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I have a 2ds I have recently turned on and worked perfectly I stopped using it for a few months and now it doesn’t turn on it it starts to charge but then stops and sometimes does charge but when it does charge I get no power when I try and turn it on

firstly, does the 2DS power on when plugged into power? If it is working on power but not when unpluged you likely have a bad battery. you can take this out and measure it with a multi meter to see how much charge it is holding, batteries in DS’s and other electronic devices can go “low” meaning they want charge properly and never store enough power without being charged by an external charging station. If its dead/dead, then refer to some of the troubleshooting guides on this website. Nintendo 2DS Repair