It's best to take the cartomizer off the battery before topping it off just in case there is any spilling. Wouldn't want to get juice on the battery, even if you are being careful, it can happen.
It's best to remove it as overfilling can result in a big mess. Besides it only takes a few extra seconds. That being said, I'll sometimes top off while my carto is still attached, but only a few drops so I don't overfill.
I started off by re-filling cartos and the biggest issue is that you don't know when they are going to go bad and lead horribly which could mean ruining a $18-28 battery for a $1.25 carto. I'd say, even if you can.........you probably don't want to.
I leave my cartomizers attached while refilling all the time. After using them for almost 2 years it just kind of became a no biggie. It's probably best to take them off first. Getting e liquid in your battery isn't good
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