What's your voltage at idle and driving...
 

My voltage seems to hover around 13.3 volts a lil lower at idle. Anyone getting 14v+? Trying to figure out if I have a bad battery or a bad alternator? Shouldn't it charge to 14.4?

2015 is250f edition

Welcome to the forum!

Quick question, are you having any starting or charging issues?

The specific battery voltage will depend on the test conditions...are all the lights on, high beam on, radio on, interior lights on, A/C on, engine revving slightly, or is everything off and the vehicle idling.
13.3V at idle with everything off that can be off is normal.
Once you load it up, then it should creep over 14Vs...but once again, all depends on test conditions.

The car isn't driven every day and after a few days it was sounding slow when cranked. I went ahead and got a brand new battery and it has shot up to around 13.8, this was a 2015 IS250 and it includes a group 26 battery which is a very odd sized I was unable to find anything AGM for it so I ended up getting a group 24 that fit very close a little loose in the cage though but everything tightened down