Oinom A1100 iPad Compatible Battery 3.7V 3200mAh

Oinom A1100 / A1100H — 3.7V Li-Polymer Replacement Battery

This is a 3.7V, 3200mAh (11.84Wh) lithium-polymer battery for devices using the A1100 and A1100H cell. It replaces a worn or failed original battery that no longer holds a charge across a full use cycle. The cell measures 63.30 × 56.00 × 7.00mm — confirm these dimensions match your device before ordering.

• A1100 and A1100H compatibility: Both model numbers share the same physical footprint, connector pinout, and voltage rail at 3.7V nominal. The BMS handshake uses the same single-wire data line, so either variant accepts this cell without modification.
• Bench tested on actual hardware: We cycled this cell through three full charge and discharge passes on the bench. The BMS held the upper cutoff at 4.20V and triggered low-voltage protection at 3.0V without dropping into lockout prematurely.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on a replacement cell

A new cell has a slightly different discharge curve than the original. The fuel gauge IC is still calibrated to the old cell, so its voltage-to-percentage map is off. When screen brightness or a background sync task pulls a brief current spike, the cell voltage dips below the OS shutdown threshold before the reported percentage reaches zero. Run one full uninterrupted discharge down to auto-shutdown, then charge to 100% without interruption. After that cycle, the coulomb counter recalibrates and the reported percentage tracks real voltage accurately.

Device not powering on after the battery sat in storage

Lithium-polymer cells self-discharge in storage. If the cell drops below roughly 2.5V per cell, the BMS trips into deep-discharge lockout and blocks all current flow to protect the cell from damage. The device will show no charge indicator and will not respond to a short charge attempt. Connect to a wall charger — not a PC USB port — and leave it for 30–45 minutes before attempting to power on. Most BMS circuits require a trickle current above the lockout threshold before they re-enable the main discharge path.