Originally Posted by DaveNH
Ahh, ok, the 80% refers to capacity, not voltage. Well, I'll just stick to a 6 minute flight and be done with it for now I guess, until i get a decent charger. We put an awful lot of thought into 8 dollar batteries
Just to make things even more mysterious... New batteries usually arrive charged for storage, i.e. at about half their capacity. Their life can be extended significantly by not discharging them more than halfway for the first half dozen flights. I fly new batteries a few times for 3 minutes; post-flight voltage is around 3.85V.
And yes, batteries = fun but also batteries = $$$