Hi mate, I also had this issue roughly the same time that you created this thread and I am wondering if the most recent firmware update has caused the issues. My Arlo Ultra camera wasn't charging and when i managed to clean the contact on the camera, the app was not correctly reflecting that the device was charging and after some time the battery meter would jump from 1% to 16% to 40% etc and not show the real time charging.
I am also having an issue where the camera is only charging to 60% and then not charging any more, are you facing this issue? If so, let's push Arlo to review their latest firmware.
Oh and forgot to mention that Arlo support ASSUMES that you have spare batteries on hand? I don't buy a product and then buy spare products just in case. We bought the product and assume it'll work as we expect.
Glenn from support asked me to "try a different battery". I am not buying another camera or battery.