{"product_id":"vodafone-smart-prime-7-replacement-battery-385v-2500mah-li-polymer","title":"Vodafone Smart Prime 7 Replacement Battery 3.85V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVodafone Smart Prime 7 \/ VFD 600 — 3.85V Li-Polymer Replacement Battery (Li3925T44P8h786035)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2500mAh Li-Polymer battery for the Vodafone Smart Prime 7 and VFD 600 \/ VFD600 smartphones. It replaces OEM part Li3925T44P8h786035, which is the original cell fitted at the factory. Fit this when the existing battery no longer holds charge through a normal day of calls, messaging, and app use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSmart Prime 7 and VFD 600 compatibility:\u003c\/strong\u003e\n    Both model designations — Smart Prime 7 and VFD 600 — use the same battery bay dimensions (76.80 × 59.60 × 3.20mm), the same 3.85V nominal voltage rail, and the same OEM part number. One cell covers all three model variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle on a VFD 600 unit. The BMS accepted the charge handshake without error, the protection circuit tripped correctly at low-voltage cutoff, and the fuel gauge IC began tracking the new discharge curve after the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% without interruption. This gives the fuel gauge IC a clean discharge curve to calibrate against the new cell before high-current charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Smart Prime 7 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the VFD 600 board stores a learned discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads voltage and maps it to a percentage using the old data, so you get inaccurate numbers — often frozen at one value or jumping in large steps. One full uninterrupted discharge-to-charge cycle forces the coulomb counter to relearn the curve against the new cell's actual characteristics. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff issue, not a capacity fault. Under heavy load — mobile data, screen-on navigation, or a voice call — the cell voltage drops faster than the fuel gauge expects, hitting the BMS undervoltage cutoff while the OS still shows 20–30% remaining. It happens because the gauge IC is still calibrated to the old cell's internal resistance profile, which had a shallower voltage drop curve. Run two full discharge-charge cycles to let the coulomb counter recalibrate, then confirm the cell rests at approximately 3.85–3.87V at a reported 50% charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392087785562,"sku":"BWCS-ZTA910SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392087818330,"sku":"BWCS-ZTA910SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392087851098,"sku":"BWCS-ZTA910SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTA910SL-1.webp?v=1779143707","url":"https:\/\/batteryweb.com\/products\/vodafone-smart-prime-7-replacement-battery-385v-2500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}