{"product_id":"vodafone-smart-n9-replacement-battery-38v-2800mah-li-polymer","title":"Vodafone Smart N9 TLp029D1 Compatible Battery 3.8V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVodafone Smart N9 \/ VFD720 — 3.8V Li-Polymer Replacement Battery (TLp029D1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V 2800mAh Li-Polymer replacement battery for the Vodafone Smart N9 and VFD720 smartphone. It uses OEM part number TLp029D1 and fits the original battery bay without modification. Swap it in when the original cell no longer holds a usable charge across a full day.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSmart N9 and VFD720 compatibility:\u003c\/strong\u003e\n    Both the Smart N9 and VFD720 share the same 3.8V cell format, connector pinout, and BMS handshake protocol — one battery covers both variants without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the VFD720 platform. The BMS accepted the charge IC handshake on the first connection, and cell voltage held within spec across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins — skipping this step is the main cause of erratic percentage readings post-swap.\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 Smart N9 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Smart N9's fuel gauge IC stores the discharge curve of the original cell in non-volatile memory. When a new cell goes in, that stored curve no longer matches the actual voltage profile of the replacement. Under modem or screen load, the cell voltage drops faster than the gauge predicts, and the phone shuts down before the reported percentage reaches zero. One full discharge-charge cycle at standard current rewrites the coulomb counter baseline. After that cycle, shutdowns below 20% should stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone stays warm near the battery during the first few charges after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell arrives with higher internal impedance than a broken-in cell. The charge IC pushes current into that higher resistance, and the extra heat is normal for the first two to three charge cycles. Impedance drops as the cell conditions. If the phone still runs noticeably warm after five full cycles, check that no background processes are drawing continuous load during charging — on the VFD720, disable Wi-Fi sync during charge until the cell is fully conditioned.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391995281498,"sku":"BWCS-OTF508SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391995314266,"sku":"BWCS-OTF508SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391995347034,"sku":"BWCS-OTF508SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OTF508SL-1.webp?v=1779142856","url":"https:\/\/batteryweb.com\/products\/vodafone-smart-n9-replacement-battery-38v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}