{"product_id":"samsung-galaxy-jean-replacement-battery-385v-3400mah-li-polymer","title":"Samsung Galaxy Jean EB-BJ805ABE Compatible Battery 3.85V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy Jean \/ A6+ 2018 — 3.85V Li-Polymer Replacement Battery (EB-BJ805ABE)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3400mAh Li-Polymer cell that replaces OEM part EB-BJ805ABE in the Samsung Galaxy Jean, Galaxy A6+ 2018 Duos, Galaxy A6 Plus 2018 Duos, and Galaxy A9 Star Lite, among others. It matches the original cell footprint at 91.10 × 45.50 × 4.90mm and uses the same flex connector the motherboard expects. Capacity is rated at 3400mAh (13.09Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalaxy A6+ and Jean platform compatibility:\u003c\/strong\u003e\n    These models share the same 3.85V power rail, identical flex connector pinout, and the same BMS handshake protocol — which is why one cell covers the full variant range including Duos SKUs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Galaxy A6+ 2018 board. The BMS accepted the cell without error flags, charge IC stepped through trickle, CC, and CV phases normally, and the fuel gauge IC logged a full cycle without dropping to safe mode.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This gives the fuel gauge IC a clean discharge curve from the new cell before high-current charging pushes against an uncalibrated state-of-charge estimate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Galaxy Jean reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSamsung's fuel gauge IC builds a discharge curve from historical cycle data stored against the old cell. When you swap the physical cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The OS reads voltage from the IC and maps it to a percentage using the stale curve — so 40% displayed might be 25% actual. One full discharge down to automatic shutdown, followed by a full charge to 100%, forces the coulomb counter to reset and write a new baseline curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Galaxy A6+ after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge IC predicted — a voltage cliff. Under peak draw from LTE transmission or screen-on brightness, the cell briefly sags below 3.4V and the BMS trips a protective cutoff before the displayed percentage reaches zero. It is not a fault with the cell itself. Run the first full recalibration cycle, then check that the shutdown stops occurring above 15% — if it persists, confirm the flex connector is fully seated and re-check contact resistance at the board-side pads.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391987122266,"sku":"BWCS-SMA605SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391987155034,"sku":"BWCS-SMA605SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391987187802,"sku":"BWCS-SMA605SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMA605SL-1.webp?v=1779142786","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-jean-replacement-battery-385v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}