[After-Sale Service Policy]Our 48V Moutain bike Lithium-ion battery is supported with one month free return(except you order wrong battery, please double confirm which you need before booking), 12-month quality assurance [Shock & Water Resistance]The 48V ebike battery is made of high quality strong ABS PC shell, and meet with water-resistant IP65 level, Means you can ride in a small raining for a moments, but not too long, to make sure the battery life. [ About Delivery]The electric bike battery is shipped from chian , door to door and free duty normally it takes 10-15 days to delivery to you..syi