I saw your follow up to this post. This message taken at face value as it was written is bad and dangerous advice that I do not want anyone to follow. I mean no offense to you and I thank you for clarifying that you do not speak English and are using a translator. We have people from all over the world here and all are welcome. Some things do not translate well. Short circuits in lithium cells are always to be avoided as the results can be very bad. This fact is the very reason that Simon clearly said that he only recommends high quality protected cells for use in the L6. Experienced people can do what they wish and many here do so and quite safely but this takes research and knowledge of the battery chemistry and much more. There is a very good thread covering all the basics of lithium ion safety here.