Standard 18V cordless angle grinders are notoriously heavy power tools. Once you slide a large 4.0Ah or 5.0Ah lithium-ion battery onto the back of the machine, the total weight can easily skyrocket to nearly 3kg.
If you are working overhead, cutting metal in a tightly confined engine bay, or simply want to reduce arm fatigue during an afternoon of home DIY, finding a tool with a stripped-back, lightweight profile is essential.
When searching for the lightest 115mm cordless angle grinder in the UK, you have to look closely at the “bare tool” weight versus the “operational weight” (with the battery attached). Here is a breakdown of the lightest, most ergonomic options available on the UK market.
The Defending Champion: Bosch Professional GWS 18V-7
If your absolute priority is trimming down every possible gram without dropping to a tiny 76mm mini-cutter, the clear winner from the major trade brands is Bosch.
- Bare Tool Weight: 1.6 kg
- Operational Weight (with compact battery): ~2.2 kg
- Why it wins on weight: The Bosch GWS 18V-7 is intentionally engineered with a hyper-slim grip circumference and a lightweight brushless motor. It strips away all unnecessary bulk from the main housing, making it remarkably well-balanced and easy to guide with one hand if needed (though two hands are always recommended for safety!).
Check Amazon UK for Price of the Bosch GWS 18V-7 angle grinder.
3 More Top Lightweight Contenders Compared
To help you choose based on the battery platform you might already own, here is how the lightest 115mm cordless options stack up at UK retailers like Screwfix, B&Q, and Toolstation:
| Brand & Model | Bare Tool Weight | Estimated Weight With Battery | Key Benefit for Users |
| Bosch GWS 18V-7 (115mm) | 1.6 kg | 2.2 kg (using ProCORE18V 4.0Ah) | The slimmest handle design; lowest base weight. |
| Makita DGA463Z (115mm) | 2.0 kg | 2.6 kg (using LXT 4.0Ah) | Brushless motor with automatic speed control torque matching. |
| DeWalt DCG405N (115mm) | 1.75 kg | 2.4 kg (using XR 4.0Ah) | Includes electronic mesh covers to block internal dust ingestion. |
| Ryobi RAG18115-0 (115mm) | 2.1 kg | 2.8 kg (using ONE+ 4.0Ah) | Budget-friendly option, though noticeably heavier in the tail. |
The “Battery Paradox”: How to Keep a Cordless Grinder Light
The biggest mistake people make when buying a lightweight cordless grinder is pairing it with the wrong battery. Because angle grinders are high-drain tools, it is tempting to slide on a massive, heavy 5.0Ah or 6.0Ah battery pack. However, doing this instantly ruins the tool’s weight distribution.
To keep your setup as light as possible, follow this exact configuration:
1.Choose a Brushless Motor Model:
Always select a brushless grinder rather than a cheaper “brushed” model. Brushless motors are physically smaller and lighter while delivering higher mechanical efficiency.
2.Opt for Next-Gen Compact Cells:
Look for premium compact battery lines, such as the Bosch ProCORE18V (4.0Ah) or DeWalt POWERSTACK. These use stacked pouch cells rather than cylindrical blocks, providing high amp delivery at a fraction of the physical size and weight.
3.Utilise the Multi-Position Handle:
Keep the auxiliary side-handle attached. Even with a lightweight tool, changing the angle of the side handle alters your leverage, making the tool feel significantly lighter in hand.
Summary Buying Verdict
If you already own 18V batteries, stick within your ecosystem, but choose a brushless version to save your wrists. If you are starting completely from scratch and need the most agile, fatigue-free 115mm setup possible for long shifts or awkward spaces, buy the Bosch Professional GWS 18V-7 paired with a single-layer 4.0Ah ProCORE battery.