Well Bikenstein,I have a 20 watter that was given to Me from the local vape shop....I am new on here and joined because I quit smoking 30 days ago as of today!!! with a Zigzag e cig(ego type,ZZ branded) and not knowing about the "World of Vaping" I looked at some vids on Y/T and got the box mod bug...I was on a mission to find spare parts for some builds and was making the rounds asking for dead batteries to use and one Guy gave Me the 20 said it wont turn on....so...If its broke,and free.... I opened it up and replaced the battery with a radio shack 18650,not knowing better,the old batt was wired in so I did the swap and put it back together and it worked!I only had the clearomizers to run on it so I puffed on it all day!....up and down worked in both modes....Then more study on batteries and a few posts about bad things happening I started worrying about the wrong battery, removed that battery and bought a efest 2500 mAh and hard wired it in and it was alive again!...The battery was charged when I did the swap and it lasted two days of puffin' then I ran it down till the lock screen came up,tried to charge it and it would not take one...So apart again....I'm getting good at it now!....I carefully placed it on My charger and charged it up, then back together...Again...For two more days of use...Got tired of that quick and went back to the shop that gave it to Me and bought a 30 watt job in blue!....So I'm going to do an "I'gorE'stick"....Pic to come asap....Vapercatz....