{"product_id":"lg-ax500-replacement-battery-37v-1700mah-li-ion","title":"LGIP-420A Replacement Battery for LG AX500 3.7V 1700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG AX500 \/ UX500 — 3.7V Li-ion Replacement Battery (LGIP-420A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1700mAh Li-ion cell replacement for the LG AX500 and UX500 smartphones. It slots into the same battery bay as the original LGIP-420A and restores power to a phone that no longer holds charge through a full day of use. Capacity figure is 1700mAh — sourced from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAX500 and UX500 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The LGIP-420A cell fits either device without modification. The BMS handshake is identical across the two variants, so the phone's charge IC accepts the new cell on first boot.\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 AX500 platform. The BMS reported correct voltage at each charge stage, and the protection circuit tripped as expected at the low-voltage cutoff threshold — no runaway, no false full-charge signal.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after cell swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging if available and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its internal table to the new cell's actual discharge curve before estimating state-of-charge under cellular modem load.\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 AX500 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AX500's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, the gauge's calibration no longer matches the actual voltage-to-capacity relationship of the replacement. At around 20–30% reported charge, the phone's modem or display draws a current spike that the new cell can sustain — but the gauge reads the resulting voltage dip as a crash below the shutdown threshold. One full discharge-charge cycle forces the coulomb counter to rebuild its internal table. After that cycle, the phone should stop cutting out early.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice 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. If the replacement battery dropped below approximately 2.5V per cell before installation, the BMS protection circuit will have triggered a lockout to prevent charging a deeply discharged cell. The phone will show no response — no boot, no charge indicator. Connect the phone to a wall charger and leave it undisturbed for 15–20 minutes; some chargers deliver a trickle recovery current that nudges the cell above the BMS re-enable threshold. Once the charge LED activates, normal charging can resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405122764890,"sku":"BWCS-LAX500XR-1","price":27.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405122797658,"sku":"BWCS-LAX500XR-2","price":30.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405122830426,"sku":"BWCS-LAX500XR-3","price":33.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LAX500XR-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/lg-ax500-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}