{"product_id":"tp-link-neffos-c9a-replacement-battery-385v-2850mah-li-polymer","title":"TP-Link Neffos C9A Compatible Battery 3.85V 2850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTP-Link Neffos C9A \/ TP706A — 3.85V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2850mAh Li-Polymer cell for the TP-Link Neffos C9A (TP706A) smartphone. It replaces a degraded or failed original battery and restores normal device operation. Dimensions are 76.00 × 59.10 × 4.15mm — confirm against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNeffos C9A and TP706A compatibility:\u003c\/strong\u003e\n    Both the Neffos C9A and TP706A share the same chassis, connector pinout, and charge IC. The voltage rail and BMS handshake are identical across both variants, so one cell covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the C9A platform. The BMS accepted the new cell without lockout, and the charge IC engaged correctly at full charge termination voltage.\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 full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging is applied to 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 C9A after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Neffos C9A's fuel gauge IC retains the discharge curve from the old, degraded cell. When the replacement cell hits a voltage point the IC maps as 20–30%, the modem or screen pulls a current spike the IC wasn't expecting — causing a hard undervoltage cutoff. The phone shuts off even though capacity remains. One full uninterrupted discharge-charge cycle forces the coulomb counter to rebuild its curve against the new cell, and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage. If the cell voltage drops below approximately 2.5V per cell, the BMS enters a protection lockout and the phone will not power on or show a charge indicator. Connect the phone to a wall adapter — not a PC USB port — and leave it untouched for 15 to 30 minutes. The charge IC trickle-charges the cell back above the BMS re-enable threshold, after which the phone will boot and charge normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391880134746,"sku":"BWCS-TPC920SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391880167514,"sku":"BWCS-TPC920SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391880200282,"sku":"BWCS-TPC920SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TPC920SL-1.webp?v=1779142499","url":"https:\/\/batteryweb.com\/products\/tp-link-neffos-c9a-replacement-battery-385v-2850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}