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@Gordon
Hi - sorry to hear this. When you say the battery doesn't last, does the watch actually turn off, or is it just that the battery meter reads zero? If it's the reading, the calibration @Ganblejs mentioned may help.
But as you mention the battery meter dropping down substantially with the backlight on, that does sound like a battery issue - however it's quite surprising. It's not like I've had a great deal of issues with the battery failing in people's watches, and they shouldn't - recharging once a week the battery should last for years before there's any hugely noticeable drop in life.
As mentioned, you can get inside (see that video) and replace the battery but it's hard work, requires soldering, and will probably mess with the water resistance unless you're very careful glueing the screen back on.
All I can say really is what I've said to others who've had the watch fail after over a year - I can't replace on warranty but I'm happy to give you a 50% discount on a new one.
... but even if you're replacing it or trying to get inside it'd be worth doing a backup via the app loader, and if you're doing that you might as well completely erase it, ensure firmware is up to date, and see if that increases the battery life