Reliable and powerful lithium technology for tough continuous operation. Through the integrated BMS (Battery-Mmanagement-Ssystem), the battery is monitored internally and thus optimally protected. Via smartphone and free app, the state of charge and battery capacity are always under control. Up to 4 batteries can be connected in series or 2 batteries in parallel. A flush-mounted display in the housing shows the battery's state of charge at the touch of a button. The maximum discharge current is 150A (< 4min).