Ipod will play on tunebase fm but it won't charge it

There are issues with newer ipods not being 100%compatible with all devices. It is done intentionally by Apple to maximize their profits. For example, an FM transmitter charges and plays on one Ipod, but then a newer ipod will play with the FM transmitter, but the ipod display shows that it is incompatible and will not charge. Same issues with a docking station and a radio. All worked with three other ipods, but the newer ones either won't work or charge depending on the device. Even though ipods play with certain devices they may not charge them and vice versa. Thank Apple for that. I hope this helps and good luck!