I feel your frustration. this is what I did for EC 5'............I drilled a hole big enough in a table board piece of junk and fitted the ec 5 ends so they wouldn't move kind of like a vise but just enough to get it in the hole to solder. I then tin the wire. 1 at a time .not both to avoid shorting it out. tin the end of the ec 5 . NOW its important to keep the soldering tip tined or heat wont transfer. after cleaning I tin the solder tip then touch the ec5 end to get it hot sticking the tip in the hole where the solder is about to liquify . when it does stick the wire in the hole. stick the tip to the wire and melt the wire tinning to the ec5 when it melts stop and let it cool for 20 seconds and then pull it out of the hole start it in the ec5 slot where it goes and tap it in with a small screwdriver. it will click in and now on to the next one. Ec 5's are for 4 and 6 cell BUG draw amps. good luck