https://www.scmsinc.com/lectrosonics-ifbr1b-fm02-replacement-battery-door-kit.html
Lectrosonics IFBR1B-FM02 Replacement Battery Door Kit
Compact UHF IFB receiver with 8+ hour rechargeable battery, rugged aluminum housing, LCD interface, and 10 frequency presets for professional broadcast use.
replacement batterylectrosonicsdoorkit