The Long-lasting Longlife For Devices With Low Energy Demands. VARTA Longlife is the most long-lasting in VARTA's battery range. It performs especially well in devices with constant and low energy needs, for example remote controls, wall clocks, radios, microphones or flashlights. Here, the Longlife battery range stands out with long run times and reliable energy delivery. Type: 9V. Voltage: 9V. Pack of: 1.