I purchased an infinitive 3600 milliamp power bank from Walgreens for only $9.95. this power pack was Slim, cheap, and most importantly lightweight with a metal body to expel Heat. I purchased a roll of foam double sided sticky tabs from the Dollar Tree.. for a dollar
Update: played battle of kings for almost 1.5 hours... Yes I love this game... And my Oculus Go was still at 100%. The gap between the Go and the battery was perfect and kept the heat off the powerbank. Now my kids want me to upgrade there's.... Off to the store I go.