Rating of the best battery grinders for 2020

A set of a modern master will be incomplete without a "grinder" - an angle grinder, which came to us in the early 70s. last century from Bulgaria and became popular due to its practicality and versatility.

Now there are many products on the market that do not differ much in their design, but have a different set of capabilities. The best manufacturers are constantly looking for innovative solutions to improve their products by introducing the latest battery power supplies. This review will present the best battery grinders, their characteristics and descriptions, advise on what to look for in order to avoid mistakes when choosing, and also clarify - how to choose and which one is better to buy.

Appointment

Cordless grinder (angle grinder, angle grinder) is an autonomous hand-held power tool equipped with a grinding or cutting disc and running on a rechargeable battery (AKB).

It was originally used for flat seams. However, with the development of building technologies, the scope of application has expanded significantly.

Where is used

An angle grinder with a battery will be needed in the field if it is not possible to connect to the electrical network to perform the following actions:

• grinding, polishing or cutting metal products - fittings, beams, corners, pipes, channels;

• cleaning old paint or corrosion;

• cutting bricks or ceramic tiles, as well as cutting grooves in walls;

• brushing wood to give an aged look;

• manufacture of cutting machines, chain sharpening machines.

Each type of material requires its own special disc:

• grinding for metal up to six millimeters;

• grinding flap;

• detachable for metal up to two millimeters;

• cut-off for ceramics or concrete with a diamond edge;

It is not recommended to use angle grinders for cutting wood or glass; there are tools for these purposes!

Advantages

The popularity of the models is due to a number of advantages:

• Mobility - Autonomous use of the tool without being connected to the mains.
• Small weight and size values ​​with a mass of products no more than four to five kilograms.
• Reduced noise compared to networked products.
• Ease of use without power cord limiting maneuverability.
• Low power with comfortable grip and tough cuts.
• Ease of use.

disadvantages

• High cost due to the equipment of the battery. The larger the battery capacity, the longer the unit will function, but at a more expensive price.
• Low power depending on battery capacity.
• Short battery life without recharging.
• Poor choice of models.

Depending on the nature of the actions performed, the average duration of the battery grinder's operation is 20-30 minutes. The battery capacity is sufficient for grinding for 40 minutes, and for sawing concrete - 20 minutes.

Design and principle of operation

Main components:

• robust plastic case with ventilation holes in two parts, connected by screws;

• electric motor;

• a gearbox for transferring rotational energy from an electric motor to a spindle with a mounted disc. Consists of:
  • two bearings and a planetary gear on the axle;
  • clamping nut at the end of the shaft;
  • a sun gear pressed into the armature axis;

• release clutch to prevent reverse travel when the wheel is jammed;
• device for adjusting the spindle rotation speed;
• overload protection system;
• buttons for soft start and engine start;
• circle nut;
• spindle lock button for disk replacement;
• device for maintaining constant rotation speed during laborious operations;
• anti-vibration system;
• protective cover;

• accumulator battery.

 

The standard power supply voltage for grinders is 54, 36, 24, 12, 10.8 V. As a rule, power supplies are assemblies of batteries from 1.2V (nickel-metal hydrite or nickel-cadmium) to 3.6V (lithium-ion) ...

The best manufacturers for the drive usually use brushless electric motors with increased efficiency, small dimensions, long service life, and low noise level. As a rule, such motors are electronically controlled with a simple implementation of soft start modes, with speed control, maintaining speed under load, for immediate stop.

Job

The cordless grinder is powered by an electric motor driven by a switch or a latching button. When unwinding, the motor shaft transmits the rotational force to the spindle through a gearbox with drive and driven gears with spur or helical gearing.

Sophisticated and expensive models are equipped with a splitting sleeve between the gearbox and the motor in order to prevent kickback to protect against seizure.

Main characteristics

The values ​​of the main parameters determine the reliability, strength, and also the functionality of the grinders.

1. Disc diameter.

The thickness of the cut material depends on the indicator. Standard values ​​are from 11.5 to 23 centimeters.

• 11.5 cm - inexpensive models for easy home use, such as sanding;
• 12.5 cm - for home use in repairs and for professional purposes without processing thick materials;
• 15 and 18 cm - for home and professional use;
• 23 cm - for professional use in construction for cutting all thick building materials. Not suitable for grinding due to high power and size.

2. Rotation speed.

The value indicates the number of revolutions per minute of the spindle, which for modern models is 2800 - 11000. So, with a disc of 18-23 cm, you can run 6000 rpm, and with 11.5 cm - 11000 rpm.

The larger the circle, the less revolutions.

Types and classification

By application class

1. Household.

Models are made with small dimensions and weight. They have minimal functionality with reduced performance due to constant stops for cooling the mechanism.

2. Professional.

Powerful models with additional features for long-term use.

