PB-21hi : 7.2v NiCd insert for Kenwood PB-21H
$ 25.95
PB-21hi : 7.2volt 700mAh replacement rechargeable Ni-Cd insert for the old Kenwood PB-21H battery pack (the big wraparound battery for the old TH-21A, TH-21AT). You will need to open up the old pack (it unscrews open), remove the old insert, and solder this one into place.