I hear you, I've been trying to beat the vape on a Coolcart with 5V KR808 passthru or XL batteries.
I got the eGo-T tanks system and vape is cool and flavorless, but decent volume.
Tried dripping a bunch of different 510/eGo attys on eGo-T batteries, better than tank but not KR808.
Finally dripping on 306 LR atty (Good luck so far with 2 out of 2 Ciscos and 1 out of 2 Joye's) with XL drip tip from AvidVapers (limits risk of sucking up hot juice) beats the KR808 passthru.
Pure flavor without carto poly fuzz taste, warm lung quenching vapor, and about 50% more volume. Pure VG makes a scary amount of vapor. Not for stealth vaping.
So I use KR808 on XLs or passthru in the car on the go and drip my brains out on the 306LRs at home.
Try them you'll like them.





5 vape emoticon rating from me.