Features of professional angle grinders:

• large battery capacity;
• fast charging;
• good wear resistance of components with a long service life;
• overheat protection;
• increased weight and size characteristics;
• multifunctionality.

By the number of pens

1. One-handed.

They are used for cutting or grinding for wheels up to 12.5 cm. The main handle is the unit body with an additional removable handle fixed on the sides of the gearbox in two positions.

Safety rules prohibit working with one hand.

• mobility;
• high build quality;
• small price;
• ease of use;
• versatility for cutting or grinding.

2. Two-handed.

Powerful models for cutting thick or hard materials with large wheel diameters.

Features:

• multifunctionality;
• large mass;
• high price;
• use for professional purposes.

By size

• Small - length up to 27 cm, height up to 10 cm, for circles 11.5 - 12.5 cm.

• Medium - length up to 35 cm, height 12-13 cm, for discs 15-18 cm.

• Large - length 40 cm, height more than 14 cm, for circles 21 - 23 cm.

Criterias of choice

When choosing a suitable model, the following parameters are taken into account:

1. Battery capacity in ampere * hours - the value depends on the power and time of use without recharging.
2. Voltage - when compared with the capacity, you can roughly determine the operating time at maximum without recharging.
3. Circle diameter - the maximum cut is slightly less than half the diameter.
4. Variable speed - Provides processing of different materials.
5. Additional handle - for comfort.
6. Protective cover - for increased safety.

Video - What to choose: rechargeable angle grinder or network:

Where can I buy

Cordless popular models are purchased in the power tool departments of hardware stores or supermarkets. Plus, new items are easy to order online from an online store or from Ali Express, China's largest online shopping and delivery service.

The best information on angle grinders is provided by the Internet aggregator Yandex.Market, on the pages of which the main characteristics and photos, customer reviews, advice and recommendations - which company is better, how much it costs, and also by direct link you can go to the store to choose budget ones models to buy.

The best cordless grinders

The rating of quality products is made up of models according to the class of use - for domestic and professional use. The positions in the list were determined according to the opinion of buyers and popularity on the pages of leading online supermarkets of power tools, such as 220 Volt, Kuvalda, VseInstrumenty, etc. It is noteworthy that Russian-made models are not included in the presented list for objective reasons.

TOP 6 best household battery grinders

DeWALT DCG405NT

Brand - DeWalt (USA).
Country of origin - China.

Standalone LBM model for cutting and grinding operations with metal or other material. The unit with a disc diameter of 125 mm is powered by an 18 V battery sold separately. In the event of a kickback, the electronic Kickback Brake stops working immediately, increasing safety. Internal components are reliably protected from damage by an anti-corrosion metal housing.

In case of overload, an automatic shutdown occurs to prevent damage. The load is reduced thanks to the soft start. The spindle lock simplifies tool change. The mesh filter on the vents traps dust.

• mobility;
• high performance;
• light weight;
• ergonomic design;
• excellent build quality;
• stylish design;
• long service life;
• no overpayment for battery and charger (charger);
• good value for money;
• protection against accidental activation;
• case included.

• for stable operation, a large capacity battery of more than 5A is required;
• there is no fixation of the start button, which is noticeable during long use.

Video review:

WORX WX803

Brand - Worx (Germany).
Country of origin - China.

Cordless model of a Chinese-made angle grinder for cutting and grinding metal. High performance and rotational speed are driven by a powerful 20V battery powered motor.Comfortable operation is ensured by a slim body design for precise tool control. With prolonged use, the load on the user's hands is evenly distributed by using an additional handle installed on both sides.

The spindle lock allows quick tool changes. A special cooling and ventilation system protects the motor from overheating. The internal mechanisms of the tool are reliably protected by an impact-resistant case. Supplied at a price without overpayment for the battery and charger.

• light weight;
• autonomy;
• simple tool replacement;
• overload and overheating protection;
• the presence of a protective casing against sparks and dust;
• long service life;
• anti-vibration handle.

• pronounced not found.

LBM video review:

Einhell TE-AG 18 Li-Solo

Brand - Einhell (Germany).
Country of origin - China.

A very lightweight Chinese-made model for cutting, stripping and grinding metal workpieces in the workshop, garage or at home. The 11.5 cm circle rotates at a maximum speed of 8500 rpm. In the event of overheating, the tool will automatically shut down to prevent damage or failure. The body protects the internal mechanisms from damage, and the material does not corrode.

Can be powered by a generator. Protection from abrasive dust, sparks or work debris is provided by the blade guard. Heat is efficiently dissipated through the vents in the chassis. The anti-vibration system reduces shaking and prevents white finger syndrome. The ergonomic handle can be installed on both sides for right-handed or left-handed comfort.

• convenient handling;
• low noise;
• with soft start;
• quick replacement of the protective cover;
• the lightest unit in its class;
• metal gear for better thermal conductivity;
• automatic shutdown in case of overload;
• case for a removable key in the handle;
• common battery for the lineup;
• good value for money.

