I found the Ryobi ONE+ONE cordless 10″ miter saw to be pretty unusable out of the box, but with a some calibration it might be a good choice in some situations.
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ONE+ HP Technology delivers corded cutting performance. Fast and accurate cuts. Makes up to 550 cuts per charge when paired with a 4.0 Ah HIGH PERFORMANCE Battery (not included) Sliding design provides maximum capacity for up to 12 in. cross cuts. Up to 4,100 RPM for fast and accurate cuts.
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18V ONE+™ 216mm Cordless Sliding Mitre Saw [R18MS216-0]