Cybernetik UHD 4K Compatible Battery 3.7V 900mAh Li-ion

Cybernetik UHD 4K — 3.7V Li-ion Replacement Battery

This 3.7V 900mAh (3.33Wh) Li-ion cell replaces the original battery in the Cybernetik UHD 4K and Ultra HD 4K cameras. It restores power to the imaging system, processor, and recording functions. Physical dimensions are 32.77 × 29.16 × 10.89mm — measure your original cell before fitting.

• UHD 4K and Ultra HD 4K fit: Both model names reference the same camera platform and share the same battery bay dimensions, connector pinout, and BMS communication protocol. One cell covers both.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a UHD 4K body. The BMS accepted the cell, reported battery status correctly, and held voltage above 3.5V through sustained 4K video recording draws.
• First-install charge cycle: Insert the cell and charge it fully inside the camera body before your first shoot. Some camera BMS systems only calibrate the battery-remaining indicator after completing one charge cycle from within the camera itself — skipping this step can cause erratic percentage readings from the start.

Flash recycling slowing down before the battery indicator hits low

The onboard flash draws a sharp burst of current to recharge its capacitor after each shot. As cell voltage sags under sustained use, that recharge current drops, and recycle time stretches noticeably — even when the indicator still shows 30–40% remaining. The BMS is protecting the cell from voltage collapse under high-current pulses, not misfiring. This is normal behaviour at lower state of charge, not a fault with the replacement cell. If recycle lag becomes disruptive, treat anything below 3.6V on the cell as effective end-of-shoot.

Battery percentage jumping or resetting erratically mid-shoot

Camera battery gauges map percentage to a voltage curve calibrated against the original factory cell. A new replacement cell can have a slightly different discharge curve, causing the indicator to jump — for example, dropping from 60% to 20% without warning. This usually corrects itself after one or two full charge-discharge cycles as the BMS learns the new cell's curve. If the gauge is still erratic after three cycles, perform a full drain to camera shutoff, then charge uninterrupted to 100% inside the camera body to force a recalibration at 4.2V full charge.