{"product_id":"metropcs-activa-4g-replacement-battery-37v-1400mah-li-ion","title":"MetroPCS Activa 4G M920 Compatible Battery 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMetroPCS Activa 4G \/ M920 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1400mAh Li-ion cell replaces the original battery in the MetroPCS Activa 4G and M920 smartphones. It fits the same footprint at 53.80 × 42.30 × 5.60mm and restores power to the display, processor, and cellular radio. Use the capacity figure from the product data — 1400mAh \/ 5.18Wh — as your reference, not the original packaging.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eActiva 4G and M920 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail, so a single cell covers both variants 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 full charge and discharge on the M920 platform and confirmed the BMS communicates state-of-charge data correctly to the OS throughout the curve — no false full readings at the top end.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge down to automatic shutoff, then charge uninterrupted to 100%. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before higher charge currents are applied.\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 Activa 4G after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Activa 4G's modem and display draw simultaneous current spikes during active calls or screen-on use. A fresh cell with an uncalibrated fuel gauge IC can report 25% remaining while the actual open-circuit voltage has already dropped toward 3.5V under load. The phone's protection circuit reads that voltage sag as a cutoff condition and shuts the device down — even though the percentage counter says charge remains. One full discharge-to-shutdown followed by a complete uninterrupted charge cycle recalibrates the coulomb counter and eliminates most of these premature cutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePercentage jumping erratically in the first two days after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the OS fuel gauge IC still holds the learned discharge curve of the old, degraded battery. It applies that curve to the new cell's voltage readings, producing jumps — commonly from 60% to 45% in minutes, or a sudden leap from 80% to 95%. This is a calibration gap, not a defective cell. Run the phone down to automatic shutoff, then charge to 100% without interruption. After that single cycle the gauge re-anchors its curve to the new cell's actual voltage profile and the percentage display stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405064306778,"sku":"BWCS-HU8860SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405064339546,"sku":"BWCS-HU8860SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405064372314,"sku":"BWCS-HU8860SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HU8860SL-1.webp?v=1779369883","url":"https:\/\/batteryweb.com\/products\/metropcs-activa-4g-replacement-battery-37v-1400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}