ipod shuffle 1st gen not working properly

I have had my ipod shuffle 1st gen for alot of years now and have never had a problem recently my hasnt detected it while plugged in whether direct or through a dock it, i have an accessory that came with it

that takes batteries to extend the battery life so longer music to listen too that works fine with it, it has power and im able to use it but it wont charge or be detected by my pc or laptop, im not sure what the issue is anyone can help me out?