USPS has disallowed them going to APOs. You can send them to the states with some restrictions, and I believe it will be allowed again (in January?), but for now, you might have to order to your German address, or if you can hold off that long, wait until the ban is lifted. You can see your local APO for more info on the ban (ours had it posted at the counter).
Anything without a battery is not a problem...