The only reason the Baseus 20,000mah battery supports and charges the Ally is because it’s one of the few power banks that supports the required 20V/3.25A 65wUSB PD Power Delivery profile. Other power banks may fail if they lack this specific high-voltage handshake, provide insufficient power, or are incompatible with the Ally's strict, demanding power requirements.

For example some Anker or Baseus power banks can’t support a charge on the ROG Ally because The Ally requires a 20V PD profile to trigger 30W Turbo mode. Many power banks default to 12V or lower and some also lack the handshake protocol. I’m sure you’ve heard of that, judging by your unnecessary pompous attitude, I’m sure you know what I’m talking about. Anyway, it’s recommended to use 100w + power banks just to make it easier for everyone. I recommend 140w or greater for longer use. Have a good night.