LEGO Kai's Dragon Mech Battle Pack (71851)

NINJAGO · 85 pieces · 3 minifigures

From £7.49 at Kidinn · 17% off

Not retiring yet (on sale since 2026)

LEGO Kai's Dragon Mech Battle Pack (71851)

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Compare prices (UK)

Regular price £8.99

See it at Kidinn, £7.49

Buy now: £1.50 cheaper at Kidinn than on LEGO.com UK today.

. Amazon offers can be third-party (marked).

Similar sets with bigger discounts

Price history

Lowest price today: £7.49; at Kidinn
Lowest we’ve recorded: £6.99; Kidinn, 13 Oct 2026
LEGO’s regular price: £8.99; today’s lowest is 17% off
Tracked since: 8 Oct 2026; 3 price changes since

Price records (8)

22 October 2026 · Kidinn£7.49
16 October 2026 · Kidinn£6.99
15 October 2026 · Kidinn£7.00
13 October 2026 · Kidinn£6.99
10 October 2026 · Argos£9.00
8 October 2026 · The Entertainer£9.00
8 October 2026 · John Lewis£8.99
8 October 2026 · LEGO.com UK£8.99

Prices at LEGO.com UK, Amazon.co.uk, Argos, Smyths Toys, Very, John Lewis, The Entertainer and Kidinn, checked daily. A line breaks when a store was out of stock or not selling the set.

LEGO Kai's Dragon Mech Battle Pack in other countries

The lowest price today in each country where LEGO sells it, converted at the European Central Bank’s rate. Delivery across borders isn’t included: most stores only ship inside their own country.

CountryLowest priceIn GBPStore

AustraliaBest priceBig WA$10.00£5.24Big W
PolskaMedia ExpertPLN 27.99£5.37Media Expert
SchweizBrackCHF 6.15£5.59Brack
UK(this page)Kidinn£7.49£7.49Kidinn

Show all 13 countries

Exchange rates of 22 October 2026.

Resale value

What the LEGO Kai's Dragon Mech Battle Pack actually sold for on BrickLink, the LEGO-owned marketplace, in the last 6 months.

New

£6.71

Median of 7 sales (worldwide), from £5.91 to £12.76

-25% vs LEGO’s regular price (£8.99)

Used

No sales in the last 6 months.

Sales on BrickLink, updated daily (last update 23 October 2026). Sold in US dollars, shown in British Pound at the ECB rate of 22 October 2026. Few sales mean a less reliable figure.

Set details

Pieces: 85
Minifigures: 3
Ages: 6+
Released: 2026
Set number: 71851
Theme: NINJAGO
Price per piece: 8.8pat today’s lowest price
LEGO.com rating: 4.8
LEGO Insiders points: 72

LEGO Kai's Dragon Mech Battle Pack building instructions

Instructions bookletPDF, 9 MB

Official instructions from LEGO.com, free to download. The LEGO Builder app has them too, many with 3D steps. All instructions on LEGO.com

LEGO Kai's Dragon Mech Battle Pack parts list

70 pieces in 31 different parts and colors, plus 3 minifigures.

Minifigures

Earth Monster
Kai (Draconus Form, No Wings or Tails)
Sora, Mask (Draconus Robes)

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Parts list: Rebrickable.

About the LEGO Kai's Dragon Mech Battle Pack

Boys, girls and fans of the NINJAGO® Dragons Rising TV show ages 6 and up can enjoy hours of imaginative play with the LEGO® NINJAGO Kai’s Dragon Mech Battle Pack (71851) building set. This playset features a dragon mech toy with posable legs, large wings, claw hands and an upper body that rotates 360 degrees, plus a cockpit to place a minifigure inside. This great value ninja toy also comes with 3 minifigures: Kai with 2 sword accessories, Sora with 2 swords and an Earth Monster toy with clawhands, letting kids enjoy hours of adventures as they act out scenes from season 4 of NINJAGO Dragons Rising. The LEGO NINJAGO range of building sets and adventure toys for kids includes detailed mechs, dragons and temples so fans can role-play awesome ninja action. Kids can build each playset with confidence using the LEGO Builder app – zoom, rotate in 3D and track progress with easy-to-follow digital instructions. Set contains 85 pieces.

MECH TOY FOR KIDS – Kai’s Dragon Mech Battle Pack (71851) building toy lets boys and girls ages 6 and up role-play action from season 4 of the NINJAGO® Dragons Rising TV show
POSABLE DRAGON MECH – The dragon mech has posable legs, large wings, claw hands and an upper body that rotates 360 degrees, plus a cockpit to place a minifigure inside
3 NINJAGO® MINIFIGURES – This ninja toy comes with Kai, Sora and a villainous Earth Monster for fans to play out action-packed good vs. evil battles
ACCESSORIES – Each NINJAGO® character minifigure has at least 1 weapon accessory for enhanced play value: Kai has 2 swords, Sora has 2 swords and the Earth Monster has claw hands
SMALL GIFT FOR KIDS – This great value small LEGO® set provides a fun build-and-play experience and is a ninja gift idea for kids with a passion for fantasy and adventure toys
MORE NINJA ADVENTURES – Discover other LEGO® NINJAGO® toys (sets sold separately) featuring detailed mechs, dragons, temples and vehicles
A UNIVERSE OF LEGO® NINJAGO® SETS – This extensive collection of kids’ toys lets ninja fans and children escape into an immersive fantasy world for imaginative play with their ninja heroes
DIMENSIONS – This 85-piece ninja toy playset features a NINJAGO®dragon mech standing over 3.5 in. (9 cm) high

Description: LEGO.com.

LEGO Kai's Dragon Mech Battle Pack: FAQ

Is the LEGO Kai's Dragon Mech Battle Pack retiring?

Not yet: the LEGO Kai's Dragon Mech Battle Pack isn’t flagged as retiring. LEGO.com UK doesn’t list it as “Retiring soon”. We check every day and will update this page the day that changes.

How much is the LEGO Kai's Dragon Mech Battle Pack?

The lowest price we found today is £7.49 at Kidinn, out of 5 stores selling it today (regular price £8.99). Prices change often: this page is updated every day.