ORIGINAL: jester_s1
Measuring the charge put in after a few flights is not as accurate as a measured discharge because some of the charging current goes toward heating up the battery,
If your LiFePO4 packs are getting hot then something is wrong. My Hyperion packs stay room temperature even when charging at 4C. I use the tiemd discharge method. I have found that the Hyperion (and other) voltage testers are way over conservative. Generally by at least 10% to 15%.