I was flying with my 26 gas when the engine suddendly lost power, land the plane and discovered that the ignition battery fell under 4,4 volts,that is the power loss explication. The problem is that even under 4.4 part of the charge is still avilable but completely unuseful. I suppose that the only metod to full exploit the charge of the ignition batt. is to avoid the voltage to fall under 4.4 that means 5 cells instead of four (I am using 4) comments requested.

Paolo,


There was a thread asking exactly this question: http://www.rcuniverse.com/forum/m_4235556/tm.htm.
Please look into it.

Amari,
A 4-pack will have 6 volts right after charging. When down to 4.4V, it is pretty much drained. Old cells and thin wires will reach the 4.4V limit sooner.
With a 5-pack, spark energy is the same because it does run off the voltage oscillator cirquits which are processed by the electronics, but directly after charging the battery voltage will be above 6V, in fact it is at about 7.5V which is out of specification range. If you want to use 5 cells, use NiMH only, and let the charge voltage taper off for at least 15 minutes before switching on the ignition.