Actually, if you want to test this yourself you should do what @Paul_Mossip said – but do it in both directions. But I’ll stick with my answer – it’s “OK.” You may wish to check the following previous discussions vis-a-vis this topic:
https://forum.peplink.com/t/max-br1-mini-two-power-sources-barrel-and-poe-any-preference/6121e3a66b1bec0690001018/
https://forum.peplink.com/t/power-bank-and-ac-power-at-the-same-time/6121e3e06b1bec0690003545/
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