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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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2. Two-pack is regular. Three-pack is HP.
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20v BRANDED tools (Dewalt) are 18v when measured WITH LOAD.
The BATTERIES are THE SAME (voltage wise) only the BRANDING is different (some manufacturers might also use different cells [Sanyo vs Samsung] which will only affect things only battery gurus measure, unless you buy knockoffs on Ebay, then those batteries often don't have the mah they claim to).
However, there may be some slight differences in the TOOLS, because some manufacturers have 18v BRANDING in North America and 20v BRANDING in SA/Af/Europe/Asia...tools are still basically the same, with very minor variations, often found even with tools of the same branding (like 6800 rpm vs 7000 rpm, etc).
Running concurrently? No/Idk...
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Edit: Reviews say the wall mount is terrible and it doesn't charge through the wall mount. That would make it not worth $200 for tool only for me.
Look at direct tools outlet for ryobi refurbished from the factory.
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