first off, as stated, it's not a battery that you are wanting, which is where my confusion came from....
it's a mod (the actual device)
a battery is just that, a battery like an AA, AAA, C, 18650, 20700, and so on....
what watt do you usually vape at?
as stated also, most internal battery mods aren't really going to go to 100w, for this you will need a mod that uses replaceable batteries....
is there any reason that you don't want to use replaceable batteries? From my own personal experience I have learned over the years that internal battery mods aren't that great because once that battery dies the mod is useless, whereas with external batteries, once the battery dies, just get a new one and your mod is just fine.
I vape at 20w on a 2 battery mod and it usually lasts me just about all day, just swap out the batteries for a pair of fully charged ones and i'm back to vaping, no waiting on the mod itself to charge. You can find good batteries and a charger for pretty cheap and most mods also allow for usb charging
for example, I'd recommend the Aegis Legend it's a 200w mod, fits nice in the hand, has a nice display but doesn't have much features to the menu, it's a good starter/intermediate mod and
on sale here for $51.95 and use code: GEEKVAPE10 to get another 10% off
so you're looking at $ 46.76
then go here and grab you
2x Samsung 25R's for $9.98 and on the same site go here and grab you
2x LG HD4's for $9.98
*IMRBatteries also gives you a free storage case when you buy 2 batteries and usually gives you free battery wraps as well*
and then you can pick up a 2 slot charger for under $10 just about anywhere
so you are now at about $77 for a 200w mod, 4 batteries (and 2 storage boxes for the batteries), and a charger of course then throw in shipping for all of that and we'll say you're probably at about just under your $100 mark