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21700 Three-Cell Strap-Down Cradle
A strap-down cradle for three 21700 cells lying side by side. It's for power banks, e-bike packs and high-drain flashlight builds, where almost every printed holder is sized for 18650s. It has two 22.4 mm saddles on a 25 mm pitch, so 21.0–21.7 mm cells drop in with 2.6 mm walls between them. The open ends take cells of any length, including 76 mm protected cells. Slots for a 20 mm hook-and-loop strap and four 4.5 mm M4 holes are on a 108 x 60 mm base.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
18650 Three-Cell Pack Cradle
A cradle chassis for building a 3S (or 3P) 18650 pack: three 18.9 mm teardrop bores on 21.5 mm centres hold the cells in two 8 mm end collars plus a mid saddle, leaving both terminals flush with the outer faces at exactly 65 mm so nickel strip can be welded straight across. 82 x 68 x 34 mm, with raised + / − polarity ribs above each bore alternating for series wiring, four 3.4 mm M3 clearance holes to bolt the pack into a project, and four 12 x 5 mm zip-tie slots through the 3.5 mm base.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.