Just boought new MacBook- Flickers when on battery power.... take it back?

Just boought new MacBook- Flickers (brightness) when running on battery power, is this normal or should I take it back to the Apple store?

If you talking about your screen getting little dimmer on battery than with power cord plugged in, that's normal. But if your screen flickers all the time, no that's not normal. I would say take it to an Apple store, and have them look at it.
My mac started to flicker after 6 months or so, I too thought it may be normal, but when I took it in for something else, they noticed it and got it fixed.

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