This Einhell Power X-Change 5.2ah Starter Battery Twin Pack contains: 2 x PX-BAT5 Power X-Change Batteries 18V 5.2Ah Li-ion 1 x Power X-Change 3ah Charger The Einhell Power X-Change Li-ion Batteries are controlled by a micro-processor, which monitors its key parameters such as temperature, voltage and current strength. This provides effective protection against overheating and ensures the right balance for optimum operating conditions. The battery can be charged irrespective of its charge level. An automatic check establishes conditions on which the charging process depends. In normal conditions, for example, the high-speed charging process is started directly. In other conditions, e.g. extreme cold or exhaustive discharge, gentle charging is performed at reduced current strength. This charging method protects the battery and is essential for ensuring a long service life. The intelligent charge control system controls each battery cell individually, ensuring each cell is fully charged. This produces maximum supply of power. Overcharging is not possible, so even a charged battery can remain in the charger. The battery has a 3-stage LED indicator which indicates not only the battery charge, but also extreme temperature conditions. It also has a triple shell design for optimum protection against damage. 5.2AH Battery Features Compatible with all Einhell Power X-Change DIY Garden tools. Compatible with over 300+ Power X-Change products PLUS-technology: More power delivery in a lighter package with highly efficient cells Freedom of cordless operation: No tangled cables and free working Current charge level indicated by 3-stage LED display Housing protected against dust, corrosion and mechanical damage Suitable for TWIN-PACK use in power demanding 36V applications 3.0ah Charger Features 18v 30 minute Power X-Change Charger for 1.5 Ah - 5.2Ah batteries 6-steps charging condition display with charging light indicator. Ready