{"product_id":"lenovo-s5-replacement-battery-38v-2800mah-li-polymer","title":"Lenovo S5 Replacement Battery LB002 3.8V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo S5 \/ K520 Series — 3.8V Li-Polymer Replacement Battery (LB002)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2800mAh Li-Polymer replacement battery for the Lenovo S5 (K520, K520T Pro, PABX0000CN) smartphone. It replaces the original LB002 cell when capacity has degraded past usable thresholds. Dimensions are 85.90 × 62.80 × 3.68mm — verify your existing cell matches before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS5 \/ K520 platform fit:\u003c\/strong\u003e\n    These models share the same battery bay geometry, connector pinout, and BMS handshake protocol. One LB002 cell covers the full K520 lineup without 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 S5 platform. The BMS accepted charge from both standard 5V and the device's fast-charge controller. Coulomb counter initialised correctly after one full cycle.\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 for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into 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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a steeper voltage drop curve than the worn cell the fuel gauge IC was calibrated against. When the phone pulls high current — active LTE, screen at full brightness, GPS — the cell voltage briefly collapses below the BMS cutoff threshold even though the reported state of charge reads 25%. The phone sees an undervoltage condition and shuts down to protect the cell. One full discharge-to-shutdown followed by a complete charge resets the coulomb counter and aligns the fuel gauge IC to the new cell curve. After that cycle, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not working on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLenovo's proprietary fast-charge handshake between the charge IC and BMS requires the battery to present within an expected voltage window before high-current delivery is authorised. A new cell shipped in storage state often sits at 3.6–3.7V, which can fall outside the fast-charge entry window on some S5 firmware revisions. Connect the phone to a standard 5V charger and allow it to reach at least 3.85V before reconnecting a fast-charge adapter. The charge IC will then re-negotiate the fast-charge protocol and resume high-current delivery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391895404634,"sku":"BWCS-LVK521SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391895437402,"sku":"BWCS-LVK521SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391895470170,"sku":"BWCS-LVK521SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVK521SL-1.webp?v=1779142596","url":"https:\/\/batteryweb.com\/products\/lenovo-s5-replacement-battery-38v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}