The LTC4120 is a great IC and well designed optimally to handle efficient charging of LI-ION batteries. I was wondering whether the Received power could be amplified and then fed to the LTC4120. In any case, the Receiver and Transmitter are powered devices. If we use just the receiver and amplify the power with a power amplifier configuration and then feed this to the LTC41xx, we would have the advantage of accessing the cellphone tower transmit power anywhere and use it to continuously charge the batteries. Any work being done on this?? I would be very interested in such technology because I have tiny sensors in various locations on an automobile that can all have their own little chargers and batteries thus making them independent of the automotive power systems. An important safety proposition.