CyberPower CPUAC1U1300 - Universal Power Adapter, 1300mA, USB & Round-Pin Connectors, 7 Tips, Folding Plug

If the ac input is just a small, round connector, try one of these adapters. https://www.walmart.com/ip/30253322?sid=07570a93-d4ad-4981-8e27-be242c9e521d