mog1 mog2 and the travel version always have battery problems. 
please put an iphone battery to last longer. 
add a usb plug for express charging without having to be in the cradle base. in the car for example, it would keep the battery if it had a plug to charge via usb.
but the battery life when unplugged from the power supply is still what is lacking in the device to be wonderfull  . 
cell phone battery gives more life in modern devices,    and where is the mini usb plug toi add extra-power in road.... covering base out.....