iPod Classic won't turn on

iPod Classic won't turn on
I use my ipod in my car to listed to music. I’ve left it in there all the time plugged in. A month or so ago, when I turned on the radio and selected media device, ipod, I would get the message, “device unavailable.” After about 10 minutes of driving the device would wake up. I believe the battery was dying and not charged when I started the car.

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