For best use, plug the charger into the device (electric bike) before plugging into the wall. Any other method can result in early plug degradation due to charging spark. Using ANY fast charger on any battery WILL degrade your battery quicker. To prolong the usable life of your battery, you should try to avoid using this charger as your main charger. This charger is best used when you are on the go and you should use your stock charger when charge time is not important. Use of the name Super73 is for purposes of identifying the application of this product and does not indicate any affiliation, endorsements, license or other association with Super73