Finally figured out my atty & clicked the purchase button on my 1st Reo LP, yay! One question, I have a Sony Vtc5 & Efest 2500 mah both flat top. I know the recommended ones are AW IMR 1600 mah. Do button top work better then flap top or vice versa? Also, why not the 2,000 mah or even the protected which is over 3000 mah? They would last WAY LONGER RIGHT? Do they help performance as I vape under 1 ohm? W/ Sony 5's hard to find, what's next best thing or what do you all use? TY, can't wait to get my Reo!