The Batshare enables you to use two battery packs and two swicthes to provide Dual-Redundant security to your aircraft system. With the Batshare, you can tolerate a single failure (open-circuit,short circuit, low voltage) i either battery pack, or swith, or battery wiring, without losing radio control.
The Batshare continually monitors both battery packs and switches for the one with higher voltage, and routes that to your Rx and servos. You may combine different size packs. In practice, with two good packs, the Batshare draws power equally from both packs, adding their individual capacities. I.e., if Battery #1 is 6V/1350mAH pack, and Battery #2 is a 6V/2700mAH pack, you will have 4050mAH power suplly onborad, with at least 1350mAH to fly on, in case of a failure.