{"product_id":"plantronics-cs540-replacement-battery-37v-140mah-li-polymer","title":"Plantronics CS540 Replacement Battery 3.7V 140mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePlantronics CS540 \/ CS540A Series — 3.7V Li-Polymer Replacement Battery (86180-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 140mAh Li-Polymer battery for the Plantronics CS540, CS540A, Savi CS540, and Savi CS540A wireless DECT headsets. It replaces OEM part numbers 86180-01 and 84479-01. Fit the battery when the original cell no longer holds charge through a full work session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCS540 and CS540A platform fit:\u003c\/strong\u003e\n    Both the standard CS540 and the Savi CS540A variants run the same 3.7V cell on the same connector and BMS handshake — one battery covers all four listed models without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a CS540 base station. The BMS completed its handshake, the charge indicator cycled correctly, and the cell held voltage through sustained DECT radio and audio draw without triggering premature cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle base station registration:\u003c\/strong\u003e\n    After fitting the new cell, seat the headset in the base station and let it complete a full uninterrupted charge before making any calls. The CS540 base needs to log the new cell through a complete cycle before the talk-time estimate on the base indicator becomes accurate. Pulling the headset off the base early on the first charge can cause the base to misread remaining capacity for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station not recognising new pack after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe CS540 base uses a BMS handshake to confirm a valid cell is seated before it begins a charge cycle. A new Li-Polymer cell shipped at storage voltage — typically around 3.6V — can fall below the threshold the base expects at initial contact. If the charge LED does not activate within 30 seconds of seating the headset, remove and reseat it firmly, making sure the headset clicks into the cradle contacts. If the base still does not respond, connect the base to power through a different USB port or AC adapter to rule out an underpowered supply interrupting the handshake.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHeadset cutting out mid-call on a freshly charged battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe CS540 draws current simultaneously from the speaker driver and the DECT radio transmitter during active calls. On the first few cycles after a battery replacement, a new Li-Polymer cell has not yet reached its full charge acceptance, and the combined load can cause a brief voltage dip that triggers the BMS low-voltage cutoff. This is not a faulty battery — it resolves after three to five full charge-discharge cycles as the cell conditions. If dropouts persist beyond five cycles, confirm the headset firmware is current and that the talk-time display on the base is reading above 3.7V before the call starts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428109418586,"sku":"BWCS-PLS540SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428109451354,"sku":"BWCS-PLS540SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428109484122,"sku":"BWCS-PLS540SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/plantronics-cs540-replacement-battery-37v-140mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}