Did the green light go out on the balance charger after charging? Have you measured the voltage with a multimeter on the power connection? Have you measured the voltage with a multimeter on the balance plug?

If so, can you let us know the voltages. If not, could you test the voltage and let us know? This will help determine if it's a warranty issue or if it's a user problem etc.

The developer kit doesn't have a rechargeable battery included. It used 6 aa batteries. There are instructions in the Learn section on connecting your battery. Did you find the instructions?

I am sure that the voltage is stable 220 v . I am sure that the plug is ok. I was waiting until the battery which in the body of ez robot is charged and the green light is off but when I connect the battery ( the body) no response. No power. No any thing. thank u

What EZ Robot is your battery inside of ? Do you have Voltmeter - (Multimeter)?

What battery are your charging ?

The battery is inside the body . Idon't know what its kind is. But it should be charged and I did but no power

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From your video, it looks like you may have been charging the battery with the power switch on. Please very carfully review the Learn Section for Battery Care and Charging I do believe your issues will be resolved if you follow that lesson.

Also, you stated you have the developer kit, but it does appear that you do have the JD robot kit. Please makes sure you also review all of the JD Lessons in the Learn Section.

Have you measured the voltage with a multimeter on the power connection (the red plug which is accessible when you remove the EZ-B) or across Vcc and Ground of any digital port when switched on? Have you measured the voltage with a multimeter on the balance plug?

By checking the above we can find out where the problem lies, or at least we can get a little closer.