Not surprised the battery plunged that fast, I think constant live GPS and app pings eat it. Maybe lower the tracking frequency or turn off live mode on short walks if you want better battery life, not totally sure though. Charger felt flimsy to me too, and I wouldn’t trust it in proper rain.
Handy for quick rinses and fiddly spots when you don’t want to haul a hose. Don’t expect mains-level grunt though, the battery and flow just aren’t the same so crusty stuff often needs something stronger. If you want convenience more than raw power, it’s fine, otherwise stick with a proper washer.
Honestly, if you already have a cheap rotary tool like a Dremel, Qinux isn’t worth it. Dremel gives better control and cheaper bits, Qinux only makes sense if you specifically want something tiny and cordless.