I’m going to throw a wrench in the discussion about ignition batteries, as I believe when it comes to ignitions more volts are not always better. You use a lot less power with lower voltages.

I have been running my DL50 on a one cell LiP0 >> 4.2 V << from the moment I first started the engine. I have over 50 flights and no problems. The engine has never flamed out on me. I have run the battery down to 3.3 V with no discernable performance issues.

I did some research on ignition voltages after I fried my Fuji ignition module when my voltage regulator shorted that was regulating a 2 cell LiPo. I decided to try the one cell LiPo and eliminating the regulator after reading the following test done by CH ignitions. The DL50 use the same ignition modules as CH Ignitions.

Bound_4_Hell


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I just have done some battery drain tests.
All tests were done at 8000 RPM. .A new single cylinder, Version 2 CHXL Ignition.
7.2 Volts -725 MA
7.0 Volts -675 MA
6.0 Volts -650 MA
4.8 Volts -475 MA
3.7 Volts -375 MA
3.0 Volts 300 MA
2.5 Volts 250 -MA
2.0 Volts - 175-MA -Weak spark, Do not know if engine would run, probably not.

Under 2 volts Ignition dead. Ignition still working but Hall Effect dead. We have done test runs and the engines run fine down to 3.2 Volts. Why use any thing over 4.8 volts. Three Nickel Metal Hydride would probably be OK. 3.6 volts.
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You can find the whole document here. It’s called “ STUFF WE HAVE LEARNED “

http://www.ch-ignitions.com/tech.html#pwr