[product parameters]36v e-bike battery, built-in 18650 a grade 2600mah 3500mah battery cell, suitable for 350w 500w 250w motor; max constant discharge current: 20a. inches(381*167*183mm). charger: 42v 2a,discharge connector:2pins [after-sale service policy]our 36v folding bike lithium-ion battery is supported with one month return(except you order wrong battery, please double confirm which you need before booking), 12-month quality assurance [ about delivery]the electric bike battery is shipped from china , door to door and duty normally it takes 10-15 days to delivery to you. [practical designs]this 36 volt ebike battery is equipped with: 5v usb , cloud charge phine ; safe lock, prevents the battery from being stolen; dc charge port ,and 2pins output ..syi