Any hobby shop that carries LIpos and Rc Helis should have these but if not this is a good choice, I use it on all my heli's.
http://helihobby.com/html/lithium_batteries.html
Lightning Power Onboard Battery Monito
Stop flying while guessing when will your main pack run out. With this inexpensively little gadget you can fly with confidence. Simply hover in front of you and read out the bright LEDs. If one of the LEDs turn RED you know its time to land, its that simple. Designed for one to three cell Lithium batteries and plugs directly to the balancing plug.
9.99
PART#LP-E0201
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- Instructions:
- Match up the positive to positive and negative to negative terminals. In the event that positive and negative wires are mixed up, the Lightning Power Onboard Battery Monitor will not light up. No damage to the unit or battery will occur. just reverse the connection.
- Each cell is at or above 3.3 volts when the corresponding light is green ( ex. 3S Lithium Polymer pack @ 10 volts equals three solid green lights on the monitor)
- Whenever any cell drops below 3.3 volts, a red light will turn on. Tthe battery monitor will work only if the battery is under load ( ex. hovering the helicopter).
- The kit includes the following:
- Battery monitor
- Two 4.5 inch wire extensions (Thunder Power/ Flight Power and Lighting Power compatible)
- Double sided foam tape