What are current European rules regarding carry-on lithium batteries?  I read somewhere that Germany would confiscate batteries, but Lufhansa's Web site says that batteries up to 100 W-hours are OK.  I am interested in flying to Amsterdam or Frankfurt from the US this summer.     

We have had no problems carrying up to 4 batteries the size we use within Europe. Last time on a flight with a connection in Frankfurt. They have to be carried in hand luggage, protected and with the terminals isolated. It's better to take them out of the bag at security checkpoints.