woke up this morning around 3:30am, noticed phone was blinking red led and showing low battery warning, even though it was plugged in. unplugged and replugged and instantly went back to 100%. checked system updates in settings and it was downloading the ota and seemed to be stuck around 75% done. was considering whether to pull battery, but it eventually finished within about 30 minutes after i noticed it. then i got the popup to install and it worked fine. no problems.