Hello, sir. Thanks for your feedback. First,all functions have been tested and there were no problems. The speed shown on the dashboard is the restricted speed. Different countries' customer request different. It's very easy. You can unlock it by yourself. Bulk production, it can be customized as your need. I've already sent you the unlocking method. Second,the part of the wire harness is made of insulated and waterproof wire harness, so it won't cause a short circuit. Third,the batteries are brand-new and unopened. Before sending them to you, we've already sent you photos of the packaging. Finally,all of your requests will get our response. Any questions pls feel free to let us know.