• high sensitivity of the power button for spontaneous shutdown.

REDVERG RD-AG18V

Brand - RedVerg (Russia).
Country of origin - China.

Reliable model of angle grinder for cutting and grinding operations in places where there is no power supply. A common tooling with a diameter of 125 mm is installed. The spindle lock button is located on the gearbox. The guard can be adjusted without additional tools.

The body has special inserts to prevent slipping. The equipment is changed with a special key included in the LBM set. The additional handle is installed in three positions on the body. You can choose the battery yourself, as it is not included in the package.

• mobility;
• three-position additional handle;
• ergonomic design;
• extended service life thanks to ventilation holes;
• anti-slip pads on the body;
• spindle blocking when changing equipment;
• user protection with a special casing;
• small price.

• the start button is not fixed;
• charger is not included;
• low rotation speed.

Video review of the device:

Ryobi ONE + R18AG-0

Brand - Ryobi (Japan).
Country of origin - China.

Fully autonomous model from China under the Japanese brand for surface grinding, metal cutting, and stone trimming. The product easily removes rust or burrs. Small size and small diameter of the circle ensure comfortable use in hard-to-reach places. At the same time, fatigue is not felt from the low weight during long-term work.

One + technology allows you to use different tools with different battery capacities from the Ryobi range. As a result, there is no overpayment when buying angle grinders without a battery included.

The Softgrip ensures an ergonomic fit in the hand, preventing the device from slipping out. Quick change of equipment is done at the push of a button.The ingress of dust or sparks is prevented by the toolless protective cover.

• light weight;
• stylish design;
• fits well in the hand;
• versatility of One + batteries;
• convenient key switch;
• easy installation and adjustment of the protective cover;
• additional three-position side handle;
• special footrest for a stable position in an inverted position;
• excellent build quality.

• low rotation speed;
• rather weak for serious work;
• short-term retention of a charge on small batteries;
• there is no start button fixation.

Video review of the work of angle grinder:

Denzel BLG-IB-18-02

Brand - Denzel (Germany).
Country of origin - China.

An autonomous high-performance model of a Chinese-made angle grinder under a German trademark for cutting, grinding, cleaning metal structures using special abrasive wheels or brushes. The installation of a state-of-the-art brushless motor ensures cost-effectiveness and high reliability. The unit is equipped with a spindle lock and keyless locking of the protective cover for easy disc replacement and adjustment.

The working life is increased by the use of an improved ventilation system that protects the engine from dust. The tool is powered by a dual capacity rechargeable battery capable of sensing the load type and also compatible with other products in the model line.

• increased resource of the brushless motor;
• battery charging indication;
• easy tool change due to spindle lock;
• improved ventilation system;
• high reliability and efficiency of the electric motor;
• comfortable work with a side handle;
• elimination of jerks when turned on by the soft start system.

• pronounced not found.

comparison table

	DeWALT DCG405NT	WORX WX803	Einhell TE-AG 18 Li-Solo	REDVERG RD-AG18V	Ryobi ONE + R18AG-0	Denzel BLG-IB-18-02
Disc diameter, mm	125	125	115	125	115	115
Landing diameter, mm	22.2	22.2	22.2	22.2	22.2	22.2
engine's type	brushless	brushed	brushed	brushed	brushed	brushless
Battery type	Li-Ion	Li-Ion	Li-Ion	Li-Ion	Li-Ion / Ni-Cd	Li-Ion
Voltage, V	18	20	18	18	18	18
Spindle thread	M14	M14	M14	M14	M14	M14
Rotation speed, rpm	9000	8600	8500	7000	7500	10000
Electronic speed control	not	not	not	not	not	Yes
Keyless tool change	Yes	not	not	not	not	not
Dimensions, mm	497x351x156	340x125x274	290х142х108	135x135x310	340x132x140	415x360x280
Weight, kg	1.74	1.54	1.21	1.7	2.15	2.2
Guarantee	3 years	2 years	3 years	1 year	2 years	3 years
price, rub.	9436 - 11450	5909 - 7090	3599 - 3998	3590	4488 - 5 040	7145 - 9700

TOP 5 best professional cordless grinders

Milwaukee M18

Brand - Milwaukee (USA).
Country of origin - China.

A universal model of a stand-alone angle grinder for professional cutting and grinding of metal products or other materials in places where there is no power supply. Equipped with a powerful POWERSTATE brushless motor, capable of making more than 60 cuts of a stainless steel pipe on one battery charge. High performance is ensured even under increased load. It has an increased level of safety thanks to its equipment with an effective braking system. Keyless tool change is performed with FIXTEC nut.

