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.
.svg){kind=icon}
