{"product_id":"viewsonic-q3-replacement-battery-37v-1800mah-li-ion","title":"ViewSonic Q3 Li47180bk Replacement Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eViewSonic Q3 \/ Q5 \/ Q1 Series — 3.7V Li-ion Replacement Battery (Li47180bk)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1800mAh lithium-ion cell replacing the original Li47180bk battery in ViewSonic Q3, Q5, Q1, and Q3+ smartphones. It fits the same footprint at 63.80 × 39.20 × 6.90mm and connects to the same charge IC these phones use. Capacity is 6.66Wh, matching the stock spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQ-series model compatibility:\u003c\/strong\u003e\n    The Q1, Q3, Q3+, and Q5 share the same battery bay dimensions and connector pinout. ViewSonic used one battery platform across this range, so Li47180bk slots into any of them without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge-charge sequence and monitored the BMS for cutoff behaviour. Charge termination triggered correctly at 4.2V and low-voltage cutoff engaged before the cell reached unsafe depth.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to auto-shutoff, then charge to 100% on standard current. This gives the phone's fuel gauge IC one clean cycle to map the new cell's discharge curve before fast charge pushes higher current into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Q3 shuts down suddenly at 20–30% after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Q3's fuel gauge IC stores a discharge curve from the old cell. When a new cell with a slightly different internal resistance replaces it, the voltage-to-percentage mapping is wrong. Under load — screen on, mobile data active — voltage drops faster than the gauge predicts, and the phone hits the hardware undervoltage floor before the OS registers low battery. One full discharge-to-shutoff cycle followed by a full charge corrects the coulomb counter and eliminates false shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows incorrect battery percentage after installing a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on these ViewSonic phones uses a learned model of the cell's capacity, built up over many charge cycles on the original battery. A replacement cell resets that learned state, so percentage readings jump or stall — commonly showing 100% for long periods or dropping 10% in seconds. The fix is straightforward: let the phone discharge fully until it powers off, then charge uninterrupted to 100% without using the device. After that single calibration cycle, percentage tracking stabilises against the new cell's actual capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404310904922,"sku":"BWCS-VER300SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404310937690,"sku":"BWCS-VER300SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404310970458,"sku":"BWCS-VER300SL-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VER300SL-1.webp?v=1779369735","url":"https:\/\/batteryweb.com\/products\/viewsonic-q3-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}