{"product_id":"uniscope-u73-replacement-battery-37v-1200mah-li-ion","title":"Uniscope U73 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUniscope U73 — 3.7V Li-ion Replacement Battery (U73)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion replacement battery for the Uniscope U73 smartphone. It fits the U73 directly and restores power to calls, messaging, and applications when the original cell has degraded. Dimensions are 53.00 × 33.90 × 5.70mm — confirm these against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU73 compatibility:\u003c\/strong\u003e\n    The U73 runs a single-cell 3.7V nominal Li-ion configuration. This replacement matches that voltage rail and connector orientation. No BMS adapter or wiring modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the bench and monitored BMS cutoff thresholds. The protection circuit tripped correctly at low-voltage and over-current limits, with no thermal anomalies during the charge phase.\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. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated reference.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\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\"\u003eThe U73's fuel gauge IC stores a discharge curve calibrated to the old, degraded cell. When you install a new cell, the stored curve no longer matches actual cell voltage behaviour. Under modem transmission or screen load, the new cell's voltage drops sharply at a point the gauge still reads as 20–30%. The phone interprets this as an under-voltage condition and shuts down. One full discharge-charge cycle recalibrates the coulomb counter against the new cell, and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If voltage drops below approximately 2.5V per cell, the BMS enters lockout to prevent damage and blocks normal power-on. Plugging in a charger may show no response at all. Apply a known-good USB charger for 15–20 minutes without pressing the power button — this allows the BMS to see trickle current, exit lockout, and resume normal charging. Once the LED or screen shows a charge indicator, the cell is above the recovery threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405032652890,"sku":"BWCS-NK5CHL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405032685658,"sku":"BWCS-NK5CHL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405032718426,"sku":"BWCS-NK5CHL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK5CHL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/uniscope-u73-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}