It takes 2 seconds to put a phone on charge I imagine taking the battery out of the EM being a real pain in the ass....
I came here to look for advice on this exact issue, I have had my EM for about a month now and only just seen that the battery can not be left below 5 degrees which is a bit of a problem for me living in the UK it is 3 degrees right now so the bike is in the house at the minute which is not convenient at all. I have not looked at how easy the battery is to remove yet so without digging all the block paved drive up and running radiators to the garage I'm a little stuck!