M-256E: Replacement Batterry July 28, 2023 01:10 Updated Follow The Part number for the battery for the M-256E card is CR-2016. These can be obtained at electronic stores, as well as the Roland Parts department. Related articles TD-7: Backup Battery Low Message JV-80 JV-90 JV-880 JV-1000: Performance Part On/Off SysEx Messages U-220: Playing the Demo Songs D-70: Initializing - Restoring the Factory Settings D-70: Technical Specifications