Checking the Battery Voltage

This section explains how to check the battery voltage with a battery tester.

The DeltaQuad Evo Battery has a nominal voltage of 22.2 V (3.7 V per cell). When fully charged, it reaches 25.2 V (4.2 V per cell). The battery and individual cell voltages can be measured with a battery checker, as explained below.

  • The DeltaQuad Evo Battery has a power lead with an XT90 connector. This cable and plug are used to power the DeltaQuad Evo.

The power lead is not used for checking the battery voltage.

  • The smaller cable, called the balance lead, is a multi-pin connector that allows the checker to measure the voltage of each cell.

  • Connect this multi-pin connector to the battery checker.

  • On the balance lead, the outer wires serve as the pack’s main negative (black wire) and positive (red wire) terminals.

  • Connect the balance lead as indicated on the battery checker. The checker will be powered by the battery through the balance lead.

  • To get an accurate battery percentage readout, set the battery checker to Li-ion type. Use the middle button to enter the menu, then the arrows to navigate to Battery Type and select LiIon.

Once set, the battery checker displays total voltage, cell voltage difference, battery type, remaining capacity (%), and the voltage of each cell.

Always fly with fully charged batteries (at least 95%).

Voltage Matching (Dual Battery Operation)

  • When operating the UAV with two batteries, verify that the voltage difference between the two batteries does not exceed 0.1 V.

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