These Einhell 2x 18V 4.0 Ah batteries are the universal, interchangeable heart of the Einhell Power X-Change system. Compatible with all products in the Power X-Change range, these batteries are good for your pocket, better for the planet, & great for your garden too. Interchangeable, rechargeable batteries produce less waste from manufacturing, comsume less power than having to charge multiple units, & mean that you can switch from tool to tool as you need to, potentially completing multiple tasks on a single charge. You can also expand your potential with these two 18V 4.0 Ah batteries as you will be able to use the 36V range, providing you with more power & more opportunity. Tame nature whilst you protect it, with the Einhell Power X-Change rechargable battery system. Click to see the whole Einhell Power X-Change range.