I find these 2 items very useful with the Seastar S50.
Link to the Symik Ryobi battery power adapter:
SYMIK 100W Charger & 145W Power Source for Ryobi 18V Batteries, Advanced TwoWay Charger & Portable Power Source w/OLED Screen for Ryobi 18 Volt LithiumIon, 2 USBC & 1 USBA Port, LED Task Light https://a.co/d/bIpezMb