{"product_id":"pioneer-pap4322-duo-replacement-battery-37v-1650mah-li-ion","title":"Pioneer PAP4322 Duo Replacement Battery 3.7V 1650mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePioneer PAP4322 Duo \/ E60W — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1650mAh Li-ion cell for the Pioneer PAP4322 Duo and E60W smartphones. It replaces the original battery when capacity has dropped to the point where the phone can no longer hold a usable charge across a normal day. Physical dimensions are 51.36 × 50.89 × 5.03mm — verify these against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePAP4322 Duo and E60W fit:\u003c\/strong\u003e\n    Both phones share the same battery bay dimensions, voltage rail, and connector pinout, so a single cell covers both models. The BMS communicates over the same two-wire interface on each device.\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 bench and confirmed the BMS handshake completes correctly. Charge acceptance was normal from the first cycle, with no overcurrent trips or protection circuit lockouts observed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is introduced.\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 PAP4322 Duo after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. Under peak load — active modem, screen at full brightness, background sync — the new cell's internal resistance causes voltage to sag below the BMS cutoff threshold before the fuel gauge reads empty. The phone interprets this as a hard undervoltage event and shuts down even though the reported percentage still looks healthy. One full discharge-charge cycle at standard rate recalibrates the coulomb counter and the shutdowns typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows wrong battery percentage after fitting the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the PAP4322 Duo stores a discharge curve learned from the original cell. When a new cell goes in, the IC is still referencing the old curve, so percentage readings are inaccurate — often reading high early and then dropping sharply. The fix is one complete discharge to automatic power-off followed by a full uninterrupted charge to 100%. After that single cycle the coulomb counter resets its reference and percentage tracking stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404317360218,"sku":"BWCS-LVS760SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404317392986,"sku":"BWCS-LVS760SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404317425754,"sku":"BWCS-LVS760SL-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVS760SL-1.webp?v=1779369734","url":"https:\/\/batteryweb.com\/products\/pioneer-pap4322-duo-replacement-battery-37v-1650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}