[Solved] Terrible stability with replacement batteries

[theseankelly]

Picked up a pack of these on amazon, because hey, 5 batteries for 16 bucks.
http://www.amazon.com/BTG-250mah-Batter ... ge_o03_s00

The crazyflie flies horrendously! The voltages look good and my inflight telemetry shows they stay above 3.5v during full flight, but the copter is all over the place. What did I do wrong, or what spec did I not look for? Discharge rate?

Thanks
Sean

[tobias]

Yes is sounds a lot like it is a problem with discharge rate. Try logging the battery voltage in the plotter tab when you are flying and check if it goes below 3.0V when pushing the throttle. Does hovering also give the same bad behavior?

[theseankelly]

Hahahahahahahahaha, well this is embarrassing.

Turns out, when testing out new batteries, it is important to ensure you're not using test firmware that has all stabilization disabled except for pitch

Was doing some PID tuning and forgot to put the normal firmware back on. Batteries work great.