Fr Robert Ballecer, SJ It 's been made clear to me in rcgroups com that unless I missed it in ...

[G+_Steve Prior]

Fr. Robert Ballecer, SJ It's been made clear to me in rcgroups.com that unless I missed it in the KH podcast there should be some guidance for KH250 newbies that since the initial config has no low battery warning or telemetry how to decide when to stop flying to avoid over discharging your battery and killing the pack.  I started out flying the quad until it felt sluggish which seems to have over discharged the battery because I didn't know better.  A primer on cell/pack discharge voltages sooner rather than later would probably help many people.

[G+_Adam Schweitzer]

Totally agree, figured that out eventually when trying to charge my batteries the first time and they weren't recognized as 3S. Ordered a few Lipo voltage alarms so now I have no doubt when to bring it down.

[G+_Michael Heinz]

I'm pretty sure the Flip controller has a voltage sensor on it?

[G+_Steve Prior]

The Flip controller doesn't see the battery pack voltage, just the regulated voltage supplied to it by the ESCs, so no.

[G+_Michael Heinz]

I just looked at a diagram for the controller, there's a place for a voltage sensor and for a buzzer.

[G+_Michael Heinz]

http://www.hoverthings.com/media/catalog/product/cache/1/image/1200x/040ec09b1e35df139433887a97daa66f/f/l/flip32layout.jpg

[G+_Michael Heinz]

So, what you would do is connect the voltage sensor to the balance cable from your battery, and add a piezo buzzer for an audible warning.

 

How you configure it will depend on which firmware you use.

[G+_Steve Prior]

I'm learning that there's more to learn about this.  It's being suggested to a LiPo pack shouldn't be discharged much below 3.7V and at around 3.1V you risk damage to the pack.  So if you do nothing more than time your flights there would be a procedure to determine the safe flight time before recharge.  I think these sorts of things should be covered so that even with the current config people can learn to fly without damaging their packs.

[G+_DeWayne Shorts]

Thats how I run mine too. A warning at 3.7 per cell gives you enough power to bring it home and land without risk of damage. Once you fly like that for a while you will get a good sense on how long you can fly. Remember, you can always swap your pack early. The better you treat them, the better they will treat you. 

[G+_Steve Prior]

I got a Taranis radio with telemetry and the sensor for it, but didn't know what voltage to warn at. My point in this post was that there are non obvious questions to ask that someone watching just the podcast might not know and therefore could damage their battery pack.