You are 100% wrong ....why would you not actually take 5 minutes and see how easy it is to remove the battery?
Let me tell you that it takes 30 seconds to remove ... There are three tie down bolts to remove the pack. It cannot be made any easier in my opinion.
Secondly, let me just give you quick 101 .... Lithium based batteries generally have no problem to be stored in low temps (hence you see EV cars stored outside in -20C, yet they continue function without a problem). They will not degrade because of it. But .... if one day you hop on a bike and start riding when it's less than +10C outside, and you do it often enough, over time, the battery will suffer from degradation after all. So, you can keep it outside, but bring it inside, so temp rises to above 10C, ideally 20-25C, the night before you ride .... that's all.