The IRL3103 has a RDS on from only 12mOhm = 0,012Ohm.
The maximum Voltage lost when your atty need 2A is only 0,024V.
When you say, that only 2,7Volt are on the atty, then you have problems with contacts or battery.
I belive, that your AAA Batteries cannot power 2A. I' shure!
Make the same voltage test by shortcircuit the FET between Drain and Source or hold the battery direct to the atty
Thanks Raidy,
I think you didn't understand my post, I'm wondering if there's a lost of voltage or not with your circuit, that's because the guy of the video said so, but I just get 2 of those IRL3103 from the net, and I don't like HV mods, just the easy ones (one battery). And I'm not using AAA batterys, I'm using a single 18650 3.7V. But thanks anyway.
My friends from Mexico are jealous, just because I'm modding something that a german specialist develop. They say that I'm just a rookie and you sir are the most ingenius man when talking about ecig, genesis or vaping.
Oh when you come to America, you are invited to Mexico, I'll be your faithful guide. I'm from Guadalajara, is a beautyful city, 6 hours near from the central pacific coast of my country. You'll love the view and the weather.
Regards
Mojito
P.S.: A free 24 pack of beer (CORONA, ESTRELLA, or any Mexican Beer you desire) is yours if you come to visit us. Besides your have a place to stay just right in my hometown.