Rank #8 in Best Angle Grinder 2026: 10 Ranked, and the Wattage Claims That Fail
SEESII 21V Cordless Angle Grinder, 2 x 4.0Ah Batteries
Price and rating as shown on Amazon when we collected them. Both change.
The SEESII Cordless Angle Grinder 21V is the cordless entry at number 8 in our best angle grinders guide: a 115 mm brushless tool sold with two 4,000 mAh batteries and a charger for £76.99, rated 4.1 out of 5 from 722 ratings. Most of the numbers in this listing agree with each other. The title says 4.0Ah, the bullets say 4.0Ah and the Included Components line says 2 x 4000mAh — three places, one figure. The top speed of 9,500 RPM appears in both the bullet and the specification field. The 4.1 headline matches the five rating bars, which add up to 100 and weigh out at exactly 4.10.
Two figures do not close. The wattage field reads 800 watts while the power source is a 21-volt battery, and on the listing's own two numbers that is roughly 38 amps; the three mains models in this guide quote 720 W, 750 W and 900 W from a domestic socket. The dimensions field gives 10L x 10W x 20H centimetres, for a tool whose disc is 115 mm across. The comparison below is read off the Amazon listing, not from any testing we have done.
How those 722 ratings break down
An average hides its own shape. This is the spread behind the 4.1 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £76.99 |
|---|---|
| Customer rating | 4.1 out of 5 from 722 ratings |
| Power source | Battery Powered, 21 Volts |
| Wattage (as listed) | 800 watts, with no amp figure given |
| Maximum rotational speed | 9,500 RPM |
| Batteries included | 2 x 4,000 mAh (4.0Ah), plus charger |
| Item dimensions (as listed) | 10L x 10W x 20H centimetres, for a 115 mm disc |
| Manufacturer warranty (as listed) | 3. |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Arrived on time. Assembly easy and batteries were fully charged. Not too heavy. Worked well for the job I was doing and battery life was good”
Verified purchase“Excellent value for money , powerful adjustable speeds and great value for money , many thanks seller”
What it is up against
The rivals it was ranked against in Best Angle Grinder 2026: 10 Ranked, and the Wattage Claims That Fail.
Questions people ask
How many batteries come with the SEESII Cordless Angle Grinder 21V?
Two. The bullets say '2 x 4.0Ah Fast-Charging Battery' and the Included Components line lists '2 x 4000mAh Batteries' with a charger.
What speeds can the SEESII AN04K run at?
The listing gives three settings — 3500 RPM low, 6500 RPM medium and 9500 RPM high — and the specification field repeats 9,500 RPM as the maximum rotational speed.
Is the SEESII angle grinder brushless?
The listing says it is, describing an 'Upgraded Brushless Motor' that eliminates carbon brushes and gives a longer service life than brushed models.
The wattage is 800 W and the voltage is 21 V — does the listing reconcile those?
No. It gives 800 watts in the wattage field and 21 volts in the voltage field, with no amp figure and no explanation of the two together; 800 W at 21 V works out at roughly 38 amps.
What warranty does the SEESII grinder come with?
The warranty field reads only '3.' — no unit is given, so the listing does not say whether that means 3 years or 3 months.
What is in the box with the grinder?
As listed: 1 cordless angle grinder, 2 x 4,000 mAh batteries, 1 charger, 5 cutting wheels, 2 flap discs, 1 stone cutting disc, 1 goggle and 1 tool bag.
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