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How do you discharge batteries?

Discussion in 'Phantom 2 Vision + Discussion' started by JoeyD, Jun 29, 2014.

  1. JoeyD

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    What is the preferred method of discharging your batteries to 8%. It seems like it would take a long time idling on the ground to go from the 15% I have mine set at to 8%.
     
  2. Dirty Bird

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    Temporarily set your second power alarm for 8% and leave her hovering a few feet off the ground. Keep an eye on her and she will start to come down when the battery reaches 8%.
     
  3. iswimmer

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    I fly mine down to 0% until it turns off on its own. I keep it around a foot off the ground for the last few percent. On my two older batteries (~60 flights on each) the last 3% has sometimes happened really quickly so you gotta be on it. I'm sure it's not the preferred method but I have fun doing it.
     
  4. Dirty Bird

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    I'm not sure running the battery all the way down to 0% is a good idea. Li-Po and Lithium-Ions can get so low that the charger will think they are defective and refuse to charge them. Li-Pos also have a nasty habit of bloating when drained too far. If it bloats, it is no longer safe to use. If the low voltage/won't charge happens, you can sometimes recover them by "jumping" them for a few minutes with a battery of similar or slightly higher voltage. This gives them just enough energy that the charger will see them and charge them.
     
  5. Cocoa Beach Kiter

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    I agree. Taking them down to 8% should be fine to keep the battery healthy without risking low voltage issues.
     
  6. iswimmer

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    I have heard that discharging completely is bad but I read in the manual that they recommend going down to 0% periodically and that there is some sort of built in protection against over discharging. The manual mentions discharging to 8% or until it can no longer be turned on. I have never experienced no longer being able to turn it on. I definitely do the 0% thing more than just periodically though.
     
  7. Dirty Bird

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    The manual recommends discharging to 8% once every 20 battery cycles.
     
  8. Cocoa Beach Kiter

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    My assistant limits the second battery alarm to 12%. If I select 8% it reverts to 12% when I write it. Can you set yours to 8%?
     
  9. jonesk32

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    At the end of a flight I will grab the legs like I'm doing a grab landing and then throttle up a little bit. The batteries seem to drain quite quickly.
     
  10. Gobbler

    Gobbler Guest

    Any product recommendations for a Discharger for the P2V? It has only 2 flat electrical leads into the battery. Do the electrical connectors have to be an exact match, or can I use alligator clips?