I have a new mod from a maker by the name of Fishbone mods, I cant seem to find any information on them, but its a dna 100c board inside, and no matter what battery I use, new or old, samsung or molicell, i get a weak battery error every puff i take, the batteries are at 100%, ive updated the chip, ive reset the chip, and im at a lost as it looks like i have a 400 dollar paper weight nowin escribe under mod> battery it says its a lithium ion 18650 and no way to change it to a 21700 or maybe im just unsure how to do so, ive googled to no end and have found nothing that helps