You're right ! i tried 2 batterie ... a Ccell M3 Plus who was a hi and low but the voltage was not enought for the Raw Delta9 i smoke. So i change for a Yocan Lux plus whit more heat options and at 4.3 volt it's just perfect !
Standing the vape pen straight up and down/mouth piece up helps keeps the cart from clogging. Hard core I take the cart syringes that refillable a cart and heat it with a lighter and squirt some on my weed in the dry herb vaporizers. Maybe the best tasting way to vape that I know of ......