yeah mine drains faster on JB. I even did a factory reset and its made no difference. Not chronic but in standby its around 1% per hour as ooposed to 0.5% per hour on ICS. I believe google now is the cause for this but leaving it on at the moment to see if its actually useful. If not I'll turn it off and hopefully get some battery life back.
I believe on JB the media scanner shows up in battery usage after a reboot as the phone scans for all media on the device. It should not continue though, so its a bug if it does.
Anyone else seeing gpsd in battery usage? I believe this is linked to google now as never seen it before JB?