Review on Lithium-Ion Brushless 2-Position Adjustable Auxiliary Brush by Radney Taala

I took the risk when I bought this grinder because it came with a charger and a 4.0 Ah battery. The quality corresponds to the "how much". For $110-120 its performance is justified. I wouldn't call it a "beast" like others have as it all depends on how hard you use this grinder. Do you want to cut 1/4" (6.4mm) mild steel? Of course it will, but then it will quickly drain the battery. The same goes for any thick metal you want to cut. I use it to cut rebar 1" thick ...He did just fine.But then he ate 1/4 of the battery.Note that the thicker the material, the more battery power is wasted just trying to overcome the friction of the sides of the wheel contacting the part , when the wheel is fed. So not only are you using battery power to cut the edge of the circle. , but the extra battery power comes only from the cutting blade cutting deep into the material. With a fresh battery it's on par with the 6A-7A Cable Grinder One way to maximize battery life (aside from constantly cutting thick materials) is to use very rough/abrasive cut-off/grinding wheels and flap wheels.The coarser the grind fgrains are, the faster they cut and the faster they get in and out of the material. I only use 3M Cubitron II .045" cut-off wheels and 1/4" grinding wheels. They're so abrasive you can cut almost twice as fast with them as you would with regular black cut-off/grinding/flap discs. The same goes for 1/8" thick grinding wheels. Forget about using 120+ grit flap wheels if you have a lot of material to remove. You're wasting so much battery power just trying to overcome friction that you'll run dry in no time Time.. When you turn it on, it has a smooth start that slowly accelerates the grinding wheel in about 3 seconds, which is very good!It really saves battery power!seconds.That's because the energy it takes to generate angular acceleration is proportional to the acceleration²! When accelerating slowly, the energy loss is much less, even if it happens a little longer! The only downside is that one of the jam nuts (the one that is tightened with a wrench) was not drilled / cut properly, so it screws onto the shaft of the mandrel at an angle, which is why it was sharpened The cutting wheel wobbles a lot, I have K Emailed IMO and they sent me a new collet nut. The shank is NOT 5/8"-11 but metric thread M14x2.0mm. I don't really care because I only use abrasives with a 7/8" bore anyway. It would be great if a short conversion adapter was included threads up to 5/8"-11 for those who need it. Overall the unit is very balanced and the wheels/discs work fairly accurately so there isn't excessive vibration. Not anymore than a corded angle grinder for $40-50.The handle is pretty cheap,it's very short and hollow.But hey,you don't get everything for such a low price!Overall for the price it's not bad if you just making small projects. It's not DeWalt. You won't see any contractors using this in the field. It just won't have battery life. Of course you can get lots of extra batteries and then it's fine, but the choice is yours. So small projects at home where you don't have time to do things: absolutely Use it for heavy grinding/cutting/etc.: you'd better order lots of extra batteries if you really al les have to do wirelessly. What Kimo really needs is to offer a high-capacity 8.0Ah battery for less than $70, and then it would be worth using for some really heavy use.