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Pi 4 Dual 18650 Power Base
A 104 x 58 mm deck that carries a Raspberry Pi 4 or 3B+ on four 28 mm standoffs (58 x 49 mm pattern, 2.9 mm through-holes for M2.5 screws from below) directly above two 18650 cells held in three closed 19.0 mm rings. Cell ends protrude 6.5 mm each side for tab soldering, vent slots sit under each cell, and four 4.5 mm M4 holes bolt the whole power module to a robot chassis, van panel or project box.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
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