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All tool batteries are powered by LiIon cells that range from an absolute 2.8V minimum to 4.2V maximum. That gives 3.6 volts "average". 5 cells make the most basic battery. 5 x 3.6 = 18V. That's how Ryobi choses to advertise their batteries. The average voltage between fully charged and fully discharged == Honest.
Other companies chose to use the maximum voltage only when almost right off the charger and not used which would be 4.0 to 4.2V. 5x4 = 20.
You get no additional voltage, no additional power (wattage) out of same AmpHour battery between one advertised at 18V vs 20V. 18V 4 AH battery from Ryobi is the exact same amount of power as a 20V 4AH from another company due to the stretching of nominal voltage rating.
A Ryobi battery fresh off the charger is usually at least 20.5V without load. That's going to be the same for any manufacturer.
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Our community has rated this post as helpful. If you agree, why not thank trza
I run a 2.5ah 40 volt battery with my pole saw all the time. The thing is, you're not really spending a lot of time making cuts. Usually it's one up to start and one down to finish. Maybe you do another to clean it up with no weight from the branch influencing things. Most of your time on the job is dragging branches and cutting them into more maneuverable and compact pieces. Once that limb is on the ground compound loppers are often the best tool for cutting. Maybe a chainsaw if it's rather large.
Chainsaw time is often similar. If you're doing limb work the chainsaw doesn't run much. If you're processing trunks run time goes way up.
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