Ryobi 18V ONE+ 4Ah Lithium-ion Starter Kit with 4-1/2" Angle Grinder

Cordless tools have become indispensable for any DIY enthusiast or professional, and Ryobi's 18V ONE+ 4Ah Lithium-ion Starter Kit with 4-1/2" Angle Grinder is a promising addition to the lineup. Having tested this tool extensively, I can share my detailed insights and experiences with it.

The first thing that stands out about this angle grinder is its portability. Being cordless, it offers a level of convenience that's hard to beat, especially for those who often work in spaces where extension cords are impractical or a tripping hazard. The 18V battery system is a significant plus, as it integrates seamlessly with other Ryobi ONE+ tools, making it an excellent choice for anyone already invested in the ecosystem.

Upon unboxing, the setup was straightforward. The kit includes two 4Ah lithium-ion batteries and a charger, which is a generous addition. These batteries are essential because, as I quickly discovered, the grinder is quite power-hungry. The tool's powerful motor operates at 9,000 RPM, which is sufficient for most grinding and cutting tasks. However, this performance comes at the cost of battery life, and you'll find yourself swapping batteries more often than you'd like during extended use.

The grinder's ergonomics are commendable. It feels well-balanced in hand, and the auxiliary handle can be mounted in three different positions (left, right, and top), providing flexibility depending on the task. The handle also cleverly stores the spanner wrench used for changing discs, a small but thoughtful feature that prevents misplacing this crucial tool.

One aspect I particularly appreciated was the tool-free adjustable guard. It allows for quick adjustments without needing additional tools, which is a real time-saver. The spindle lock is another user-friendly feature, making accessory changes straightforward and efficient. These design choices reflect Ryobi's understanding of practical, on-the-job needs.

However, the tool isn't without its drawbacks. One significant issue is its compatibility with older Ryobi 18V batteries. If you have a collection of older batteries, you'll be disappointed to find that this grinder doesn't work well with them. It requires the newer 18V ONE+ batteries, which have extra connectors. This requirement isn't clearly communicated, leading to potential frustration and additional costs for those who need to upgrade their batteries.

Performance-wise, the grinder does an admirable job on various materials. I used it to cut through metal pipes, grind down concrete, and even sharpen mower blades. While it handled these tasks effectively, it became apparent that the grinder struggles with more demanding tasks. For instance, when cutting thicker metal or grinding for extended periods, the motor tends to slow down, and the battery drains rapidly. This limitation makes it less suitable for heavy-duty applications, where a corded model or a higher-end cordless grinder might be more appropriate.

The safety features on this grinder are adequate but not exceptional. The tool-free guard adjustment is convenient, but I found the lack of a lock-on switch somewhat annoying during prolonged use. You have to keep the trigger pressed continuously, which can become tiresome. Additionally, the tool heats up quickly under heavy loads, so it's essential to let it cool down between battery changes to avoid overheating and potential damage.

In terms of build quality, the grinder feels sturdy and well-made. The materials used are robust, and the overall construction gives confidence in its durability. However, the power switch design could be improved. During one of my sessions cutting stucco, the switch malfunctioned and wouldn't turn off without removing the battery. This issue appears to be related to overheating, causing the switch to melt and short-circuit internally. It's a rare occurrence but worth noting for those planning to use the tool intensively.

Noise levels are what you'd expect from an angle grinder—loud but manageable with proper ear protection. The vibrations are also within a tolerable range, thanks to the well-designed handle and overall balance of the tool.

One of the standout features of this grinder is its price point. It's an affordable option, especially when purchased during sales or promotions. For those who need a reliable grinder for occasional use or lighter tasks, this model offers excellent value. However, if you require a grinder for frequent, heavy-duty work, investing in a more robust, brushless model might be a better choice.

In conclusion, the Ryobi 18V ONE+ 4Ah Lithium-ion Starter Kit with 4-1/2" Angle Grinder is a solid tool with a few caveats. Its portability, ease of use, and integration with the Ryobi ONE+ system make it a convenient addition to any toolkit. However, its limited battery life, compatibility issues with older batteries, and occasional performance hiccups under heavy loads are factors to consider.

I would recommend this tool for DIY enthusiasts and professionals who need a reliable, cordless grinder for light to medium-duty tasks. It's a great value for the price, especially if you're already using other Ryobi ONE+ tools. For those with more demanding needs, exploring Ryobi's brushless models or other high-end options would be advisable. Overall, this grinder earns a respectable place in the Ryobi lineup, balancing affordability with practical functionality.