{"product_id":"lg-gd900-replacement-battery-37v-1000mah-li-ion","title":"LG GD900 LGIP-520N Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG GD900 Crystal \/ BL40 Chocolate — 3.7V Li-ion Replacement Battery (LGIP-520N)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell built to the LGIP-520N spec. It fits the LG GD900, GD900 Crystal, and BL40 Chocolate. Voltage, connector pitch, and BMS handshake all match the original LG specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGD900, GD900 Crystal, BL40 Chocolate compatibility:\u003c\/strong\u003e\n    All three models share the same 3.7V single-cell architecture, connector footprint, and charge IC protocol. One cell revision covers the full range 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 charge and discharge on the GD900 platform. The BMS accepted charge at the correct 4.2V termination voltage and the protection circuit tripped cleanly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge to automatic shutdown, then charge uninterrupted to 100% before normal use. The GD900's fuel gauge IC was calibrated to the original cell's discharge curve — one full cycle resets that reference against the new cell so percentage readings stay accurate.\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 GD900 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe GD900's processor and modem pull current spikes that a degraded or uncalibrated cell cannot sustain. When cell voltage drops below roughly 3.5V under that load, the BMS cuts output to protect the cell — even if the fuel gauge still shows 20–30% remaining. This is a voltage sag issue, not a capacity issue. A new cell with low internal resistance handles the spike without the voltage cliff that triggers the cutoff.\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 during storage. If this cell drops below approximately 2.5V per cell, the BMS enters lockout mode and refuses to supply current — the phone appears completely dead. Connect the phone to a wall charger rather than a USB port, since wall chargers supply enough seed current to wake the BMS from lockout. Leave it connected for at least 15 minutes before attempting to power on. Once the cell recovers above 3.0V, the BMS releases and the phone boots normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405137346650,"sku":"BWCS-LGD900SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405137379418,"sku":"BWCS-LGD900SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405137412186,"sku":"BWCS-LGD900SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LGD900SL-1.webp?v=1779370263","url":"https:\/\/batteryweb.com\/products\/lg-gd900-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}