The old broken battery has the battery model specification IXNN4002B. On the net you can find battery model specifications with IXNN4002A, which should fit the devices TLKR-T3 TLKR-T4 TLKR-T5 TLKR-T6 TLKR-T7 TLKR-T8 XTR446. I have ordered, am confident and will post my finding then.