{"product_id":"philips-fc8700-replacement-battery-128v-1400mah-lifepo4","title":"Philips FC8700 Replacement Battery 12.8V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips FC8700 \/ FC8710 Series — 12.8V LiFePO4 Replacement Battery (4IFR19\/66)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12.8V 1400mAh LiFePO4 replacement battery for the Philips FC8700, FC8603, FC8705, and FC8710 cordless stick vacuums. It replaces OEM part numbers 4IFR19\/66 and CP0111\/01. Fits the original battery housing directly — same cell format, same BMS interface.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFC8700 \/ FC8710 platform compatibility:\u003c\/strong\u003e\n    These models share the same 12.8V LiFePO4 cell pack, connector pinout, and BMS communication protocol. The charger handshakes with the BMS before delivering current, so the replacement cell must match the original chemistry — LiFePO4 to LiFePO4, not Li-ion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the FC8700 platform. The BMS accepted the charger handshake on the first connection, drew current normally, and cut off cleanly at full charge. No fault codes triggered during motor-load testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDock charging on the FC8700:\u003c\/strong\u003e\n    Do not leave this vacuum sitting on the dock continuously. LiFePO4 handles trickle charge better than Li-ion, but the FC8700 dock does not cut power when full. Charge until complete, then remove — this alone preserves cell capacity over months of use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSuction dropping before the battery indicator reaches low on the FC8700\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the motor draws more current than the BMS allows under sustained restriction — usually a partially blocked filter or full dustbin. The BMS interprets the elevated draw as an overcurrent event and steps down power to protect the cell, which the user feels as suction loss. The battery indicator reads mid-charge because cell voltage is still within normal range — the issue is current demand, not stored energy. Clear the filter and empty the bin before suspecting the battery.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor cutting out mid-clean and recovering after a few seconds\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a BMS overcurrent trip, not a dead battery. When the vacuum hits a dense carpet pile or a blockage, motor current spikes above the BMS threshold and the pack shuts output to protect the cells. The BMS resets automatically after a few seconds once current demand drops. If trips are frequent, the filter is likely restricting airflow and forcing the motor to work harder than rated. Clean or replace the FC8700 filter and confirm the dustbin is below the max fill line — that alone resolves most repeat cut-out complaints.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428046798938,"sku":"BWCS-PHC870VX-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428046831706,"sku":"BWCS-PHC870VX-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428046864474,"sku":"BWCS-PHC870VX-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PHC870VX_1.webp?v=1779933966","url":"https:\/\/batteryweb.com\/products\/philips-fc8700-replacement-battery-128v-1400mah-lifepo4","provider":"BatteryWeb","version":"1.0","type":"link"}