LMAO! "Oh Jesus Christ, I have to set my phone down which automatically charges it without even having to plug a cable in, fuck I'm just going to kill myself, this isn't worth it." *puts plastic bag over head* And you don't need a 10K mah battery to keep yourself from having to charge "every 15 minutes". 10K mah gives you 15 days, wich means 2.5K mah (pretty normal) is just under 4 days.
... I linked it: https://www.frequencycheck.com/compatibility/8bNVfAy/oukitel-k10000-lte/united-states
As it shows, you can get 4G speeds, just not LTE. From everything I've read, real world speeds on HSPA+ are the same as LTE. Only the theoretical speeds are different, not the speeds offered by carriers to users.
You still didn't read it apparently, yeah you can get some 3.5G(4g speed) with some carriers, with many you get none or only half the frequencies (so you'll have none in many places). Nor is it compatible 100% with any carrier.