I have posted a bit on battery powered chainsaws, but I have also used other battery OPE. Lots of this stuff now in the Home Depots, Lowes, etc., and they tell me that it is very popular in Europe.
For years I used corded electric OPE: lawn mower, string trimmer, hedge trimmer, leaf blower, etc. Very economical to buy, compared to gas OPE, and incredibly easy to use and maintain. No spark plugs, no air filters, no carbs to adjust, no fuel filters, no ethanol issues, no flooding, etc. Lighter, less noise, super easy to start. Everything but the snowthrower! Of course, I live on a 50' X 150' city lot and am never more than 100 feet from an outlet.
The new battery stuff is really impressive too: I have used lawn mowers, string trimmers, leaf blowers, hedge trimmers, pole saws, a rototiller, etc.: Oregon 40v and Redback 120V brands
I always suggest that folks who have a lot of battery powered contractor type tools (Makita, DeWalt, Milwaukee, Bosch, etc.) start with their offerings, since they are already invested in that battery platform (typically about half the cost of each tool). If starting from scratch, or choosing a separate platform for O*P*E, take a look at the entire line offered by the brand: you may think that you only want one tool, but pretty soon . . . So that can include: Oregon Redback, STIHL, Husqvarna, EGO, Toro, GreenWorks, . . .
Many lines offer a range of battery 'sizes' / capacity: sometimes higher capacity batteries are physically larger and heavier, sometimes they are the same size and weight (due to higher capacity cells).
Amp Hours X Volts = Watt Hours
E.g.: my Oregon 6Ah X 40V = 240Wh battery has the same 'capacity' as my Redback 2Ah X 120V = 240Wh battery.
I can string trim and mow my front and back lawn on one battery, unless things are really out of control. Really feel like 'full sized' mowers. The Oregon hedge trimmer just 'sips' battery life: I can do a 50' hedge and still have 3 out of 4 LEDs (remaining life) left. Leaf blowers are another story: they blow leaves and suck juice out of the battery. Any brand. Just be aware.
I encourage anybody to get models with external, swappable batteries, and have at least one extra battery so that you can keep working while the other(s) recharge. Otherwise, look for a place / brand that you think will support their products a few years down the line.
Philbert