9.6V 2000mAh NiMH REPLACEMENT BATTERY FOR TYCO FAST TRAXX - MightyMaxBattery
Tyco R/C: Assault with a Battery - Wikipedia
Dr Richard Nock on Twitter: "Rebuilt a Tyco 6v battery pack with a friend last night. 24 year old NiCd cells had leaked and rotted one of the contacts. Replaced with 2.3Ah