Here are screenshots of my results so far. Setup is at home connected to 4g network extender and Tumi battery mod connected.
The battery mod kicked in when my phone battery got to 80% and kept it at 80% for 24 hours. In fact as I'm typing this a pop-up just told me it's drained.
I'm very happy with these results. I disabled alot of the bloatware and apps and settings I don't want or don't use. Your mileage may vary. There's alot of factors that will be different but figured I would share.
Honestly I was surprised the battery mod lasted as long as it did.