Portable energy reserve: PowerMore 250 is the additional battery the size of a drinks bottle for even greater range and longer-lasting trail fun. Compact in size and weighing just 1.5 kilograms, the Range Extender can be easily mounted in the water bottle holder. The Range Extender can be combined with all batteries of the smart system. Suitable for use with the Santa Cruz Vala. 

Simple sytem means the mount is installed to your frame once, then either the battery or included water bottle cage can be mounted with out tools to suit your ride

Requires which is sold seperately.