For me the string trimmer is pretty much continuous use and significantly more work to do than today's batteries are up to.
Qualitatively, I have been generally satisfied with the battery performance of the Oregon chainsaw, pole saw, and string trimmer. Some of this depends on what you are cutting, or how long the grass is, having sharp chains, and having reasonable expectations. I always prefer the 4.0Ah battery over the 2.4Ah ones, as it lasts twice as long for the same weight.
The hedge trimmer surprising uses little battery life and runs on, and on, leaving multiple LED indicators lit. The leaf blower surprisingly uses a lot - it is very convenient, but drains the batteries quickly. I actually use it to 'finish off' batteries which are partially used (so that I can track the number of full charge cycles on each battery).
Have you seen the little push type lawn mower Stihl offers?
Seen photos of it only. Saw another brand in a big box store that used 2 batteries to drive 2 (independent?) motors and 2, small blades. Might be OK for light trimming tasks around a formal garden, where a full sized mower would not fit or maneuver well?
I looked at a 1/2 inch impact, a Milwaukee one at a Fastenall place, was like $450 for the kit. Not sure any company has all the possibilities and a chord isn't all that bad if you have been using them for years.
Some companies have the advantage or opportunity of sharing batteries with contractor type tools, as well as
Outdoor
Power
Equipment which is an advantage for some. DeWalt, B&D, Bosch, Ryobi, Makita, etc. It may require a compromise in the design of one or the other, but certainly convenient if you are already invested in a battery system for one use, and have occasional need for the other.
Until I got started with this Oregon system, I was all corded electric
Outdoor
Power
Equipment at home (except for the snow blower!). It is still the least expensive and lowest maintenance option. Battery is the most convenient, but lowest power and most expensive. Gas is highest power and highest maintenance.
Philbert