The ptFlex board requires a DC power source in the range of 7.0 to 12.0V. For High Altitude Ballooning, a 2-cell 7.4V lithium-polymer battery pack is optimal, and a 1300mAh pack will generally supply power to track the system for more than 5 hours. If external sensors or actuators are being included, or if additional recovery time is desired, higher-capacity packs can be used. Note than higher voltage packs will NOT extend run time, and will only serve to increase the ambient heat produced by the primary voltage regulator.
Current consumption is generally under 50mA, but may exceed 150mA on transmit with the built-in DRA818V transmitter (ptFlex DRA).
| Battery | Capacity | Runtime* |
| 7.4V Lipo | 1800mAh | 24 hours |
| 7.4V Lipo | 500mAh | 7 hours |
* Approximate runtimes are based on an ptFlex with the onboard DRA818V transmitter module, transmitting packets twice per minute. Many factors can affect your overall battery life including how often the packets are transmitted, battery condition, temperature, and any other sensors or circuitry that might be attached.