and there is where I take issue with the h3 manual it states you can use the dual dy5 charger for the flight battery. the h3 battery socket is not usable on the dy5. the new charger is SC4000-4E. I need to head over to h3 thread and see what I can dig up on the charger for compare it to the current h520. oh they may have addressed the real time clock issue with the new ODFM module how ever you may need to keep the h520 e plugged in via usb cable when the vbat is removed. or the remote bat is removed ODFM module is also integrated in to the st16e