{"product_id":"zoom-q8-recorder-replacement-battery-37v-1800mah-li-ion","title":"Zoom BT-03 Q8 Recorder Replacement Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZoom Q8 Recorder — 3.7V Li-ion Replacement Battery (BT-03)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1800mAh Li-ion cell built to replace the BT-03 battery in the Zoom Q8 portable audio-video recorder. The Q8 uses this cell as its sole internal power source for simultaneous high-resolution audio and video capture. Fit model is the Q8 Recorder only — confirm your unit before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQ8 Recorder compatibility:\u003c\/strong\u003e\n    The Q8 runs a single-cell Li-ion architecture at 3.7V nominal. The BT-03 footprint — 53.00 × 35.20 × 10.90 mm — is specific to this chassis. Swapping in a cell outside that voltage rail causes the onboard BMS to reject it immediately.\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 and discharge cycles on the Q8 body. The BMS accepted the cell without a fault flag, and the charge circuit tracked correctly through to termination. No thermal anomalies were recorded during high-bitrate video capture sessions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge cycle on the Q8 body:\u003c\/strong\u003e\n    Run one complete charge cycle inside the Q8 using the OEM USB connection before your first recording session. The Q8's battery-remaining indicator calibrates its threshold map during this cycle — skipping it causes erratic percentage readings on screen during early use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Q8 battery percentage jumps erratically after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Q8 maps its battery indicator against a fixed voltage-threshold table stored in firmware. A fresh cell has a slightly different discharge curve than a worn original, so the indicator can jump — showing 80%, then 95%, then 60% within minutes. This is not a faulty cell. The BMS recalibrates this mapping after one or two full charge-discharge cycles completed inside the recorder body. After that, the percentage readout stabilises and tracks accurately against the 3.7V nominal curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eQ8 showing dead or no-battery indicator on a known-good replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Q8 displays a dead-battery icon immediately after fitting a new BT-03 cell, the most common cause is a BMS deep-discharge lockout on the replacement cell. Cells can sit in storage and drop below the 2.5V recovery threshold, triggering a protection latch. Connect the Q8 to USB power and leave it for 15–20 minutes without powering on — this allows the charge IC to trickle-charge the cell back above 2.8V and release the latch. If the indicator clears after that, proceed with a full charge cycle before use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333670010970,"sku":"BWCS-ZM800MC-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333670043738,"sku":"BWCS-ZM800MC-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333670076506,"sku":"BWCS-ZM800MC-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZM800MC-1.webp?v=1778213032","url":"https:\/\/batteryweb.com\/products\/zoom-q8-recorder-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}