It might still be the Battery, you need to buy a new one.

You need a new Battery.

Besides cleaning it a good tip to do is to make sure the console is warm. Game Gear's act up if they are exposed to extreme cold.

If you are trying to play SNES Pal games that look like this https://goo.gl/images/ofPNhg on a regular SNES it will not work, because Pal is mostly famicom, a version that looks like the European version of the console. To play them on a regular american snes you need to modify your console. Otherwise get games that look like this https://goo.gl/images/yKmhnP.

It could probably be the video cord for the SNES. It's the yellow one, I have an SNES and I have to make sure it's positioned correctly or there's no video. Try making sure the yellow cord is plugged up to your tv and if it still doesn't show anything, wiggle it around while still connected to the tv. If worse comes to worse, you can buy more video/audio cords.

It could be that the device just cannnot detect any battery that is it is given. I'd suggest checking the connection when you connect any battery.

There could be three problems. The first could be that you have some outdated apps on your iPhone. Outdated apps slow down your phone in general if they are not compatible with IOS 11. Another possibility is that you have a lot of memory on your phone. I'd suggest clearing some up. The third I can say is that it might be the processor. Some devices take longer to load information or data.

The touch screen sensor is most likely off, the only way to fix it is to take apart the DS lite and straight out the sensors. There are guides on this site to help out with that. If you don't prefer to do it yourself I'd suggest finding a shop that can fix them.