The FERREX 20V 4.0 Battery and Charger is a versatile and reliable power tool accessory designed for use with all Ferrex 20V batteries. The battery provides a voltage of 20V, making it compatible with a range of tools and equipment. The charger allows you to efficiently recharge your batteries, ensuring that your power tools are always ready to go. With the trusted FERREX brand behind it, this product is a valuable addition to any DIY enthusiast's toolkit.Battery is 20V lI-ION 4.0AH and the charger The charger is 20V 4.0A and will charge all existing Aldi 20V batteries. The battery has led strip on each side so you know how much power is left in it by colour change. This is the same quality as the older battery and charger but the charger is more compact and the battery in my view is better.