{"product_id":"tp-link-neffos-c9-max-replacement-battery-385v-2850mah-li-polymer","title":"TP-Link Neffos C9 Max NBL-40A2950 Compatible Battery 3.85V 2850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTP-Link Neffos 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, 2850mAh Li-Polymer cell for the TP-Link Neffos C9 Max (model TP7062). It replaces the original NBL-40A2950 battery when the factory cell no longer holds charge or fails to power the phone. Dimensions are 77.90 × 59.20 × 4.00mm — verify against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNeffos C9 Max \/ TP7062 fit:\u003c\/strong\u003e\n    Both model references share the same chassis dimensions, connector pinout, and charge IC handshake. One cell covers both variants without any modification.\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 bench, confirming BMS cutoff triggers correctly at low voltage and that the charge IC accepts the cell without flagging an incompatible battery error.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points.\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 replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh Li-Polymer cell has a slightly different voltage-versus-capacity curve than the aged cell the fuel gauge IC was trained on. When the phone hits a high-draw moment — mobile data handoff, screen at full brightness, GPS active — the new cell's voltage dips sharply below the threshold the IC expects at that reported percentage. Android interprets this as a critical voltage event and forces a shutdown before the display reads zero. One full discharge-charge cycle at standard current recalibrates the coulomb counter to the new curve and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB charging not detected after fitting the NBL-40A2950 replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Neffos C9 Max shows no charging indicator after a battery swap, the BMS on the new cell may be in a locked state from storage at low voltage. Connect the phone to a 5V\/1A charger — not a fast charger — and leave it for 15–20 minutes without pressing the power button. The charge IC sends a trickle current that nudges the cell voltage above the BMS unlock threshold, typically around 2.8–3.0V per cell, after which normal charging resumes. If the screen stays dark throughout, check that the battery connector is fully seated and the locking tab is clicked down flat.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391921750106,"sku":"BWCS-TPC910SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391921782874,"sku":"BWCS-TPC910SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391921815642,"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\/tp-link-neffos-c9-max-replacement-battery-385v-2850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}