This came up 20 months ago on the topic of solar recharging, needing to know the barrel size then too, not in context of replacement AC charger but using solar instead of AC, that is the same need for knowledge of connector size.
See what I wrote then clicks through to Anker support statement
"_Per your question, the PowerHouse comes with an AC adapter to recharge itself. The connector of the AC adapter is a round cable with below tip size: 7.5mm*4.8mm*0.7mm. The input of the adapter is _
100V~240V and the output of the adapter is 16.8V/3A.
Hope this helps.
We look forwarding to hearing from you soon.