Wireless Pro&reg; Premium Replacement Rechargeable 140mAh 3.7V Battery for Plantronics CS540, CS540A and CS540-XD Wireless Headsets 86180-01 PL-86180-01 & 84479-01 No more interrupted conversations when calls will now last 1.5 to 2 times LONGER than the OEM battery and recharges faster. Talk longer and close more sales! Our replacement battery is the PERFECT FIT for your Plantronics CS540 wireless headset at home or the office! Don't get cut off your next important call! Other replacement batteries aren't made of LONG LASTING Lithium Polymer and don't match up to our specifications of 140mAh 3.7v. IDEAL for: Plantronics CS540, CS540A and CS540-XD Wireless Headsets 86180-01 PL-86180-01 & 84479-02 Avoid trying to constantly recharge your headset or if it's time to get a new battery don't hesitate to click 'ADD TO CART' today! Also remember to get one for your home and another for your office headset system and rest assured as our products are back with a 1 YEAR UNCONDITIONAL Replacement Warranty!