# Charging and sealing: the engineering estimate

Historical estimate · 2025-07-05

English translation of the Portuguese source. July 2025 AI estimate. The listed component ranges do not reconcile with every headline total. No supplier quotation or built device is established.

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#### Estimated costs (engineering + unit) of the two improvements

| Change | One-off cost (NRE) € | Δ BOM / watch € | Main NRE items |
|---|---:|---:|---|
| **1 – Replace charging pins with Qi charging** | **27 000 – 34 000** | **+0.20** | • Insert or new mould for the case back (8–12k) / • Internal plastic support for the coil (2–3k) / • New PCB version + prototypes (5–7k) / • Firmware / charging tests (≈3k) / • Partial CE recertification (4–6k) / • Mould for the USB-C charging base, if included (5–6k) |
| **2 – 5 ATM sealing (O-ring + LOCA)** | **19 000 – 22 000** | **+0.25** | • Insert or remachining of the mould for the O-ring groove (3–5k) / • “Vacuum → pressure” bench for the final production stage (≈15k) / • Small torque/gluing jigs (1–2k) |