I was very satisfied with my nexto extreme nd2700. Now, after several years of use, I need a new battery (and also a battery charger because it is not working anymore? I tried to contact NextoDi. No reply after three weeks of waiting! I try to contact the german distributors Istego and 21byte, no reply. Great that I can find a tutorial which describes how I can change the battery. But what I do to become an answer where I can buy this battery??? I'm disappointed, sorry.