, and reconnect the battery.
The issue became more and more rare with time after the battery was replaced. Occurs especially when charging back from low battery, always after reaching 100%.
Unfortunately, based on the service tag number, the warranty has expired. You can wait for a reply from other community members or contact the Dell Out of Warranty Support Team by clicking the link below.