• mobility;
• compactness;
• reliability;
• convenient change of equipment with a quick-clamping nut;
• rubberized handle for a secure grip;
• reduced vibration level;
• with the function of preventing accidental start;
• the presence of a removable dust shield;
• long service life;
• high build quality;
• the presence of a case.

• high price.

AEG BEWS 18-230BL-0

Brand - AEG (Germany).
Country of origin - China.

A universal model made in China for professional cutting and grinding of metal products or other materials in areas where there is no power grid. High performance and increased time are achieved by using a brushless motor. The set does not include a battery, charger and case.

• mobility;
• smooth start;
• protection against accidental activation;
• increased resource and efficiency;
• anti-vibration side handle;
• fast braking system;
• long service life and guarantees;
• excellent build quality.

• without case;
• a battery with an increased capacity is required;
• high price.

Grinder video review:

Bosch GWS 12V-76 Professional Solo

Brand - Bosch (Germany).
Country of origin - Germany.

Compact mini model of a stand-alone angle grinder for cleaning surfaces, grinding and cutting workpieces made of wood, metal, plastic or rebar.

High revs are achieved by installing a powerful brushless motor powered by a 12V battery. The package does not include a charger and a battery.

• powerful electric motor;
• high rotation speed;
• long service life;
• compactness;
• small size;
• ergonomic design.

• weak protection against dust;
• high sensitivity for automatic shutdown;
• high capacity battery required;
• non-standard expensive consumables;
• no speed regulation.

Equipment video review:

Makita DGA900Z

Brand - Makita (Japan).
Country of origin - China.

Standalone LBM model for professional cutting and grinding operations with metal or other materials. The 230 mm disc unit is powered by two 18 V batteries, sold separately. The rubberized case fits comfortably in the hand. You can attach an additional handle to the left or right for convenience.

• mobility;
• high performance;
• ergonomic design;
• excellent build quality;
• stylish design;
• long service life;
• no overpayment for battery and charger;
• simple change of equipment;
• automatic shutdown when the circle stops;
• protection against accidental activation.

• high-capacity batteries are required for stable operation;
• case is missing.

Video review of this angle grinder:

Metabo WPB 36-18 LTX BL230 0

Brand - Metabo (Germany).
Country of origin - Germany.

Mobile construction model of German production for professional work on cutting and grinding metal products or other materials in places where there is no power grid. High performance and long service life are achieved by using a high-quality brushless motor. The rotatable main handle allows for use in tight spaces.

A simple tool change is performed with the spindle lock. Powered by two batteries sold separately.

• mobility;
• high performance;
• slide switch;
• high number of revolutions;
• embossed grip for comfortable use;
• long service life;
• excellent build quality;
• plastic wardrobe trunk.

• it is necessary to use batteries with a large capacity;
• big average price.

Video testing of angle grinders:

comparison table

	Milwaukee M18 FLAG230 XPDB-0C	AEG BEWS 18-230BL	Bosch GWS 12V-76	Makita DGA900Z	Metabo WPB 36-18 LTX BL230
Disc diameter, mm	230	230	76	230	230
Landing diameter, mm	22.2	22.2	10	22.2	22.2
engine's type	brushless	brushless	brushless	brushless	brushless
Battery type	Li-Ion	Li-Ion	Li-Ion	Li-Ion	Li-Ion
Voltage, V	18	18	12	2x18	2x18
Spindle thread	M14	M14	M5	M14	M14
Rotation speed, rpm	6600	5500	19500	6000	6600
Speed ​​control	not	not	not	not	not
Keyless tool change	Yes	not	not	not	not
Dimensions, mm	425x140x180	642x218x309	340x202x88	499x250x158
Weight, kg	5.3	5.2	0.9	8	6.1
Guarantee	5 years	6 years	3 years	1 year	3 years
price, rub.	30500	23771-26147	8678-11600	15299-22730	56799

Safety engineering

Causes of the danger posed by the grinder:

1. The presence of an open section of a circle that rotates at high speed.
2. Sharpness of abrasive discs.
3. Lack of a stable fulcrum.

Terms of reference

1. Developing skills in handling the unit, mastering the principle of even distribution of the load and rejecting a dangerous operation.
2. Monitoring the condition of the working disk for the absence of chips or fractures.
3. The use of separate circles for each type of operation according to the purpose.
4. Observance of attentiveness, calmness and caution. Paying special attention to hidden obstacles, clamps between supports, and when cutting under the weight of the structure or under the weight.
5. Continuous monitoring during tool operation:

• before starting, to prevent a jerk, the wheel should not come into contact with foreign objects, it will not start before being included in the cut;
• the tool must be turned off after performing any operation, avoiding idling when changing position, walking or communicating with friends;
• after grinding or cutting, the disc is stopped against a tree; it is not allowed to lay tools with a rotating wheel.

Mandatory: Use of personal protective equipment.

Happy shopping and good luck!