{"product_id":"lively-5049sjbs2-replacement-battery-385v-3000mah-li-polymer","title":"Lively 5049SJBS2 Replacement Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLively 5049SJBS2 — 3.85V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 3000mAh (11.55Wh) lithium-polymer cell is a direct replacement for the Lively 5049SJBS2 smartphone. It fits the exact footprint at 76.90 × 62.26 × 3.40mm and matches the voltage rail the device's charge IC expects. If your original cell is swelling, dropping charge quickly, or failing to hold a reading, this replaces it.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e5049SJBS2 fit confirmation:\u003c\/strong\u003e\n    The Lively 5049SJBS2 uses a fixed connector and BMS handshake tied to cell voltage — this battery matches the 3.85V nominal required for the charge IC to accept the cell and begin the CC\/CV charge cycle without triggering a fault state.\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 under both standby and active screen loads. The BMS responded correctly at high-state-of-charge cutoff and did not trip on reconnection — a common failure point on fresh lithium-polymer cells with stiff internal impedance.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC is still calibrated to your old cell's discharge curve — running one slow cycle first lets it remap 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 5049SJBS2 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Lively 5049SJBS2 uses a coulomb-counter-based fuel gauge IC that builds its charge model against the cell it learned on. When you install a new cell, the IC still references the old discharge curve — so percentage readings drift or jump. This is not a fault with the new battery. One full discharge to auto-shutdown followed by a complete charge to 100% forces the IC to rewrite its learned curve against the new cell's actual capacity. After that single cycle, percentage accuracy normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the new cell's open-circuit voltage looks fine at rest, but under modem transmission or screen-backlight load, it sags below the BMS cutoff threshold — typically around 3.0V per cell — before the fuel gauge registers the drop. The OS reads 25% and the phone cuts out without warning. The fix is that first calibration cycle: discharge the phone fully under normal use until it shuts itself off, then charge uninterrupted to 100%. After calibration, the fuel gauge tracks the voltage sag pattern of the new cell and fires the low-battery warning before the BMS hard-cuts at 3.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392051806298,"sku":"BWCS-OTP504XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392051839066,"sku":"BWCS-OTP504XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392051871834,"sku":"BWCS-OTP504XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OTP504XL-1.webp?v=1779143526","url":"https:\/\/batteryweb.com\/products\/lively-5049sjbs2-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}