{"product_id":"apple-ipad-replacement-battery-37v-5400mah-li-polymer","title":"Apple iPad 3.7V Replacement Battery 616-0478 5400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple iPad A1219 \/ A1337 — 3.7V Li-Polymer Replacement Battery (616-0478)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5400mAh lithium-polymer battery replaces the original power cell in first-generation Apple iPad tablets. It fits iPad models A1219, A1315, and A1337 — the Wi-Fi and Wi-Fi + 3G variants of the original iPad. OEM part numbers 616-0478, 616-0448, and 969TA028H all cross-reference to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFirst-gen iPad compatibility:\u003c\/strong\u003e\n    The A1219 and A1337 share the same 3.7V battery bus and connector pinout. Both models use the same BMS handshake protocol, so this single cell covers the full first-generation lineup 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 an A1337 board. The BMS accepted the new cell on first connection, completed a full charge without thermal fault, and held stable voltage across screen-on and Wi-Fi active states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and corrects the inaccurate percentage readings that appear immediately after a battery swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eiPad shutting down at 15–25% remaining after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe original fuel gauge IC stores a learned capacity map from the old, degraded cell. When a new cell goes in, that map no longer matches actual cell chemistry. At around 3.6–3.7V, the iPad's power management chip sees a steep voltage drop under the combined load of the display and Wi-Fi radio. It reads this as imminent cutoff and shuts down — even though usable capacity remains. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% rewrites the fuel gauge baseline. After that cycle, shutdowns at 15–25% stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not resuming after battery swap on first-gen iPad\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe charge IC negotiates current acceptance with the battery's BMS on the first recognised charge cycle. Until that handshake completes, the iPad defaults to a lower input current as a precaution. This shows up as a slower-than-expected charge rate immediately after installation. Connect the iPad to its original 10W USB power adapter and let it complete one full charge from below 10% to 100% without interruption. After that cycle, normal charge rate resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426102313050,"sku":"BWCS-IPD100SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426102345818,"sku":"BWCS-IPD100SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426102378586,"sku":"BWCS-IPD100SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPD100SL-1.webp?v=1779930365","url":"https:\/\/batteryweb.com\/products\/apple-ipad-replacement-battery-37v-5400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}