Yep, you need a new battery. Getting one from Dell is harder than actually replacing it.
USB-C as a power connector work great when the proprietary power supply die as you are waiting to get a replacement battery. (true story) (I have a 9360 model, which doesn't like the batteries for the 9350)
USB-C as a power connector work great when the proprietary power supply die as you are waiting to get a replacement battery. (true story) (I have a 9360 model, which doesn't like the batteries for the 9350)