The LipoShield is a fine product, but it is not designed to help in this situation (plane stuck in tree). The LipoShield is simply a replacement for the low voltage cutoff (LVC) feature of your ESC. You use it with an ESC that either does not have a LVC or with an ESC whose LVC is not correct for lipos.

When battery voltage reaches 3.0V per cell, the LipoShield reduces power to the motor as signal to you that the battery is getting low. It maintains power to the receiver and servos so that you still have control and can land the plane. If your landing happens to be in a tree, power continues to flow to the receiver and servos. If you don't get the plane out of the tree soon enough, the battery will be drained -- and eventually overdischarged -- same as it would without the LipoShield.

- Jeff