My washer came with a free spare battery during a promotion and it's awesome. I probably use the spare as much as the original. Can't imagine not having it now.
I debated if I really needed a spare when I first bought the washer. After my first big weekend of spring cleaning, I ordered one immediately. Now I can do everything without watching the battery level. It completely changes how you use the washer. 💯
Washory pulls water from a bucket, and somehow still has better pressure than my old hose setup. Super easy and actually fun to use.