upower is reporting really odd stats for battery charge time

I virtually discharged my Lenovo ideapad y580 today, it then sat there charging for 5 ish hours. However upower shows the battery at 86% and say 12:47 to complete the charge. Unplugging the power and then plugging back in said :37 but then this has been climbing since and is back upto 2:10.

ogra_ reported seeing similar things on his n7 with the upgrade to raring and also on his chromebook.

If you need any info just let me know what.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: upower 0.9.19-1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-8.17-generic 3.8.0
Uname: Linux 3.8.0-8-generic x86_64
ApportVersion: 2.8-0ubuntu4
Architecture: amd64
Date: Thu Feb 28 19:13:39 2013
InstallationDate: Installed on 2013-02-13 (14 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130213)
MarkForUpload: True
SourcePackage: upower
UpgradeStatus: No upgrade log present (probably fresh install)