A ProDurance module, battery of block can be ordered as a 200 or 240Wh version. next to cells it contains all the battery management and communication modules required for charging and discharging. The modules can be stacked, or put in line or laid on their side. They are extremely compact and lightweight.They are UN 38.3 certified have IEC 62133 testing which allows a IEC 60601 declaration and are suitable for medical use.