Answer to the question: Will the battery for the Plantronics CT14 work in my discontinued Plantronics CT12? Will the CT14 battery work in a CT12 remote? Unfortunately they’re not compatible and interchangeable. Although the Plantronics CT12 and Plantronics CT14 systems look alike, they do use different batteries. The CT14 battery ( part # 81087-01 ) is much smaller than the CT12 battery (part # 63421-01 ) , not just in physical appearance, but … Continued