FEATURES: Battery for RC Quadcopter JD509 509W Pioneer UFO. Package including: 2 x Battery. 3.7V 600mah Lithium battery 100% Brand New, practical and durable for long-term use. Original Accessories, Quality Guarantee. AFTER-SALES SERVICE: *Please feel free to contact us by email directly before you leave review when any problem happens to you.* Problems you might encounter, include but not limited to: 1. Total or partial broken when get the product or after using few days. 2. The product doesn't appear to the functioning or you don't know how to operate the product. 3. Products arrive less than or not what you've ordered. 4. Any other problem that happens to you. *Please feel free to contact us by email for help immediately. * *No matter how serious the problem is, we will try our best to help you fix the problem, and make you satisfied with our service, don't worry.* 5. All emails will be replied in 24 hours, we will deal with your problem as soon as possible.