ORIGINAL: jgg215

After losing two planes due to unexplained power failures(all components still functional at the crash site) I switched to using a dual Tech-Aero dual lipo system, similar to Arch. The weight of the dual power system using 350mah 2s lipos is only 100 grams and that includes two switchs. for an electric power system you can drop the second battery and connect to two cells of the main battery through the balance connector as the primary source.
If you choose the regulator voltages appropriately, you will not have to charge the backup receiver battery, just check it every few flights. The dual switches allow you to confirm that each power path is functional prior to each flight. This power setup is only 72 grams with full redundancy.
I also had Ed put in JST connectors for the regulator battery connection. This eliminates any wire splicing(failure point) and will prevent you from ever plugging in a lipo directly to the receiver(Murphy issue).

John