My Rating 8.5/10
The metabo 18v cordless grinder is a good powerful little grinder that can also use hitachi slide batteries (as it should since they’re the same company). This will eat through everything as quickly as an electric angle grinder. Its worth getting a 6 AH battery to stay working for longer between recharges. Even though this grinder is fairly energy efficient and you should usually get most jobs completed without changing batteries. Its a good quality tool and should last for many years
My Rating 7/10
This ryobi 18v battery grinder is another good budget tool and is probably the best value out there. It may not be the best overall but almost everything else at their price range is junk. Ryobi have been making quality tools for a good few years now so if your looking for a cheap grinder for light jobs then this is certainly worth considering. Its compatible with various batteries including: P100, P101, P102, P103, P104, 105, P107 and P108
My Rating 9/10
This porter cable 20v grinder has to be the top budget grinder on the market If you have similar batteries on other tools such as black and decker and don,t want to spend much its a no brainer . Power and light weight are probably the most salient features in this line of 20-volt tools. Porter-Cable is to be commended on their design. Now that the 4 amp-hour batteries are available, they are even more attractive. It has impressive power and run time for its price.
My Rating 8/10
For a battery operated tool this Dewalt 20v grinder has plenty of power comparable to a corded model. I like the two safety features, the anti-kickback and the brakes but I wish they kick in faster instead of taking 1.5 seconds to full stop. This one needs a stronger battery a 5 or 6 AH battery will give you all the power you need. If you use a 2 AH battery it wont last long might feel under powered.
Overall Solid built, Quick stop, Cuts and Grinds as it’s built for. Just get some high amp batteries for longer use.
If you have invested in the Bosch 18V platform this bosch 18v cordless grinder would be a great addition to your toolbox. It will run a long time with the 6.3 amp hour batteries as you will have to buy a battery and charger anyway . I have seen a few complaints about fitting the protection guard or that it only fits in one position. Overall its a powerful grinder and the bosch blue line of tools already have their reputation for quality products.
My Rating 9/10
The milwaukee m18 cordless grinder is a very well built product, threaded arbor makes it easy to connect threaded disks. Swapping of disks requires no tools, the tightening nut has a flip up handle that can be loosened and tightened by hand. Comes with a cutting guard, grinding guard, and two dust shields for intake vents. If you’re doing a lot of work make sure you have extra batteries or one on the charger. The braking function works great, stops the disk significantly faster than a non braking. So you can place it down sooner and not worry about it taking off or damaging your work surface. Very nimble and not too heavy with no cord makes this grinder tough to beat. Overall, a tool I would recommend to anybody looking for a small, medium- powered angle grinder.
My Rating 10/10
In the makita cordless angle grinder review it comes out as one of the best in its class. This is an excellent grinder , it has almost as much power in the way it runs as a corded grinder. It is fast to charge and its not much heavier than corded models.
Has great power to do most grinding jobs around the house and in a small shop or garage even with its portable size. The battery life is better than what you would expect for a cordless tool, even on a 3.0 Ah battery. Feels quite solid in the hand when in use and its easy to maneuver. All in all this is a good dependable tool as you would expect from Makita.