SOLVED!
I have solved this problem!
I had a problem with my lamp not charging when I plugged it in. The red indicator lamp would light up red (like it should while charging) but then it started blinking. It blinked for about 20 sekonds and then lit up again for a few seconds before starting to blink again. Eventually it did charge but it could take anything from one hour to many hours before it started to charge without blinking. I got new led lenser batteries from the dealer but this did not help. The problem is the cheapo charger that led lenser sends with this lamp. It has a really low quality interchangeable universal plug. They probably made it this way to save money by not having to manufacture dedicated chargers for each different system - UK, US, EUR and so on.
The charger has two small pins that should contact the universal wall plug when you slide it on. In my case I could see (and even hear) blue sparks where the smal pins connect to the wall plug. It was only visible when the room was dark and I only noticed this by chanse while I wa son my computer and the lamp was charging beside me. This is a serious problem which I am amazed that Led Lenser has not called back these chargers. It could start a fire and burn down your whole house. With you in it!
I took of the universal plug and bend the small pins on the charger forward a little bit, just with the tip of my finger so that they would contact the plug better. The lamp now charges without any problems.
Try this, it might work. If not then demand a complete new lamp from your dealer. You have warranty, use it! If you don't have the original reciept then a bank statement or a simple screen dump from your internet bank account payment info is sufficient, by law! At least in the EU.
Another way is to just use a regular AA battery charger to charge up your batteries.
Good luck