{"product_id":"motorola-droid-bionic-replacement-battery-37v-1700mah-li-ion","title":"Motorola HW4X Droid Bionic Replacement Battery 3.7V 1700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola Droid Bionic \/ Atrix 2 — 3.7V Li-ion Replacement Battery (HW4X \/ SNN5892A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1700mAh Li-ion cell that replaces the HW4X battery in the Motorola Droid Bionic, Atrix 2, Edison, and MB865. It fits the same physical bay and connector as the factory cell. Capacity is rated at 6.29Wh under controlled discharge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDroid Bionic and Atrix 2 compatibility:\u003c\/strong\u003e\n    Both devices share the same 3.7V battery bay, connector pinout, and BMS handshake protocol — the HW4X form factor covers the full platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Droid Bionic under screen-on and modem-active load. The BMS held voltage above 3.5V through the mid-range discharge band and triggered cutoff cleanly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on the Droid Bionic calibrates its coulomb counter against the cell's actual discharge curve — skipping this step causes the OS to read the old cell's curve and report inaccurate percentages.\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 Droid Bionic after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Droid Bionic's processor and LTE modem pull current spikes that the fuel gauge IC cannot always predict on a new cell. When the cell voltage drops faster than the calibrated curve expects, the IC sees a voltage cliff and triggers an emergency shutdown before the displayed percentage reaches zero. This is not a defective cell — it is a calibration mismatch between the new cell's impedance profile and the stored fuel gauge model. Run one full discharge cycle from 100% to automatic shutdown, then charge uninterrupted to 100% to reset the model. After that cycle, shutdowns in the 20–30% range stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage, and if this battery dropped below 2.5V per cell before installation, the BMS will have locked out to prevent damage. The Droid Bionic will show no response — no boot, no charge indicator — when the BMS is in lockout. Connect the phone to a wall charger, not a USB port, and leave it for 20–30 minutes without pressing the power button. The charge IC needs time to trickle current into the cell and bring it above the BMS recovery threshold of approximately 2.8V before normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405066043482,"sku":"BWCS-MXT875SL-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405066076250,"sku":"BWCS-MXT875SL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405066109018,"sku":"BWCS-MXT875SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MXT875SL-1.webp?v=1779369883","url":"https:\/\/batteryweb.com\/products\/motorola-droid-bionic-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}