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Welcome to EFT. We are BYD's official partner for BYD Battery-Box, the global leader for lithium-ion battery production. The Battery-Box products are the perfect solution for your residential energy storage needs.

The award-winning storage systems offer the highest level of safety and efficiency. Due to the modular design, the capacity can be tailored to fit your specific need and expanded at any time as those needs change. Thus, you always have a battery optimized for your situation.








Easy Installation


Always the perfect battery: individually configured for every application.



Easy Expansion


Thanks to its modular design, the Battery-Box grows with your requirements over time.



Simply Powerful


The right battery for all applications and situations (TOU arbitrage, Grid Services, and Back-up Power)

More about the Battery Box