Replacement 140mAh 86180-01 84479-01 Battery for Plantronics CS540, CS540A & CS540-XD Wireless Headsets Replacement for: 86180-01, PL-86180-01, 84479-01 Batteries. Compatible with the following models: Plantronics CS540, CS540A, CS540-XD Wireless headset. (NOT compatible with other headsets including the Plantronics Savi W740, W745, CS50 or CS55). 3.7V 140mAh 0.55Wh Li-Polymer Battery. Provides up to 7 hours talk time with the CS540 headset on a full charge. 1 Year Replacement Warranty (When Purchased From MPFProducts).