Audun

Same thing happened to me two weeks ago. New Quik-lok grass trimmer and new 12 Ah battery. What I think is happening here is a combination of things: 1) This is one of very few tools you use continuously till the battery is drained, so there is a lot of time for heat to build up. 2) It is made for use with the big heavy batteries (5 Ah overheated for me) 3) The tool vibrates a bit 4) It is 18v The combination of all of these factors does not appear in many of Milwaukee tools. In short, you have a high continuos current through a heavy vibrating battery and tool. The spring loaded contacts are not heavy duty enough to not offer a bad connection under these circumstances and will overheat. The problem will be less prominent if you take breaks and or run the tool on low speed setting. Also this seems to only happen with the string trimmer, not the other attachments as they draw less current and are often not used continuosly for the duration of the battery. Maybe they should mark it with intermittence 50% or something, haven't seen anything about intermittence in the manual, so then one assumes it is 100%. I have started making breaks and running on low speed for now, but will contact supplier and or Milwaukee about this issue.