{"product_id":"apple-ipod-1st-replacement-battery-37v-1600mah-li-polymer","title":"Apple iPOD 1st Generation Replacement Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple iPod 1st \u0026amp; 2nd Generation — 3.7V Li-Polymer Replacement Battery (P325385A4H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1600mAh lithium-polymer battery replaces the original cell in Apple iPod 1st and 2nd generation media players. It matches the OEM part number P325385A4H and fits the slim internal cavity at 84.90 × 54.69 × 4.00mm. If your iPod no longer holds a charge or won't power on, this cell is the direct hardware fix.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eiPod 1st and 2nd generation compatibility:\u003c\/strong\u003e\n    Both generations share the same 3.7V battery bay, connector pinout, and charge management circuit. One cell covers both without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a 1st gen iPod. The BMS accepted charge current normally, held cell voltage above 3.5V through the majority of the cycle, and triggered low-voltage cutoff cleanly without hanging the firmware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charge cycle on iPod hardware:\u003c\/strong\u003e\n    After fitting a new cell, connect the iPod to its original FireWire or USB charger and leave it for a full uninterrupted charge before first use. Swapping cells resets the charge controller's internal state — starting with a complete cycle lets the chip re-establish accurate voltage reference points for the battery indicator.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe iPod's fuel gauge reads battery state by tracking voltage thresholds — it does not count charge cycles the way modern smartphones do. When a new cell goes in, the controller still holds the old voltage map from the depleted original battery. This mismatch causes the percentage display to jump — often from 80% to 20% in seconds, or to report full when the cell is half charged. Running two or three complete charge and discharge cycles forces the controller to re-map its thresholds against the new cell's actual voltage curve. After that, the indicator stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePlayback cutting out before the battery indicator reads empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt the tail end of a lithium-polymer discharge, cell voltage drops steeply — from around 3.5V to the BMS cutoff at 3.0V within a short window. The iPod's audio amplifier draws a spike of current on every bass transient, and that spike can pull the voltage below the BMS trip threshold even when the display still shows a bar or two of battery remaining. The result is abrupt playback shutdown with charge still apparently left. If this happens consistently, the cell has likely aged past its usable capacity — a fresh 1600mAh cell restores the voltage buffer the amplifier needs. Confirm the new cell is fully charged to 4.2V before testing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381352792154,"sku":"BWCS-IPOD1SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381352824922,"sku":"BWCS-IPOD1SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381352857690,"sku":"BWCS-IPOD1SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPOD1SL_1.webp?v=1778900175","url":"https:\/\/batteryweb.com\/products\/apple-ipod-1st-replacement-battery-37v-1600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}