The Civilized Cycles battery pack is covered by a prorated warranty for a period of three years: During the first year of service (based on the date of purchase), a defective battery pack will be repaired or replaced at no charge to the customer During the second year of service, a defective battery pack will be replaced for 1/3rd the cost of a new replacement battery pack During the third year of service, a defective battery pack will be repaired or replaced for 2/3rds the cost of a new replacement battery pack This prorated battery warranty will be null and void under the following conditions: The battery pack has been damaged due to physical misuse and/or abuse by accident, exposure to excessive moisture, extreme heat, cold or harmful chemicals  The use of any battery charger not supplied by Civilized Cycles Unauthorized opening or tampering of the battery case Service not performed or authorized by Civilized Cycles Modification of pre-programmed firmware, software and/or control parameters in the battery management system Use of the battery pack for any application other than use in The Civ electric bicycle and to power a USB device via the integrated USB ports NOTE:  Non-functional batteries can only be diagnosed by Civilized Cycles or by a designated battery repair shop. Batteries will be repaired or replaced on an exchange basis.