Battery drains fast and neither joycon detected

Hi,

My nephew has given me his Nintendo switch to have a look at. The issue is that the bettery seems to drain pretty fast after a charge. But not only that, when sliding both joycon sticks to the side of the console there is no response. There’s no battery in neither to try to re-sync them either. The only way to use the console atm is by using the touch screen

I’ve ordered a battery and am going to replace this, and also give the console a good clean including both rails to ensure that there’s no dirt which might be affecting anything else.

But I was just wondering if anyone else has sad a similar issue for any kind of advice?

Thanks in advance.