I have a tugboat mod and it's extremely amazing...
except the goddamn 510
(if you screw in the atomizer slightly tight, it will back out the whole 510 when you unscrew the atty.. and you need to use your fingers to get the hex nut tighten and the 510 seated flush... it's mostly a problem with shitty glue from factory on my 510... super glued it myself and that problem is gone..)
My mod has a really clean interior... the wires are soldered on nicely and everything is sealed up seamlessly
The mod hits hard.... so it's either the batteries are bad.. or your charger isn't actually charging them to their max nominal voltage of 3.7v (+/- 1v)
Both my batteries are fully charged in roughly the same time as eachother... using married LGHE4's and the difference between them would be 4 minutes at most
Love this mod but it takes some DIY on the 510 to prevent some issues there..
Would love to see a modder add a voltmeter and a potentiometer to it...
It's a shame it doesnt have voltage regulation.... would've made a great hexohm alternative