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Batteries Battery cycling

Discussion in 'Electronics' started by bigone5500, Apr 27, 2017.

< Tx battery question | Partial charging lipos >
  1. bigone5500

    bigone5500 Well-Known Member

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    How often should a battery be charged and then actually used. I have a couple that don't get used. One goes in my 270 CFX and the other I have no use for but don't want it going bad. LiPos are expensive and I want to get the most out of them I can.
     


  2. Tony

    Tony Administrator Staff Member

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    I wouldn't leave a battery fully charged over 5 days max and I would not do that more than a few times. Full charges help kill these batteries.
     
  3. bigone5500

    bigone5500 Well-Known Member

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    What I was actually meaning is, a battery that is not being used and has been put into storage mode, how often should that battery be charged and used? I think of how they hang on the pegs at the hobby shops and wonder how long they have been there. This causes me to think that there is nothing wrong with leaving one in storage mode for a lengthy period.
     
  4. Tony

    Tony Administrator Staff Member

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    I have not read any studies on that part of it, but giving how long they do sit from the time they are put together to the time they have the first charge put in them, I would assume it could be well over a year. So if you use them once a year, you should be fine. Every 6 months would be even better.
     
  5. bigone5500

    bigone5500 Well-Known Member

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    That shouldn't be a problem. Hopefully I can get my 270 checked out and see if it's flight worthy. After the crash, I put new parts in and am unsure about a couple things so I want someone with more knowledge to have a look at it. I can't tell you how anxious I am to fly it though...$450 for a heli and $180 for a Tx...to just look at it on the wall is killing me.
     
  6. murankar

    murankar Moderator Staff Member Armed Forces

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    The big thing is how you stor them. They should be stored at 3.8 volts per cell and put in a cold place. The more you are able to keep the heat out of the packs the better off you are. As for cycling I am not sure if you have to as long as you keep them at storage charge and chilled. I know some folks will put them in the freezer till they need them and then refrdiferate them while in rotation of use.
     
  7. bigone5500

    bigone5500 Well-Known Member

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    So the extreme cold doesn't hurt the cells? It would seem to me that the freezing temps could crystallize the polymer. I guess not as others do it. Just thinking out loud...sorta...
     
  8. Tony

    Tony Administrator Staff Member

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    Whatever you do, do not do your batteries like I do mine lmao. Mine are stored out in the studio where it can get to -20F in the winter and over 110F in the summer. This is hard on them no matter what the voltage of the cells. lol.
     
  9. Geena

    Geena Moderator Staff Member

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    I treat mine like redheaded stepchildren too....LOL. I leave them charged for a week at a time, I`ve over discharged a few of them, and I don`t always storage charge them after a day of flying. I`m getting better at taking care of them though.
     
  10. Tony

    Tony Administrator Staff Member

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    Oh the joys of having a battery sponsor lmao.
     
  11. Geena

    Geena Moderator Staff Member

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    LOL.... Yes, that definitely helps. I also do most of the testing on new packs, so they want me to beat the prototypes up, to see how much abuse they can stand.
     
  12. murankar

    murankar Moderator Staff Member Armed Forces

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    As long as your not doing a freeze thaw freeze thaw freeze back to back you'll be fine. As long as the condensation is dried up your good too
     
  13. Tony

    Tony Administrator Staff Member

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    I don't know if I would freeze them. When you cool them down below 40f, the voltage drops. Below freezing and it drops significantly especially in the cheaper batteries. Just watched a video on this. Fully charged battery, lithium, and at -10c is was below the voltage cut-off and would not run. So fridge may be fine, but I would not do a freezer. Granted though, when you thaw them out they voltage should rise back to around where it was, but I don't know if I would take that chance.
     
  14. murankar

    murankar Moderator Staff Member Armed Forces

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    That's that's the reason for 3.8 volts per cell. That should be about 50%. I have heard that should be safe for the batteries.
     
  15. Tony

    Tony Administrator Staff Member

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    The other thing that worries me is condensation. The video I watched had ice covering the side of the battery pack. If there is even the slightest rip, tear or puncture in the cell walls it could get in there, which could short it out. Just something to be mindful of.
     
  16. Geena

    Geena Moderator Staff Member

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    I`m pretty sure, I would not freeze a lipo. I have head of putting them in the fridge though. as long as they are not exposed to extreme heat, they`ll be fine. I keep all of mine in my hobby room, which is 75 degrees F, and I have had no issues with them so far.
     
  17. murankar

    murankar Moderator Staff Member Armed Forces

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    I heard Dave from progressive rc say it was fine. I am not an expert. Just sayin.
     
  18. bigone5500

    bigone5500 Well-Known Member

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    I'll be storing mine in the house where the AC will keep the temp at about 75. This should be ok right?
     
  19. bigone5500

    bigone5500 Well-Known Member

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    Man the replies are just too fast! This is great!
     
  20. Tony

    Tony Administrator Staff Member

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    Welcome to a hot topic on RCH. It gets away from you in a hurry lmao.
     
< Tx battery question | Partial charging lipos >

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