Some of the new EV3 rechargeable batteries have a circuit error and do not work properly. After you recharge one of these defective batteries, install it in the EV3, and turn on the EV3, you will see a brief red flash and then nothing. The problems is just with the battery, not the EV3 itself.
Below is the letter from LEGO Education explaining the problem and giving instructions for contacting them if you have a defective battery.
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