Cordless angle grinder

The **cordless angle grinder** is a portable angle grinder designed to perform straight, cross and angle cuts, or roughing and polishing tasks on various materials such as metal, stone, ceramics and concrete. Unlike corded grinders, this type of angle grinder operates using rechargeable batteries, providing greater freedom of movement and versatility, making it ideal for construction work, light carpentry and DIY . 

Their ergonomic design makes them easy to operate with one hand. Cordless angle grinders have gained popularity due to their portability and ease of use. They are characterized by their mobility, lightness, and versatility, especially in places without access to the electrical grid. They use lithium-ion batteries, usually 12 V, 18 V, or 20 V. 

## History 
The angle grinder was invented in 1954 by the German company *Ackermann + Schmitt* ( *FLEX-Elektrowerkzeuge GmbH* ) in Steinheim an der Murr 

## Characteristics 
* It uses a circular abrasive disc that rotates at high speed, with different diameters (usually 115 mm, 125 mm or 150 mm).

* It works with lithium-ion batteries, usually 18 V, 20 V or 36 V.

* Includes auxiliary handle, disc guard and shaft locking system.

* Some models incorporate a *brushless* motor for greater efficiency.
* Power: between 1200 and 2000 W.
* Disc diameter: 115–150 mm.
* Cutting depth: up to 65 mm at 90°.

## Advantages and disadvantages 
### Advantages 
* Greater freedom of movement than cable ones
* Less weight and size.
* Ideal for quick cuts on site or outdoors.

### Limitations 
* Lower autonomy and power than wired models.
* They require recharging or additional batteries for extended work.

## Battery types 
Cordless angle grinders are rated by battery voltage, which determines their power and runtime.

### 10–12 V 
Compact and lightweight models, suitable for precision work or light cutting.

* **Bosch GWS 12V-76**
* **Makita CP100DZ**

### 14.4 V 
Less common today, but still present in mid-ranges.

* **Makita DGA452Z** (compatible with 14.4V and 18V batteries)

### 18–21 V 
Professional range. High power for demanding jobs.

* **Bosch GWS 18V-10**
* **Makita DGA513Z**
* **DeWalt DCG405N**
* **Einhell TE-AG 18 Li**
* **Worx WX800**

### 28–36 V 
Industrial models for intensive tasks and larger diameter discs.

* **Milwaukee M28 CAG125X**
* **Makita DGA900Z**

## Comparison between market models  
They started with small, low-power radials, but today they cover a very wide range. 

### Technical notes 
* Max RPM : No-load speed. The higher the speed, the more efficient it is at fine cutting.
* Electronic brake : Stops the disc when the trigger is released, improving safety.
* Kickback control : Detects blockages and shuts off the tool to prevent kickback.
* BITURBO / FLEXVOLT / XGT : Technologies that increase performance in high-end models.

## Disc table for cordless grinders (76–125 mm) 
## Battery pack technology 
Battery packs require battery balancing, which is a technique that maximizes a battery's ability to have all of its energy available for use and increases battery longevity.  Typically, a battery regulator is a device built into the battery pack that performs battery balancing.  Most modern cordless drills use lithium-ion batteries which offer: 

* Higher energy density.
* Less weight.
* Absence of memory effect.
* Fast charging and long life.

## Internal architecture of battery packs 
The nominal voltage of a battery pack is determined by the number of 3.7 V cell subgroups connected in series. Each subgroup can be made up of one or more cells in parallel, which increases the capacity (Ah) of the pack. 

The presence of intermediate taps in the pack's wiring allows the BMS (internal or located in the charger) to monitor and balance the state of charge of each group of cells. This balancing is essential in series configurations, since the cells do not balance themselves automatically as they do in parallel. Some low-cost designs use diodes to limit cell imbalance, although this technique offers limited protection and may reduce the battery's lifespan. 

== Power packs => % Charge vs. Volt ==

## Applications 
* Cutting of wooden boards, MDF, plywood.
* Cutting metal profiles with suitable discs.
* Cutting of plastics and synthetic materials.
* Installation, assembly and renovation work.

## Security 
Hand-held radial saws include protection systems such as:

* Adjustable disc guard.
* Safety switch.
* Non-slip grip.
* Cutting guides and cutting line blowers.

## Related pages 
* Angle grinder

## References 
## Literature 
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* 

## Other websites 
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