Custom heavy copper PCBs (usually 3oz and above, and often all the way to 10-20oz) are still needed in high-power electronics in 2026 when extreme current-carrying capacity (>50A traces), superior thermal dissipation, mechanical integrity and durability to thermal cycling cannot be compromised. EV chargers, battery management systems (BMS), solar inverters, industrial motor drives, welding devices, power supplies, renewable energy converters and aerospace/defense systems are