{"product_id":"amazon-kindle-fire-7-replacement-battery-37v-2950mah-li-polymer","title":"Amazon Kindle Fire 7\" ST18 Replacement Battery 3.7V 2950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAmazon Kindle Fire 7\" 7th Generation — 3.7V Li-Polymer Replacement Battery (ST18 \/ 58-000177)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2950mAh Li-Polymer battery replaces the original cell in the Amazon Kindle Fire 7\" and Kindle Fire 7th Generation 2017 (model SR043KL \/ B01GEW27DA). It matches the original form factor at 96.95 × 85.15 × 3.00mm and uses OEM part numbers ST18, ST18C, 58-000177, GB-S10-308594-060L, and MC-308594. Direct swap for a degraded or non-charging factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKindle Fire 7 and 7th Gen 2017 fitment:\u003c\/strong\u003e\n    Both the standard Fire 7 and the 2017 refresh share the same 3.7V single-cell architecture, connector pinout, and BMS handshake — which is why one cell covers both generations. The fuel gauge IC communicates over the same line; no firmware difference affects compatibility.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Fire 7 7th Gen unit and confirmed the BMS accepted charge immediately, voltage held stable at 3.7V nominal under display-plus-WiFi load, and no protection cutoff triggered during normal operation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after installation:\u003c\/strong\u003e\n    After fitting the new cell, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. This single full cycle recalibrates the fuel gauge IC against the new cell's actual capacity and clears the inaccurate percentage readings that typically appear after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eKindle Fire 7 shutting down at 15–25% remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is calibrated to an aged cell with a steep voltage drop at the low end. The new cell has a flatter discharge curve, so the gauge misjudges the remaining capacity. When the display backlight and WiFi radio both draw current simultaneously, the combined load causes a voltage dip the BMS reads as a cutoff threshold. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the calibration and eliminates the early shutdown.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not available after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Kindle Fire 7 uses a proprietary charge negotiation sequence that runs one accepted charge cycle before the charge IC recognises the new cell's parameters. Plugging in after a cold swap often results in standard 5W input rather than the faster rate. Use the original Amazon power adapter — third-party adapters may not complete the negotiation handshake. After one full charge cycle with the Amazon adapter, fast charging resumes at the normal rate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43425844691034,"sku":"BWCS-ABD043SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43425844723802,"sku":"BWCS-ABD043SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43425844756570,"sku":"BWCS-ABD043SL-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ABD043SL-1.webp?v=1779929950","url":"https:\/\/batteryweb.com\/products\/amazon-kindle-fire-7-replacement-battery-37v-2950mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}