{"product_id":"lenovo-a6-note-replacement-battery-385v-3900mah-li-polymer","title":"Lenovo A6 Note BL303 Replacement Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo A6 Note — 3.85V Li-Polymer Replacement Battery (BL303)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3900mAh Li-Polymer cell at 3.85V, replacing part number BL303 in the Lenovo A6 Note. It fits models PAGK0027IN, PAGK0027, and L19041. Swap it when the original cell no longer holds a charge through a standard day of calls and screen use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA6 Note \/ PAGK0027 platform fit:\u003c\/strong\u003e\n    These model numbers share the same physical footprint, connector pinout, and BMS handshake protocol. The BL303 part number covers all variants — PAGK0027IN, PAGK0027, and L19041 — because Lenovo used a single battery specification across regional hardware revisions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the A6 Note platform. The BMS accepted the new cell without fault flags, and the charge IC ramped normally through CC\/CV phases with no thermal cutoff events.\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 coulomb counter — which otherwise causes erratic percentage readings early on.\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 A6 Note after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running the old cell's voltage-to-capacity curve. A new Li-Polymer cell holds a different internal resistance profile, so the reported percentage and the actual deliverable voltage diverge under load. When the modem fires a high-current burst — during a call or data transfer — the cell voltage drops below the BMS cutoff threshold even though the gauge still reads 25%. One full discharge-charge cycle without fast charging forces the coulomb counter to reset against the real cell curve and eliminates premature shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not engaging on the first cycle after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSome A6 Note units fail to negotiate fast charge on the first session with a new BL303 cell. The charge IC performs a handshake with the BMS at the start of each session — a new BMS may not respond within the expected window on cycle one, so the charger falls back to standard 5V input. This is not a fault with the cell or the charger. Complete one full standard-rate charge, then reconnect — the BMS handshake completes correctly on subsequent cycles and fast charge resumes at the expected rate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391911788634,"sku":"BWCS-LVA610SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391911821402,"sku":"BWCS-LVA610SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391911854170,"sku":"BWCS-LVA610SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVA610SL-1.webp?v=1779142596","url":"https:\/\/batteryweb.com\/products\/lenovo-a6-note-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}