Apple iPad 3.7V Replacement Battery 616-0478 5400mAh

Apple iPad A1219 / A1337 — 3.7V Li-Polymer Replacement Battery (616-0478)

This 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.

• First-gen iPad compatibility: 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.
• Bench tested on actual hardware: 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.
• Fuel gauge recalibration after swap: 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.

iPad shutting down at 15–25% remaining after battery replacement

The 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.

Fast charging not resuming after battery swap on first-gen iPad

The 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.