{"product_id":"seiko-qr-350-replacement-battery-84v-700mah-ni-mh","title":"Seiko QR-350 Replacement Battery 8.4V 700mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSeiko QR-350 Series — 8.4V Ni-MH Replacement Battery (QR-35004)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 8.4V 700mAh Ni-MH battery replaces the original backup cell in Seiko QR-350, QR-375, QR-395, and QR-6550 time clocks. It maintains the clock's real-time circuit, display, and battery-backed RAM during power outages or mains interruptions. Part numbers QR-35004 and QR-35004N are interchangeable for this fit group.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQR-350 \/ QR-375 \/ QR-395 \/ QR-6550 fit group:\u003c\/strong\u003e\n    These models share the same internal battery bay dimensions, connector pinout, and BMS handshake voltage range. The 8.4V Ni-MH chemistry matches the charge controller's trickle profile, so the onboard circuit accepts the replacement without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the QR-series charge circuit and confirmed the BMS completed a full charge without triggering a fault cutoff. Resting voltage after charge held at 8.4V, and the RTC signal stayed stable throughout the test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eData export before swap:\u003c\/strong\u003e\n    Export all employee attendance records and punch data before removing this battery. The QR-series stores time logs and employee enrollment data in battery-backed RAM — full power removal wipes that memory with no recovery path.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the QR-350 loses all employee data after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe QR-series keeps attendance logs and employee enrollment records in volatile RAM, not flash storage. That RAM stays alive only while the backup battery holds voltage above the memory retention threshold — typically around 3V per cell in the stack. The moment you pull the old battery and the voltage drops, the RAM loses power and clears. Reinstalling a fresh battery restores clock function but cannot recover the erased data.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eClock shows correct time on screen but punches are stamping the wrong time\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom usually means the RTC drifted during a low-battery period before the swap. The display can show a cached time value while the RTC oscillator runs slow or resets to a default timestamp. After fitting the new battery, go into the clock's time-set menu and confirm the RTC register matches your reference time — do not assume the displayed time is already correct. Resync to a wall clock or NTP source and log one test punch to verify the stamp before returning the unit to employees.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426139504730,"sku":"BWCS-LTM750SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426139537498,"sku":"BWCS-LTM750SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426139570266,"sku":"BWCS-LTM750SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LTM750SL-1.webp?v=1779930385","url":"https:\/\/batteryweb.com\/products\/seiko-qr-350-replacement-battery-84v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}