That 9 litre water extinguisher has the same entinguishing capability as many 2 kg powder extinguishers (13A) today. Even the newer 9l water extinguishers are rated as 21A. Might want to look into upgrading the water solution inside or replacing that altogether.
EU doesn't get products with imperial units anyways as no one knows what it means. Sometimes you get both units if it's an extremely cheap Chinese item, but that's about it.
these GPS units are still quite good, as constant tracking on a smartphone consumes quite a bit of power, while these devices can run on few AA batteries for 15-30 hours.
Get it to boot, go into settings and change USB or "interface" mode to Garmin spanner, it won't autoboot into USB mode but will ask you if you want USB mode when you turn it on.
On some garmins those batteries are rechargable, though I don't know when they recharge. Either in USB mode or when you use external power though USB (if it supports it, either by using a garmin car GPS cable or clicking no at the USB screen when you change mode to garmin spanner). The battery is used for clock, perhaps the GPS almanac too but I'm not so sure about the latter.
Also, you should test your USB port, it's probably dirty or broken and that's why GPS thinks something is plugged in. Try measuring resistance between USB data pins.
That 9 litre water extinguisher has the same entinguishing capability as many 2 kg powder extinguishers (13A) today. Even the newer 9l water extinguishers are rated as 21A. Might want to look into upgrading the water solution inside or replacing that altogether.