{"product_id":"kaijin-kx-1203-replacement-battery-111v-1600mah-li-ion","title":"KAIJIN KX-1203 Replacement Battery 11.1V 1600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKAIJIN KX-1203 — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V 1600mAh (17.76Wh) lithium-ion battery for the KAIJIN KX-1203 portable medical device. It replaces the original cell when capacity has degraded or the pack no longer holds a usable charge. The KX-1203 is a clinical-use device, so the replacement cell must pass the onboard BMS verification cycle before the unit will operate normally.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKX-1203 fit:\u003c\/strong\u003e\n    This battery matches the KX-1203's 11.1V nominal rail and physical form factor at 101.50 × 54.20 × 11.20mm. The BMS handshake on this device expects a three-cell Li-ion pack — a mismatch in cell count or voltage trips a permanent battery fault in the device firmware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge-discharge cycle and monitored the BMS communication at each stage. The protection circuit responded correctly to charge termination and low-voltage cutoff without triggering false fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test:\u003c\/strong\u003e\n    After fitting this battery, let the KX-1203 complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power during this sequence stores a false battery fault that persists until the next clean reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the KX-1203 shows a battery fault immediately after a new cell is installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe KX-1203 firmware stores battery state data from the previous pack. When a new cell goes in, that stored data no longer matches what the BMS is reporting, and the device flags a fault. This is not a defective battery — it is the device comparing old calibration values against a new cell. One full charge-discharge cycle clears the mismatch and allows the BMS to write fresh state-of-charge data. Do not use the device in a clinical setting until that first cycle is complete.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stuck below 100% on the first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge, the KX-1203 charge IC applies a conservative current limit to an unfamiliar cell. This causes the charge cycle to terminate earlier than expected, leaving the indicator short of 100%. The cell is not faulty — the charge IC is being cautious with an uncalibrated pack. Run a full discharge followed by an uninterrupted charge; the indicator should reach 100% and the cell voltage should measure between 12.4V and 12.6V at termination.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381361836122,"sku":"BWCS-ZRQ120MD-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381361868890,"sku":"BWCS-ZRQ120MD-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381361901658,"sku":"BWCS-ZRQ120MD-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZRQ120MD-1.webp?v=1778900304","url":"https:\/\/batteryweb.com\/products\/kaijin-kx-1203-replacement-battery-111v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}