Ace hardware stock and have the 1” gate valves. But only thing need to do is change the metal screw on top of the gate knob to stainless steel one so doesn't rust.
Its fairly easy to swap out battery. There are videos on how to do. Battery can be bought on Amazon. Just one battery to replace. Only way to tell if battery is bad is to see if can hold a charge with battery tester.
Stock varies among vendirs you got high and some have bread and butter pieces. at near end of event some vendors will have deals. do dint have transport home.