About this replacement
Designed for Polycom, SpectraLink, Nortel devices. Compatible models include KIRK 5020, KIRK 5040, 5020, 5040, DECT 5020, DECT 5040, Kirk 4080, 7520, 7540, 7620, 7640, 7710. Replacement part numbers include 84743424, ICP73048, 84743428. Key specifications: 3.7V, 950mAh, Li-ion.