Angel Eye 550H Replacement Battery 3.7V 1100mAh Li-ion

Angel Eye 550H — 3.7V Li-ion Replacement Battery

This is a 3.7V 1100mAh Li-ion cell for the Angel Eye 550H compact digital camera. It replaces the original battery when capacity has degraded or the cell no longer holds a charge. Slide it into the same battery bay and the camera powers on as normal.

• 550H platform fit: The 550H uses a single Li-ion cell on a 3.7V rail. The battery bay dimensions — 53.10 x 38.40 x 8.00mm — match the OEM footprint exactly, so the contact plate seats flush and the door closes without force.
• Bench tested on actual hardware: We cycled this cell through the 550H's charge and discharge circuit. The BMS responded correctly to charge termination and did not trigger overcurrent cutoff during normal imaging loads including flash recharge draws.
• First-cycle charge protocol for the 550H: Run the first full charge from inside the camera body using the OEM USB or AC charger. Some compact camera BMS systems only update their battery-remaining map after completing a full charge cycle through the camera itself — skipping this step can cause the indicator to read full and then drop suddenly.

Dead battery indicator on the 550H with a partially charged replacement cell

The 550H maps its battery gauge against a voltage discharge curve calibrated for the original cell. A new third-party cell often has a slightly different resting voltage at partial states of charge. The camera reads that voltage as below its low-battery threshold and flags a dead cell warning even though usable charge remains. Completing one full charge cycle through the camera body re-anchors the BMS reference point and clears the false warning.

Flash not fully recycling between shots on a new cell

Flash recycling draws a short, sharp current spike to refill the capacitor between frames. As a Li-ion cell ages or if internal resistance is elevated on a replacement cell, that spike causes a brief voltage sag below the camera's operating threshold. The result is a longer-than-normal recycle delay or a partially charged flash on the next shot. Check resting cell voltage with a multimeter — a healthy cell should read between 3.7V and 4.2V at rest. If it reads below 3.6V after a full charge, the cell is not holding capacity correctly.