You can find both in corded and battery-powered form, and they're available from most major power tool brands. Angle grinders and cut-off tools might seem like the same tool, but there are some ...
Unless you have an additional battery charged and ready, you'll be off the ... some tools like hedge trimmers or lawn mowers, it's super easy to accidentally cut through the power cord.
Viable cordless alternatives were demonstrated for handling rebar, concrete and everything in between from Bosch, DeWalt, ...