Ya...that's why I'm sure the 18490 will do so well. It's not much bigger than the mini and yet I simply put in one battery per day and I'm golden

Don't get me wrong, I still use my minis everyday...because I like to vape several flavors throughout my day...but this 18490 is my go to mod because of the battery.
I can second that !!!
The battery life and performance on my two 18490's is perfect. The size seems much smaller than the 18650 woodvil but performance is equal. They are quickly becoming my favorite for 4v vaping. If you put a HH357 1.5Ω atomizer on them is just an amazing device. So for me my REO lineup is as follows......
14500 minis - all sold or gifted away.
18490 midis - 2 of them with a HH357 on top at all times

18650 Woodvil / Grand - 4 of them with either HH357 1.5Ω at 4v - or - 6v with Boge 3Ω cartomizers.
For the record I just gave away all my 5v batts and charger to a good friend to step up his game a bit as well.
There are going to be a lot of happy REOnauts this Christmas
If I might add two small slightly negative points for me.
1) the button is a hair trigger and can fire off very easily for me. Just remember to use the on/off switch every time you pocket or purse it.
2) getting VG juice in that tiny opening on a 3ml bottle makes a mess some times.
Neither one is a big deal, but could be avoided if you opt for the bigger woodvil.