Macca371

When I dug out my old laptop yesterday it was fine when it operated connected to the mains, but when I took the power socket out, the laptop switched off. I thought that maybe it wasn't charged enough, so I left it on charge for about 8 hours and tried to turn it on without power, but it didn't work. I thought that perhaps there was a problem with the actual laptop not the battery and maybe it wasn't detecting it, but it wasn't, because whenever the laptop was off and I had the battery and mains connected to it, the 'battery charging' light was on, and whenever I removed the battery this light went out.
When I start the laptop and go on Windows and go on power options, it detects the battery whenever I insert it, and it says power level at 3% and charging, but it never changes, even after a few hours.

By the way I haven't used the laptop and battery for about 12 months.
Has the battery gone?