I have a magnum Ui6 bike. Should I remove the battery after every use and store the battery inside - or - do most people leave the battery on the bike and only remove it when it needs to be charged or at the end of the season for storage? I live in Toronto, Canada and use the bike from April - October. I find it difficult to put the battery in/out and am hoping it's okay to keep it on my bike and only remove it to charge or store for off-season? Thanks so much!