What does this symbol on the EV3 Brick mean?

Question

I can’t figure out how to get my R3PTAR to open and close it’s mouth to bite. I keep getting this symbol. What does it mean?

Answer 1

You either have to recharge your battery (if you're using a battery pack) or replace the batteries (if you're using normal batteries). If this symptom persists after charging the battery pack, try to do a master reset on the brick. Failing which, you might have to replace the battery pack.

Answer 2

It's a symbol for low battery power. You have to recharge the brick.

How long? Check out Mr. Hino's YouTube video on how long it took to juice his back up.

For a full recharge, we're waiting for the red brick light to turn off...