So I've been experiencing this for awhile n don't know if its normal, here it is... Fill blank carto with normal juice, use it on a fresh battery n tastes great, while keeping it moist all day and maybe mst of next day taste is good, when I switch to a freshly charged battery i immediately have a burnt carto taste in my mouth, I've had cartos last me a whole week, is this normal, and whats the best cleaning boiling method out there?