The Toshiba DKT2004-CT & NEC DTR-4R-2 (EXP9590) Cordless Telephone Battery is a replacement battery for the Toshiba DKT2004-CT digital cordless telephone. It features 730mAh and 5.5 hours of talk time. It is used for the DKT2004-CT model. Also works with the NEC DTR-4R-2 Cordless Telephone