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Biped Electronics Battery Deck
This black 80 x 70 x 3 mm top deck is part of the 'SG90 Parallelogram-Leg Biped Walker' kit. It bolts onto the Biped Hip Servo Torso's heat-set posts with four M3 screws through 3.4 mm holes on a 64 x 52 mm rectangle. It carries a 4xAA battery holder, strapped on with a zip tie, and a controller on standoffs that screw into a 5 x 5 grid of 3.4 mm holes at 10 mm pitch. A 3 x 4 mm stiffening lip on the underside stops the deck warping or flexing and stays clear of the torso posts. A 30 x 8 mm pass-through carries the servo wires.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
18650 Tank Top Deck
The 130 x 74 x 3 mm lid and battery deck for the 'N20 Twin-Track Mini Tank Chassis' kit. It bolts to the Tank Hull Tub's heat-set corner bosses with four M3x8 SHCS through 3.4 mm holes at ±58/±30 mm. The rear half has two 18.8 x 67 mm open troughs with 12 mm walls for 2x 18650 cells, plus 3 x 22 mm slots for a hook-and-loop strap and lead-wire notches. The front half has a 10 mm grid of 3.4 mm M3 holes for motor-driver and MCU standoffs, and a 20 x 8 mm slot passes the wiring into the hull.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.