{"product_id":"philips-hq9190-replacement-battery-37v-750mah-li-ion","title":"Philips HQ9190 Replacement Battery 3.7V 750mAh 036-11290","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips HQ9190 \/ HQ9160XL \/ HQ9170XL Series — 3.7V Li-ion Replacement Battery (036-11290)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion battery rated at 750mAh (2.78Wh), built to replace the original cell in Philips rotary shavers. It fits the HQ9190, HQ8894, HQ9160XL, HQ9170XL, and over 180 additional Philips shaver models sharing the same battery format. When the original cell loses capacity after repeated charge cycles, this replacement restores the shaver to full operating condition.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHQ9000-series platform fit:\u003c\/strong\u003e\n    These models share a common 3.7V single-cell architecture with identical connector orientation and BMS handshake protocol. Swapping the cell does not require firmware re-pairing — the shaver's charge controller reads cell state directly from voltage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge cycles on an HQ9190 chassis and monitored BMS cutoff behaviour at both ends of the voltage window. The protection circuit tripped cleanly at the expected low-voltage threshold with no false cutoffs under motor load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eWaterproof model charging port care:\u003c\/strong\u003e\n    Dry the charging port completely before connecting to the charger after rinsing. Moisture bridging the charging contacts causes the BMS to trip into protection mode — the shaver reports this as a dead battery rather than a charging fault.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from daily partial charging on the HQ9190\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost users charge this shaver on the dock each morning before the battery reaches a meaningful discharge depth. Li-ion cells cycled repeatedly between 80–100% without full depletion lose calibration between the fuel gauge circuit and actual cell capacity. Over months, the indicator reads full while the cell can no longer sustain the motor under load. Replacing the cell resets this drift — the new cell and the charge controller re-calibrate over two to three full discharge-charge cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor speed dropping before the low-battery indicator activates\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe rotary head motor draws a surge of current during thick beard passes that the degraded cell cannot sustain without voltage sagging below the motor's operating threshold. The BMS cutoff is set lower than the motor's minimum voltage, so the shaver slows or stalls before the indicator ever shows empty. This is a cell-level problem — the internal resistance of an aged cell climbs high enough to cause voltage sag under load while the resting voltage still looks acceptable. Check resting voltage with a multimeter: anything below 3.5V after a full charge confirms the cell needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416134647898,"sku":"BWCS-PHQ190SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416134680666,"sku":"BWCS-PHQ190SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416134713434,"sku":"BWCS-PHQ190SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PHQ190SL-1.webp?v=1779760424","url":"https:\/\/batteryweb.com\/products\/philips-hq9190-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}