Is 24v or 60v better

What's the difference between a 40 volt and a 60 volt battery?

40 volt stuff that's beefier than most of what's available on 18/20/24V hand tool battery systems, while being cheaper and lighter than what you find in the 60V range. 60 volt stuff that seems to be their main product line advertising comparable to gas performance.

Should I buy a 40V or 80v Trimmer?

That's my only piece of advice but otherwise you should be fine with any choice it just depends on how much you want to spend. Op should note that there's an 80v trimmer that supports attachments and one that does not. The 40v line is funky. It always feels like there's uncertainty as to if Kobalt is going to maintain it.

Will a 20v battery work with a 40V mower?

To have a competitor at every price point vs the lower to high-end products in the market. Fundamentally,, they can just use common 20v batteries in parallel + serial and use 2+ 20v packs on higher power draw devices like mowers. Greenworks has 20, 40, 60 and 80 voltage systems. Meaning an 80v battery for your mower won't work with your 40v mower.

How many volts are in a 24v battery pack?

They run two 24V packs on larger stuff like mowers, although they're probably still a bit underpowered. 40 volt stuff that's beefier than most of what's available on 18/20/24V hand tool battery systems, while being cheaper and lighter than what you find in the 60V range.

Are 80v & 60V lines redundant?

There is always a risk that greenworks may decide that having an 80V and 60V line is redundant and discontinue one of them. Or they may invest into a 90V line if a competitor steps into that space.