Hey All,
As a triple redundancy on my S800 battery voltage while flying, I purchased 2 of these:
http://www.ebay.com.au/itm/1S-8S-Lipo-Battery-Buzzer-Alarm-Low-Voltage-Tester-indicator-ADJUSTIBLE-VOLTAGE-/271258598462?ssPageName=ADME:L:OC:AU:3160
The idea being I set the alarm based on...