{"product_id":"amoi-mos-1-replacement-battery-37v-1000mah-li-ion","title":"AMOI MOS-1 Replacement Battery 3.7V 1000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAMOI MOS-1 — 3.7V Li-ion Replacement Battery (MOS-1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 1000mAh (3.7Wh), built to fit the AMOI MOS-1 smartphone. It replaces the original battery when the existing cell no longer holds a charge or causes unexpected shutdowns. Physical dimensions are 42.00 × 71.00 × 7.00mm — confirm these against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAMOI MOS-1 fitment:\u003c\/strong\u003e\n    The MOS-1 battery compartment uses a fixed connector and BMS handshake tied to this cell's voltage profile. A cell outside this voltage and form factor range will either fail to register or trigger a protection cutoff on first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles through this cell and monitored the BMS response at low state-of-charge. The protection circuit engages cleanly at the undervoltage threshold — no false cutoffs above 3.0V per cell were recorded.\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 its coulomb counter against the new cell's actual discharge curve before any high-current charging session pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MOS-1 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC still references that old curve — so displayed percentage drifts against actual voltage. The fix is one full uninterrupted discharge down to auto-shutdown, followed by a full charge with the screen off. After that single cycle, the coulomb counter re-anchors to the new cell's real capacity and percentage accuracy returns.\u003c\/p\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\"\u003eThis happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge anticipates — a voltage cliff the IC hasn't yet mapped. The phone reads 25% but the cell is already sagging below 3.4V under the combined draw of the radio and screen backlight. Run one full calibration cycle first: discharge to zero, charge uninterrupted to 100%. If shutdowns persist after that, check that resting cell voltage reads at least 3.6V with a multimeter before reinserting.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405097435226,"sku":"BWCS-AME002SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405097467994,"sku":"BWCS-AME002SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405097500762,"sku":"BWCS-AME002SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AME002SL_1.webp?v=1779369955","url":"https:\/\/batteryweb.com\/products\/amoi-mos-1-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}