{"product_id":"lg-vx9400-replacement-battery-37v-850mah-li-ion","title":"LG VX9400 LGLP-AGHM Replacement Battery 3.7V 850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG VX9400 — 3.7V Li-ion Replacement Battery (LGLP-AGHM)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 850mAh Li-ion battery for the LG VX9400 slider phone. It fits the VX9400, VX-9400, and LG9400 variants. Swap it in when the original cell no longer holds a usable charge through a normal day.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVX9400 platform fit:\u003c\/strong\u003e\n    The VX9400, VX-9400, and LG9400 all share the same battery bay dimensions, connector pinout, and BMS handshake. This cell matches those specs at 70.83 × 48.18 × 5.97mm, so it seats without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the VX9400 platform. The BMS accepted the cell without a protection trip, and the charge IC brought the cell to full capacity without thermal interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this replacement, run one complete discharge to roughly 10% and then charge to 100% without interruption. The VX9400'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 VX9400 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe VX9400's modem transmit bursts draw a short, sharp current spike. A new cell with a slightly different internal resistance curve can sag below the BMS cutoff threshold during that spike, even when the fuel gauge still shows charge remaining. This shows up as a hard power-off at 20–30% — not a gradual drain. One full discharge-charge cycle lets the fuel gauge IC map the actual voltage-capacity curve of the new cell, tightening the cutoff prediction. If shutdowns persist after two full cycles, check that the battery connector contacts are clean and fully seated.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVX9400 not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If this battery shipped or sat unused long enough to drop below approximately 2.5V, the BMS enters a lockout state and blocks normal charging to prevent damage to a deeply discharged cell. The VX9400 will show no boot, no charge indicator, and no response. Connect the phone to a low-current USB charger — ideally 500mA — and leave it for 20–30 minutes without pressing any buttons. This allows the charge IC to trickle current past the BMS lockout threshold; once the cell climbs above 2.9V, the BMS releases and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405257572442,"sku":"BWCS-VX9400SL-1","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405257605210,"sku":"BWCS-VX9400SL-2","price":29.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405257637978,"sku":"BWCS-VX9400SL-3","price":31.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VX9400SL-big.webp?v=1779370350","url":"https:\/\/batteryweb.com\/products\/lg-vx9400-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}