{"product_id":"bq-bqs-5050-replacement-battery-38v-2300mah-li-ion","title":"BQ BQS-5050 Replacement Battery 3.8V 2300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBQ BQS-5050 — 3.8V Li-ion Replacement Battery (BQS-5050)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2300mAh Li-ion replacement battery for the BQ BQS-5050 smartphone. It slots into the original battery bay and connects to the device's charge IC and fuel gauge circuit. Capacity matches the factory specification at 8.74Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBQS-5050 platform fit:\u003c\/strong\u003e\n    The BQS-5050 uses a single-cell 3.8V nominal rail with a proprietary connector keyed to the mainboard's PMIC. Voltage and connector geometry must match exactly — this cell does both.\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 BQS-5050 mainboard. The BMS accepted charge current without cutoff events, and the fuel gauge IC tracked state-of-charge across the full discharge curve without erratic jumps.\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 full discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging 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\"\u003eSudden shutdown at 20–30% on the BQS-5050 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity fault. When the modem transmits or the screen peaks, the draw spikes sharply. A new cell with an uncalibrated fuel gauge IC allows the reported percentage to sit at 20–30% while the actual open-circuit voltage has already dropped below the PMIC's cutoff threshold. The phone interprets this as a hard undervoltage event and shuts down to protect the board. One full discharge-charge cycle syncs the coulomb counter to the real cell curve and eliminates most of these events.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBQS-5050 not powering on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If the cell voltage drops below approximately 2.5V per cell, the BMS trips a deep-discharge lockout and the phone will not respond to a normal power-on press. Connect the phone to a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS re-enable threshold, typically around 2.9V, at which point the BMS releases and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392031260762,"sku":"BWCS-BQS505SL-1","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43392031293530,"sku":"BWCS-BQS505SL-2","price":28.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43392031326298,"sku":"BWCS-BQS505SL-3","price":31.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BQS505SL-1.webp?v=1779143030","url":"https:\/\/batteryweb.com\/products\/bq-bqs-5050-replacement-battery-38v-2300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}