{"product_id":"neffos-c9-max-replacement-battery-385v-2850mah-li-polymer","title":"Neffos C9 Max Compatible Battery NBL-40A2950 3.85V 2850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNeffos C9 Max \/ TP7062 — 3.85V Li-Polymer Replacement Battery (NBL-40A2950)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V Li-Polymer cell rated at 2850mAh (10.97Wh), built to the NBL-40A2950 specification. It fits the Neffos C9 Max (TP7062) and replaces an original cell that no longer holds a charge or shuts down unexpectedly. Dimensions are 77.90 × 59.20 × 4.00mm — verify against your current cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC9 Max and TP7062 fit:\u003c\/strong\u003e\n    Both models use the same battery bay, connector pinout, and BMS communication protocol. The NBL-40A2950 part number covers both variants — same voltage rail, same cell footprint, same charge IC handshake.\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 a test unit. The BMS accepted a standard 5V\/2A charge without error flags, and protection cutoffs triggered correctly at both ends of the voltage window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after fitting, disable fast charging and complete one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before fast charging pushes higher current into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Neffos C9 Max after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still reading the old cell's discharge curve. The new cell hits a voltage cliff under modem or display load — the phone sees the voltage drop and shuts off before the reported percentage reaches zero. It is not a fault with the replacement cell. One complete discharge-charge cycle at standard current recalibrates the coulomb counter. After that cycle, shutdowns below 30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS reporting a wrong or jumping battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the C9 Max stores a learned discharge model for the original cell. A new cell with a different internal resistance profile will cause the reported percentage to jump or stall — commonly around 50% or on the way down from 80%. This is a calibration gap, not a defective cell. Force a full discharge until the phone powers off on its own, then charge uninterrupted to 100%. One or two cycles like this resets the IC's tracking to the new cell's actual curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391921848410,"sku":"BWCS-TPC910SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391921881178,"sku":"BWCS-TPC910SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391921913946,"sku":"BWCS-TPC910SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TPC910SL-1.webp?v=1779142694","url":"https:\/\/batteryweb.com\/products\/neffos-c9-max-replacement-battery-385v-2850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}