I have only used some of the older battery operated ones and keeping the batteries charged was much more aggravation than fooling with the line, and I have never used any with a blade that cut without getting all bound up with weeds and vines. To me the purpose of using a string trimmer is lost when you attach a blade.
My best solution was to buy a commercial string trimmer, that was powerful yet lightweight. I paid almost three hundred dollars maybe more for it, but it has been worth every penny. I have had it for years and had it rebuilt one time. I really had a need for a commercial line trimmer when I bought this, now I have very little trimming to do. I only have about a one acre suburban lot to maintain now.
I think if you only have a little trimming to do almost anything will suffice, if you have a separate edger. So maybe a battery operated one might be perfect for many people.
