May sound like a weird question, every few weeks I only have a small commute of a mile. security is not the best, I like to have my bike in the same office as me. but I will be able to lock it behind closed and locked doors for the day. For those extra small commutes, one way is almost a pedal less down hill ride, instead of taking my battery with me, can I ride without the battery those days? Is the "banana" battery considered part of the structure of the bikes skeleton?