Monitor Battery Levels (usage fluctuates)

Immortal_Conqueror:
Good idea, I'll be sure to include that feature.

Here's a good log I found.

Looks comprehensive.
Ones i have seen are paper and slightly simpler, i will try to get a copy at the W/E.
(CAA seem to like paper with lots of signatures).

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CrossRoads:
Check sparkfun.com, they have several "fuel gage" chips on breakout boards for monitoring LiPo charging and discharging, etc.

The chips for those seem to be available in 1 or 2 cell types.
My quad however uses 3 or 4 S batteries.
None of the applications docs i have seen show them as being suitable for flying models.

Immortal_Conqueror:
The popular batteries have proper documentation of their voltage changes depending on their battery level.

Yes but they do not give much information about how they perform for sudden high currents.
A 45C battery should not be discharged at a rate higher than this, testing has indicated it could be as high as 100A for a short period. I gave up after that although it may well be possible with enough time and testing.
Any idea how the eagle tree unit works ?