However, after a short time the first candles have failed and the batteries change we noticed that these are leaked on the candle. On request at Amazon we received the feedback, we would have the candles probably turned too tight and therefore the battery has leaked. So we followed all the candles eased somewhat. Nevertheless, several candles have failed repeatedly. After Christmas, we had cleaned all the candles and vowed next year to buy high quality batteries, with whom I hope. No sooner said than done, I'm going on this year and I have 36 quality battery. But when I now wanted to equip with the batteries, the candles, I realized that really in ALLEN candles contacts were rusted. So it still work 2 of 30 candles. Complaints at Amazon revealed that my message to Jago was forwarded. Here you referred me to §476 BGB to the legal guarantee and that indeed after 6 months takes the burden of proof. I must now prove that the defect already existed at delivery.
You're using Christmas decoration usually not the whole year does not help me even further.
The upshot: All 30 have never worked at the same time, we are now sitting on 28 candles defective and get a replacement.