The ResMed Power Station II battery coupler kit allows for the use of two batteries simultaneously.
Using two batteries - doubling capacity. The two batteries sit neatly on top of each other. A Velcro™ strap is included in the coupler kit to hold them more securely if required. Both batteries can be charged together or use simultaneously to power a therapy device (via the coupler) - one battery serving as the primary power source, the other as the reserve.