Wii-U REMOTE won't power up when turned on. But, Wii-U console works fine.?

Wii-U REMOTE won't power up when turned on. But, Wii-U console works fine. We've had this console for about 3 years. We just used it a few days before, and it stopped working 2 days ago. We use an extension cord and ac adapter, and it worked fine before. Please help!
Update: Update: We tried turning it on and off, and unplugging and replugging it back in. Sometimes, it turn on for a second, and then turns back off.
Update 2: We keep the Wii-U plugged into the charger all the time. I don't think it's the batteries.
Update 3: Problem solved! Needed to just fix the charging cord!
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