Airis PhotoStar 5633 Compatible Battery 3.7V 1050mAh

Airis PhotoStar 5633 / N633 Series — 3.7V Li-ion Replacement Battery

This is a 3.7V 1050mAh (3.89Wh) lithium-ion battery for Airis PhotoStar digital cameras. It fits the PhotoStar 5633, 6820, N633, and N635 among others. Same voltage, same form factor — drop it in and the camera body closes cleanly.

• PhotoStar 5633 / N633 platform compatibility: These models share a common battery bay geometry and 3.7V single-cell input rail. The connector orientation and cell dimensions (53.20 × 35.30 × 7.10mm) match across the series, so the same cell services multiple bodies without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS communicates correctly with the camera body. Charge acceptance was clean and the protection circuit tripped at the expected low-voltage cutoff — no runaway, no false-full readings.
• First-cycle BMS initialisation: Run the first full charge inside the camera body or OEM charger before shooting. Some Airis camera BMS systems won't map battery-remaining percentages accurately until the body completes one charge cycle with the new cell seated.

Flash output dropping mid-shoot on a new camera battery

The flash capacitor draws a sharp burst of current each time it recharges between shots. Toward the end of a cell's charge, internal resistance rises and the capacitor can't pull enough current to fully charge in the time between frames. The result is softer flash output — not a faulty flash unit. If this happens early in a session with a new cell, the cell wasn't fully charged before use. Charge to 4.2V (full) before the next shoot and the recycle time returns to normal.

Battery percentage jumping erratically on the display

Camera battery gauges map voltage thresholds to percentage steps — the OEM cell's discharge curve is what the firmware expects. A new replacement cell may have a slightly different discharge curve, so the voltage-to-percentage mapping drifts and the indicator skips or jumps between readings. This is a display calibration issue, not a fault with the cell. Run two or three full charge-discharge cycles and the firmware recalibrates its tracking to the new cell's actual curve.