{"product_id":"remington-r9-replacement-battery-37v-700mah-li-ion","title":"Remington R9 Replacement Battery 3.7V 700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRemington R9 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh lithium-ion cell that replaces the original battery in the Remington R9 electric shaver. It restores cordless operation when the existing cell no longer holds a charge. Fits the R9 rotary shaver platform specifically.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR9 platform fit:\u003c\/strong\u003e\n    The R9 uses a single cylindrical Li-ion cell at 3.7V nominal. The BMS in the shaver monitors cell voltage directly — swapping in a cell outside that voltage window triggers a protection fault. This replacement matches the original voltage and physical dimensions (49.60 × 15.00 × 14.10mm) so the BMS handshake completes correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the R9 shaver platform. The BMS accepted the cell without triggering low-voltage lockout. Charge acceptance was clean across the full 700mAh capacity with no thermal anomalies at the housing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCharging port care for the R9:\u003c\/strong\u003e\n    The R9 is used near water. Dry the charging port completely before connecting the charger — moisture bridging the contacts causes a BMS protection trip the device reports as a dead battery, not a charging error. A few seconds with a dry cloth before docking prevents this entirely.\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 R9\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost R9 users charge the shaver overnight after a single daily use — often before the cell is meaningfully depleted. Li-ion cells cycled repeatedly through shallow charge windows develop a narrowed effective capacity over time. The cell's state-of-charge tracking drifts, so the indicator reads full while actual delivered capacity is lower. Replacing the cell resets this — but resuming daily partial-charge habits will repeat the pattern within 12–18 months.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eShaver motor speed dropping before the indicator shows low\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe R9 motor draws a spike of current at startup and again when cutting through thicker hair. A degraded cell cannot hold voltage under that load — it sags below the motor's operating threshold before the BMS would normally trigger a low-battery cutoff. The indicator still shows partial charge because resting voltage recovers between cuts. If the motor audibly slows mid-use while the indicator reads above empty, the cell's internal resistance has risen and replacement is the fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416129601626,"sku":"BWCS-ICR14500NF-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416129634394,"sku":"BWCS-ICR14500NF-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416129667162,"sku":"BWCS-ICR14500NF-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ICR14500NF-1.webp?v=1779760423","url":"https:\/\/batteryweb.com\/products\/remington-r9-replacement-battery-37v-700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}