{"product_id":"lg-nexus-5-16gb-replacement-battery-38v-2300mah-li-polymer","title":"BL-T9 LG Nexus 5 Replacement Battery 3.8V 2300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG Nexus 5 D820 \/ D821 — 3.8V Li-Polymer Replacement Battery (BL-T9)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2300mAh lithium-polymer cell built to replace the original BL-T9 battery in the LG Nexus 5. It fits the D820 and D821 variants, both the 16GB and standard models. Voltage and capacity match OEM spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eD820 and D821 compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The D820 is the North American band variant; the D821 covers global bands. Same cell, same fit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell in a D821 unit under mixed load — screen-on, LTE active, GPS polling. The BMS held charge termination correctly at 4.35V and cut off cleanly at the low-voltage threshold without triggering a hard shutdown loop.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use, disable fast charging and run one complete discharge-to-charge cycle from 100% down to auto-shutdown, then charge uninterrupted to full. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated state-of-charge register.\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 Nexus 5 fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that curve no longer matches the actual voltage-versus-capacity relationship. Under modem or display load, the cell voltage dips faster than the IC expects, triggering a low-voltage cutoff even though the reported percentage reads mid-range. Run one full discharge cycle without interruption — the coulomb counter resets and the shutdowns stop. Target a resting voltage of 3.85V at the 50% mark to confirm the recalibration is tracking correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after sitting in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-polymer cells self-discharge in storage. If the cell drops below approximately 2.5V per cell, the BMS enters a protection lockout and blocks normal charging to prevent damage to an over-discharged cell. The phone shows nothing — no charging indicator, no boot screen. Connect to a wall adapter rated at 5V\/1A or higher and leave it for 20–30 minutes without pressing the power button. The BMS recovery circuit trickle-charges the cell back above the lockout threshold, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404296683610,"sku":"BWCS-LKD821SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404296716378,"sku":"BWCS-LKD821SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404296749146,"sku":"BWCS-LKD821SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKD821SL-1.webp?v=1779369643","url":"https:\/\/batteryweb.com\/products\/lg-nexus-5-16gb-replacement-battery-38v-2300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}