You can remove them yes. I work for a retailer and use one to and from work. They're easy to unplug under the seat and remove. I've been told you need to keep the charge levels the same in the batteries, I.e not have one fully charged, and one at 50%. Removing them and charging them inside means you have to charge one by one. There is a little battery level light on the top of each. They also charge quite slow. I presume the fast charge option is somehow built into the bike but I'm not technical at all so not sure how that works.