{"product_id":"philips-xenium-x501-replacement-battery-37v-1650mah-li-ion","title":"Philips Xenium X501 Compatible Battery 3.7V 1650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips Xenium X501 \/ X333 Champion — 3.7V Li-ion Replacement Battery (A20ZDO\/3ZP)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1650mAh Li-ion cell built to fit the Philips Xenium X501 and a range of compatible Xenium handsets. It replaces the original battery when the phone no longer holds charge through a normal day of calls and messaging. Capacity is 1650mAh (6.11Wh) — matched to the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXenium X501, X333 Champion, X130, X513 and more:\u003c\/strong\u003e\n    These Philips Xenium handsets share the same battery bay dimensions (72 × 38 × 6.50mm), connector pinout, and BMS handshake protocol — one cell fits across the entire group 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 Xenium X501 and confirmed the BMS accepted the cell, reported state-of-charge correctly, and did not trigger a protection cutoff under normal screen-on and call load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use fuel gauge reset:\u003c\/strong\u003e\n    On first use after installing this cell, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC on the Xenium handsets calibrates its coulomb counter against the cell's actual discharge curve — skipping this step causes percentage readout errors for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Xenium X501 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Xenium X501 uses a fuel gauge IC that tracks charge by counting coulombs against a stored discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry — so the IC interpolates badly and shows inflated or deflated percentages. One complete discharge from 100% down to automatic shutdown, followed by a full uninterrupted charge to 100%, forces the IC to rewrite its reference curve. After that single cycle, percentage readout stabilises.\u003c\/p\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\"\u003eThis happens because the modem radio and display draw a surge of current that causes the cell voltage to sag sharply under load. If the cell's internal resistance is even slightly elevated — common in a new cell that hasn't completed its first calibration cycle — voltage can momentarily dip below the 3.0V protection threshold, and the BMS cuts power instantly. The phone interprets this as a dead battery even though the fuel gauge still showed charge. Run the first-use calibration cycle described above, and confirm the cell is sitting above 3.6V at rest before reassembly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405076136026,"sku":"BWCS-PAX501SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405076168794,"sku":"BWCS-PAX501SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405076201562,"sku":"BWCS-PAX501SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PAX501SL-1.webp?v=1779369919","url":"https:\/\/batteryweb.com\/products\/philips-xenium-x501-replacement-battery-37v-1650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}