I recently purchased a 1999 193 elite and the battery charger in it is says Champion special edition 3 bank pro. It's probably the original charger (by the looks of it) and I'm wondering if it's the kind you can leave plugged in 24/7 or not. If anyone else has this model please advise. I definitely don't want to burn up the new batteries I recently purchased. Also, how long do chargers usually last? Thanks, Darin