??? about lipo batteries

[Jackson]

Just wondering why you set your failsafe on throttle to a negative number? If you lose radio signal, won't the quad just drop out of the sky?

Yes it will. With the FS things must be different at +38 it would be cranking pretty hard, hover is basically ZERO/midpoint. One has to decide what they prefer, a gentler landing like yours sounds OK, but the motors would continue to run till you can get to it, re-establish contact, or the battery drains. If it's far away, which is usually the case, and falls into high grass, gets caught on a tree (anything that will prevent the motors from spinning), the motors and maybe the ESCs will be toast. Sound logical? It's a personal preference.

 

[RENOV8R]

Yes it will. With the FS things must be different at +38 it would be cranking pretty hard, hover is basically ZERO/midpoint. One has to decide what they prefer, a gentler landing like yours sounds OK, but the motors would continue to run till you can get to it, re-establish contact, or the battery drains. If it's far away, which is usually the case, and falls into high grass, gets caught on a tree (anything that will prevent the motors from spinning), the motors and maybe the ESCs will be toast. Sound logical? It's a personal preference.

Makes perfect sense, like you say it's a personal preference. May have to rethink me setup. The other downside of having it set to partial throttle for failsafe is if you are working on something on your bench and have it powered up, if you make the mistake of turning off the radio before you unplug your quad, well..............you know..................I know cuz I did it and I still have the marks on my hand to prove it hahaha

 

[Jackson]

I know cuz I did it and I still have the marks on my hand to prove it hahaha

Ouch!

 

[GJH105775]

I'm still confused about these darn lipos. All I've been able to research on line says don't overcharge them and don't drain them too much (with varying opinions on how much is too much). To store them charge them to about half capacity. ? I think. I've recently received no less than 7 new lipos. I just don't understand why they were all shipped to me slightly overcharged. 22.2v battery checking at 24v., 3.7v checking at 4v, for a couple of examples. I had 2 batts for my first quad, and managed to kill them fairly neatly. I suspect I didn't know how to care for them properly. Well, I HOPE it was my fault that they didn't seem to last very long. So I've been searching for definitive information on how to make these new ones last as long as possible. Without a lot of luck so far. Any ideas?

Storage voltage is usually written on the package (99% of the time it will be 3.7v per series). Many chargers will charge to ~4.2v per series, and the point where you stop is really opinion, do you want a few extra seconds of flight time that will cost you a battery sooner, or save a battery longer and fly a little less? I usually discharge to 3.5 per series on my racing batteries, and 3.7 per series whenever I can, mostly on my bigger batteries.

 

[mtnmanfpv]

Have learned a lot about the lipos in the past weeks. Received a charger, Turnigy TB6B, and made all the difference in the world from the cheap little usb charger I was using. The Turnigy also restored the 1S cells I thought I had ruined. As a side note, I was playing around with my first quad, the DiscoveryHD, and realized that the plastic body and blade guard unit will just snap off and back on. That piece of plastic weighs 32 grams. I took my little bird out, without the body and with one of the Turnigy re-generated batts and hit the throttle. That little pos took off like a freakin' Estes Rocket!!!! Straight up and out of TX range before I could react. The thing is fun, but I'm really disappointed with all of the free play in the Tx sticks. This makes it really difficult to control it well, especially when trying to hover. (You get what you pay for.)