Ah I see. So I took a quick look at their contract and some articles, the ownership of the batteries is with Gogoro during your plan, and they give you the option to pause this plan (30 days minimum a time, 90 days max per year). If you decide to pause or cancel the plan, you will have to return the batteries you currently have, and they will give you spare batteries in return. I don't think you'll be guaranteed good batteries either way.