ORIGINAL: jimmyjames213
I agree that the static load will not equal the dynamic loads; however this should give a rough estimate. Bad batteries would quickly be recognized with this method, and assuming you took voltages every 10 min you could compare your inflight numbers to the “recorded data” and find out how close (or far) the method really is. The point I was trying to get across is batteries last longer than you think, but always compare battery voltage to known data
Just a warning, small batteries can’t deliver high current. Most 350mah nimh batteries are good up to 2-3 amps, go over that and your voltage drops like a rock.
I agree. Smaller packs seem to have a critical voltage at a higher percent than larger packs. It is why I work down to the size of pack I want in the model. The price of small packs is less than 10 bucks, and with careful cycling, monitoring, et cetera, I can use a very light flight pack. I'm to the point such that switching out a rx pack every flight is worth it compared to hauling around dead weight.
As I said, I am flying some pretty light designs.
Having said this, I have some 1500 and 1800 mAh LiFe packs I haul around in trainers and put in 45 minute flights with students and don't worry a bit about battery capacity.