i just recieved 2 tp8000. i charged them and everything was fine. flew for about 5 minutes let rest and flew again. no problems charged again they both charged to 20.92 volts. flew for about 2 minutes and lost power. checked voltage. 1 has 20.15 other has 15.65. this mean battery is no good? i am flying an ion.

thanks

Hi, How you measure the packs voltage?
What charger and power source you use?
Shouldt get below 19 V.
see you.

Hacker setup?

Ion-X Baby !!!

Bad news...

Assuming you have checked the voltage with a volt meter and not just the charger display you have a damaged pack.

Inspect them before you do anything else. Also make sure they are stored in a fire safe area in case a cell goes ballistic.

The voltage should be around 18.5-19v for sure with a discharged pack that is not over discharged.
15v suggests to me that you lost a cell.

Jason Stiffey
Fly Fast....Live Slow...