7733 replacement battery for 7700/7740 Isotip models this battery is for the gray, orange or black quick charge soldering irons only description for current production of quick charge models # 7700, # 7740 and # 7750. this battery is for the gray, orange or black models only. *please note, as of December 2017, all #7733 batteries are a black shrink wrap rather than the white. 2.4 volts 1300 mah 3.25 length 7/8 diameter black wrap recharges in three to four hours two terminals for soldering into the unit 00043917773537 043917773537