Went for this one, which can be recharged with a battery pack. Used it on the dogs at bath time and it’s pretty powerful. The hazelok ones look good but too bulky for me
Camping Shower Portable Dog Shower - Camping Accessories, Rechargeable Outdoor Travel Shower for Toilet Tent, Dog Washer Electric Shower for Home Emergency, Campervan Caravan Motorhome Essentials https://amzn.eu/d/4MtrUdO