- Capacity: 700mAh - Ni-MH Battery - Compatible Model: Nortel 7420, 7430, 7439, 7449, Polycom KIRK, KIRK 3040, KIRK 4020, KIRK 4040 - Compatible Battery Part Number: NT7B65KL, NT7B65LD - RoHS approved for toxic free. - CE and ISO9001 Certificate for quality assurance. Battery Distributor: Digi-Tech