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It has a battery problem and it won’t turn on, the problem is that I don’t really have experience with fixing things. Should I get a new battery for it or what? Or should I get it taken in somewhere local and professional?

Hi! Replacing the battery on the Nintendo DS Lite is extremely easy: all you have to do is unscrewing that small philipshead on the bottom of the unit, to the right of the SLOT-2. It’s literally the only visible screw there. No need to send it anywhere. Getting a new battery shouldn’t be that complicated. You should find plenty of them on your local classifields site (such as Craigslist or eBay) , if not, try Aliexpress.