[ fast divery]the electric bike battery is shipped from ca, us warehouse, normally it takes 2-7 business days to delivery to you. [after-sale service policy]our battery is supported with one month return(except you order wrong battery, please double confirm which you need before booking), 12-month quality assurance [product parameters]built-in 18650 a grade 3500mah battery cell, suitable for 500w 750w 1000w motor; max constant discharge current: 30a. size: 18.1*4.09*3.1 inches(460*104*80mm). charger: 54.6v 2a/3a, charge time 6-7 hours; discharge connector:5 holes(male&female side); [practical designs]this 48 volt ebike battery is equipped with: led power indicator, inform you charge the battery in time; safe lock, prevents the battery from being stolen; usb port, charge mobile phones or other electronic devices when you are outdoor. with base , easy to install..syi