Battery stopped charging at 17 months

I've really liked this monitor for the last year and a half I've been using it. But the parent unit recently stopped charging. Now it no longer works unless it's plugged in. So now I have to lug the cord around and won't be able to use it outside this summer during naps. I was hoping it would last a little longer than this since my baby will continue to nap for another couple of years, I hope!

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