Coldpower Adapter

The Coldpower Adapter is the essential accessory for ultimate Coldcard security – enabling fully air-gapped Bitcoin signing without USB power, using only a 9V battery (not included!). Perfect for Coinkite Coldcard Mk4/Q: Disconnect from cables, protect against juice-jacking attacks, and sign PSBTs 100% offline.

USB-to-9V Step-Up: Insert battery, connect Coldcard – complete independence for field operations or paranoia-level HODL. Cable not included, use standard 9V blocks (rechargeable okay).

Buy your Coldpower Adapter from Copiaro – indispensable for Bitcoin hardware wallets. Make your Coldcard battery-powered: Pure air-gapped BTC sovereignty, no compromises!