Flexible, reliable and durable – the FLEXIS chargers from Zehnder Batterien The very high reliability and resistance to mains fluctuations make the FLEXIS chargers your reliable partner in everyday life. The modular charger has an efficiency of up to 94%. The storage capacity comprises around 1,000 charging cycles. The FLEXIS chargers can be used for up to five different battery types. Due to their design, the chargers are perfectly suited for use in three-shift operation.