{"product_id":"sunmi-l2ks-replacement-battery-387v-5000mah-li-polymer","title":"Sunmi L2KS POS Terminal Replacement Battery 3.87V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSunmi L2KS \/ T8A10 — 3.87V Li-Polymer Replacement Battery (JKRA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 5000mAh Li-Polymer battery for the Sunmi L2KS and T8A10 portable POS terminals. It replaces the OEM JKRA cell when the original degrades from daily charge cycles. The L2KS is an Android-based payment terminal used in retail and hospitality — keeping it powered through a full shift matters.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL2KS and T8A10 compatibility:\u003c\/strong\u003e\n    Both models share the same 3.87V cell format, connector pinout, and BMS handshake protocol — one battery covers both units without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through multiple boot cycles on the L2KS platform. The BMS handshake completed correctly, charge IC entered CC\/CV mode as expected, and cutoff voltages held within spec under combined display, wireless, and printer load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst deployment tip for payment terminals:\u003c\/strong\u003e\n    After installation, complete one full transaction cycle before deploying in a live environment. The terminal maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator correctly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the L2KS reboots mid-transaction after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe L2KS draws a short current spike when the thermal printer fires during receipt printing. On a new cell that hasn't completed an initial charge cycle, the BMS may read this spike as an overcurrent event and cut the output rail — causing an instant reboot. This isn't a faulty battery. Run the terminal through one full charge and at least one complete transaction before live deployment. The BMS learns the load profile and the trip threshold adjusts accordingly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTerminal stuck on boot screen and not completing PCI sequence after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe L2KS PCI boot sequence requires a stable voltage rail above 3.6V to complete the security chip initialisation. A new cell shipped at storage charge (~3.75V) can sit close to the minimum threshold, especially if the unit sat unused. If the terminal stalls on the boot screen, connect it to the charger and let it reach at least 4.0V before attempting to power on. One full charge cycle resolves this in almost every case.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415920345178,"sku":"BWCS-SML818BL-1","price":56.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415920377946,"sku":"BWCS-SML818BL-2","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415920410714,"sku":"BWCS-SML818BL-3","price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SML818BL-1.webp?v=1779757974","url":"https:\/\/batteryweb.com\/products\/sunmi-l2ks-replacement-battery-387v-5000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}