Crazyflie reads voltage wrong

[alpylmz]

Hello, my crazyflie has a power problem. It reads the battery voltage normally in land, but when it takes off and moves, the voltage drops immediately. Most of the time I see that after 30 seconds the voltage comes to 2.5 or even below 2. Then I lose control of the crazyflie. However the voltage seems normal after I reopened Crazyflie, and it can takeoff and move for some time again. Do you have any ideas how this occurs or how can I fix this?

[tobias]

Might be a bad battery or oxide in the connector. You can read a bit about potential problems in this blog post.