Einhell Power X-Change USB Power Bank Adaptor TC-CP 18 Li USB Review

The Einhell TC-CP 18 Li USB is a compact adaptor designed to slide onto any 18V Power X-Change battery, effectively turning it into a rugged portable power station. Featuring two USB ports, it allows for the simultaneous charging of two devices, such as smartphones or tablets. It is part of the 'Solo' range, meaning it is sold without a battery or charger, intended for users who already own Einhell cordless tools.

In testing, the adaptor is incredibly straightforward; it clicks onto the battery just like a drill or sander would. The 2.1A output (or split between two ports) is sufficient for modern smartphones, though it lacks the 'Fast Charge' or 'USB-C PD' speeds found on dedicated high-end power banks. The rugged build quality makes it far more suitable for workshops and garden use than standard plastic power banks.

Financial savings are indirect; by repurposing existing lithium-ion tool batteries, you avoid the embedded carbon and cost of purchasing separate portable chargers (typically £20-£40). In a UK power cut scenario, a standard 4.0Ah tool battery could recharge a typical iPhone roughly 4-5 times, providing a reliable emergency backup without needing to draw from the grid during peak times.

No installation required. The unit slides onto the battery rails and is held in place by the battery's own locking mechanism.

Negligible. Running costs are simply the cost of electricity required to charge your Einhell tool battery, roughly 2-4p per full charge depending on battery size and your current UK tariff.