Is it possible and safe to power on the DevTerm without batteries?

I’ve just built my DevTerm kit. However I will not receive the 18650 batteries until a few days and I’m a bit anxious. I wonder if it is possible and safe to power on the DevTerm using only the power adapter, without batteries installed.

Thank you!

No problem as long as your power source is powerful enough and cable is good.

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Exactly, having battery will prevent brownout if you power brick do not provide enough current during a spike, but other than that, a DevTerm can safely be run from a power supply only.