How to get the most out of your iPod battery

That is a tough one. Is your iPod fully seated -- will it play music in the im600? Have you tried a different iPod in the im600 to see if it charges? Does your iPod recharge normally in other players, in a wall charger and your computer? If not, your iPod could possibly need a new battery.
Also: since it was unplugged for 3 weeks, you may just need to run the im600 through a full cycle or two (let the FM radio play until the battery is dead, with no iPod in it), then recharge the im600 for 5 or 6 hours, and THEN mount your iPod into it and see if it charges it. Be sure to unplug/plug-in the adapter into the im600 to ensure it is getting full power from the wall outlet. One last thing: the im600 will only charge the iPod when it is plugged into AC power; it won't charge the iPod while it's running on its own battery power. Good luck!

Have your alternator tested.Your car will not stay running if the alternator is not producing enough power to keep the battery charged.Also have your battery tested and fully charged.Make sure your cables are in good shape.

This may not be the answer you are looking for but your I pod might not be fully charged, meaning that you are not plugging it in the computer/docking system long enough.( it takes much longer than 15 minutes to charge the battery. So you might want to plug it in/dock it over night) Or you may be playing a game that uses a lot of MB/GB so it kills the battery. And make sure that you press the play/pause button down for at least five seconds before switching the little switch at the top of your I pod. If you don't press the play/pause button for five seconds and just switch the switch at the top a little lock will appear on the left corner meaning you need to hold the play/pause button down for five seconds then the i pod screen goes black at that time flick the switch at the top off. -hope it helps owner of i pod nano and I pod touch.

You could try restoring the software back to factory defaults and see if something is missing. Make sure it is fully charged before doing it.

does it work on the charger? if not, then contact apple or your dealer for more assistance or repairs.

If it works on the charger, plays music and so on, your battery is probably dead and you need a new one.