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Kai's Dragon Mech Battle Pack

Kai's Dragon Mech Battle Pack

Set number
71851-1
Theme
Ninjago
Year
2026
Pieces
85
Minifigures
3 total (3 distinct designs) · 1 exclusive
Age
6+
Availability
Retail
Packaging
Box
Box size (L × W × H)
4.8 × 5.6 × 1.8 in (12.2 × 14.1 × 4.6 cm)
Retail price
  • US $9.99
  • Canada CAD $12.99
  • UK £8.99
  • Europe €9.99
Store prices the store's own offer
Out of stock
  • Not in stock since we started checking on 2026-09-27
  • Listed at $9.99
Last checked
View on Walmart
Current market value
: Avg. New $17.79 +78% vs retail · Avg. Used $29.58
  • New median $17.45 · typical $13.24–$21.74 · 28 listings
  • Used median $22.98 · typical $18.48–$43.99 · 5 listings
asking prices · updated
Release date
2026-01-01
Retiring
2027-12-31
Shelf life
2 years
Instructions
Instructions
All 2 instruction PDFs

Minifigures (3)

Parts (37 lots, 1 exclusive part)

QtyPartNameColorSets
4 Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small (Black) 53451 Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Black In 208 sets
2 Bracket 2 x 2 with 1 x 2 Vertical Studs (Black) 41682 Bracket 2 x 2 with 1 x 2 Vertical Studs Black In 183 sets
2 Plate Special 1 x 2, Top Clip [Open O] (Black) 44861 Plate Special 1 x 2, Top Clip [Open O] Black In 357 sets
1 Plate Special 1 x 2 with 2 End Towballs (Black) 3170 Plate Special 1 x 2 with 2 End Towballs Black In 61 sets
1 Technic Pin with Friction Ridges Lengthwise with No Center Slots (Black) 61332 Technic Pin with Friction Ridges Lengthwise with No Center Slots Black In 1,225 sets
1 Brick Special 1 x 1 with Studs on 2 Sides (Dark Bluish Gray) 47905 Brick Special 1 x 1 with Studs on 2 Sides Dark Bluish Gray In 134 sets
1 Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips (Dark Bluish Gray) 98876 Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips Dark Bluish Gray In 21 sets
4 Plate Special 1 x 2 with 5.9mm Towball Socket and Towball (Dark Bluish Gray) 14419 Plate Special 1 x 2 with 5.9mm Towball Socket and Towball Dark Bluish Gray In 229 sets
2 Plate Special 1 x 2 with End Towball (Dark Bluish Gray) 22890 Plate Special 1 x 2 with End Towball Dark Bluish Gray In 344 sets
1 Weapon Hilt Symmetric (Dark Bluish Gray) 66909 Weapon Hilt Symmetric Dark Bluish Gray In 47 sets
8 Plate Special 1 x 2 Rounded with 2 Open Studs (Dark Red) 35480 Plate Special 1 x 2 Rounded with 2 Open Studs Dark Red In 74 sets
1 Plate Special 1 x 2 with Clip Horizontal on Side (Dark Red) 11476 Plate Special 1 x 2 with Clip Horizontal on Side Dark Red In 37 sets
1 Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) (Dark Red) 27167 Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) Dark Red In 5 sets
4 Plate Special 1 x 2 5.9mm Centre Side Towball Socket (Light Bluish Gray) 14704 Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray In 849 sets
2 Bracket 1 x 2 - 1 x 2 Inverted (Orange) 99780 Bracket 1 x 2 - 1 x 2 Inverted Orange In 51 sets
1 Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) (Orange) 54200 Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Orange In 212 sets
2 Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] (Orange) 60897 Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Orange In 81 sets
4 Creature Body Part, Barb Large (Claw, Talon) with Clip (Pearl Gold) 16770 Creature Body Part, Barb Large (Claw, Talon) with Clip Pearl Gold In 25 sets
1 Tile Round 2 x 2 with Gold Dragon Head on Dark Blue Background Print (Pearl Gold) 14769pr0027 Tile Round 2 x 2 with Gold Dragon Head on Dark Blue Background Print Pearl Gold In 3 sets
4 Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] (Pearl Gold) 21459 Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Pearl Gold In 241 sets
2 Brick Curved 2 x 2 x 2/3 (Red) 15068 Brick Curved 2 x 2 x 2/3 Red In 339 sets
2 Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder (Red) 15571 Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Red In 65 sets
2 Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] (Red) 3660 Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red In 455 sets
2 Creature Body Part, Dragon / Thestral Wing with Bar Connection and Marbled Bright Light Orange Pattern (Red) 38547pat0002 Creature Body Part, Dragon / Thestral Wing with Bar Connection and Marbled Bright Light Orange Pattern Red Exclusive
2 Plate Special 1 x 2 [Side Handle Closed Ends] (Red) 48336 Plate Special 1 x 2 [Side Handle Closed Ends] Red In 172 sets
2 Plate Special 2 x 3 with Rocks (Red) 27261 Plate Special 2 x 3 with Rocks Red In 2 sets
1 Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate (Red) 73109 Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Red In 50 sets
4 Tile Round 1 x 1 Half Circle (Red) 24246 Tile Round 1 x 1 Half Circle Red In 111 sets
3 Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] (Trans-Orange) 22388 Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Trans-Orange In 61 sets
1 Flames 5 x 7 x 1 x 1/3 with Studs, Handle (Trans-Orange) 7727 Flames 5 x 7 x 1 x 1/3 with Studs, Handle Trans-Orange In 2 sets
2 Tile 1 x 2 with Groove (Trans-Orange) 3069b Tile 1 x 2 with Groove Trans-Orange In 140 sets
1 Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small (Black) 53451 Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Black In 208 sets extra
1 Technic Pin with Friction Ridges Lengthwise with No Center Slots (Black) 61332 Technic Pin with Friction Ridges Lengthwise with No Center Slots Black In 1,225 sets extra
1 Minifig Neckwear Bandana (Ninjago) (Dark Blue) 15619 Minifig Neckwear Bandana (Ninjago) Dark Blue In 19 sets extra
1 Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) (Orange) 54200 Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Orange In 212 sets extra
1 Tile Round 1 x 1 Half Circle (Red) 24246 Tile Round 1 x 1 Half Circle Red In 111 sets extra
1 Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] (Trans-Orange) 22388 Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Trans-Orange In 61 sets extra

Building instructions

PDFs from LEGO.com. The same booklet is often printed in several versions (e.g. V29 EU A4 format, V39 US Letter format).