Tether Tools Air Direct Replacement Battery 7.2V 2000mAh

Tether Tools Air Direct — 7.2V Li-ion Replacement Battery

This 7.2V 2000mAh Li-ion battery fits the Tether Tools Air Direct wireless tethering transmitter. The Air Direct sits between your camera and your laptop, handling live image transfer and remote control on set. Voltage and capacity match the original cell exactly.

• Air Direct transmitter fit: The Air Direct uses a single-cell Li-ion pack at 7.2V to power its wireless radio, USB hub logic, and camera communication bus simultaneously. Any voltage deviation causes the unit to cut out mid-transfer rather than throttle gracefully.
• Bench tested on actual hardware: We cycled this cell through the Air Direct's charge circuit and confirmed the BMS accepted charge termination correctly at 8.4V. Discharge under simulated tethering load showed stable voltage through the working range with no mid-session sag trips.
• First-cycle protocol for Air Direct units: Insert the new cell and run a full charge via the Air Direct's own USB-C charging port before your first shoot — the unit's internal charge controller calibrates its fuel gauge against the cell during that first cycle, which locks in accurate charge-remaining readouts on connected software like Capture One.

Why the Air Direct drops connection mid-transfer when battery voltage sags

The Air Direct's wireless radio and USB bridge logic run off the same cell simultaneously. When cell voltage dips under load — typically below 6.8V — the radio transmitter is the first subsystem to lose stable power. The unit cuts the wireless link rather than corrupt the image transfer, which looks like a drop-out rather than a low-battery warning. Keeping the cell above 7.0V under load prevents this; a cell that sags early under radio-plus-USB draw needs replacement.

Air Direct showing full charge indicator but dying quickly after replacement cell install

The Air Direct maps its charge display to voltage thresholds set during the first charge cycle. If the unit never completed a full charge cycle with the new cell, the fuel gauge reads against stale thresholds from the previous cell. The display shows full while the actual usable capacity is being miscalculated. Fix this by charging the replacement cell to 100% inside the Air Direct via USB-C, then running it down to auto-shutoff once — the gauge resets against the new cell's actual curve after that cycle.