Arin's Spinjitzu Battle Mech
71839-1 Ninjago 2025 213 parts 3.5% repair risk Easy
Engage in epic battles from NINJAGO Dragons Rising season 3 with Arin’s Spinjitzu Battle Mech (71839). This powerful mech features posable arms and legs that tilt and twist, a rotating torso, and an opening chest to place a minifigure inside. It wields 2 large sword accessories, ready for action. The set includes Arin with his crystal katana sword and a Spectral Dragonian Warrior with their own sword accessory, plus an adorable Baby Riyu model. Create your ultimate fighting machine by swapping body parts with customisable mechs from the 2024 NINJAGO range, such as Cole’s Elemental Earth Mech (71806), Sora’s Elemental Tech Mech (71807), Kai’s Elemental Fire Mech (71808) and Lloyd’s Elemental Power Mech (71817). Prepare for thrilling good versus evil confrontations!
Parts Inventory
| Part | Qty | LEGO price each |
|---|---|---|
![Slope Curved 2 x 1 No Studs [1/2 Bow]](https://cdn.rebrickable.com/media/parts/elements/6047276.jpg) Slope Curved 2 x 1 No Studs [1/2 Bow] 11477 | 10× | €0,06 |
![Slope Curved 2 x 1 No Studs [1/2 Bow]](https://cdn.rebrickable.com/media/parts/elements/6099728.jpg) Slope Curved 2 x 1 No Studs [1/2 Bow] 11477 | 8× | €0,06 |
 Plate Special 1 x 2 with 5.9mm Centre Side Towball 14417 | 2× | €0,16 |
 Plate Special 1 x 2 5.9mm Towball Socket 14418 | 2× | €0,16 |
 Tile Round 2 x 2 with Dragon Head, White Gear in Dark Azure Circle print 14769pr9988 | 1× | Check price → View |
 Slope Curved 2 x 2 x 2/3 15068 | 1× | €0,13 |
 Plate Special 1 x 1 with Vertical Tooth 15070 | 2× | €0,10 |
 Technic Brick Special 2 x 2 with 10.2mm Balls with Holes and Axle Hole 17114 | 1× | €0,38 |
 Plate Special Round 2 x 2 with Center Stud (Jumper Plate) 18674 | 1× | €0,07 |
![Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]](https://cdn.rebrickable.com/media/parts/elements/6521182.jpg) Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] 21459 | 1× | €0,13 |
 Tile Special 2 x 3 Pentagonal 22385 | 4× | €0,13 |
 Wedge Plate 2 x 2 Cut Corner 26601 | 4× | €0,07 |
Repairability
Can you fix Arin's Spinjitzu Battle Mech if a piece goes missing?
3 of the 86 part+color combinations in this set appear in 3 or fewer sets ever made. Lose one of those and a replacement is very hard to find.
Theme average
6.4%
All sets
6.7%
Hardest to replace
More Ninjago sets
Browse more LEGO Ninjago sets related to Arin's Spinjitzu Battle Mech, including models from 2025 and other sets in the same theme.
Build DNA
Parts inventory insights for Arin's Spinjitzu Battle Mech
213 pieces puts this build -53% against the average Ninjago set and -67% against the average 2025 release.
Vs average Ninjago set
Average Ninjago set: 458 pieces across 410 other sets.
Vs average 2025 set
Average 2025 set: 637 pieces across 562 other sets.
Color profile
Dominant color
Black
Unique parts
0.5 pieces per unique type
Repeat factor
Average pieces per unique type.
Most used part
Slope Curved 2 x 1 No Studs [1/2 Bow]
18xResults are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.
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