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Thread: LifePo safe?

  1. #1
    I have charged a new battery (Zippy 4S1P 4200mAh 30C) and it seems to have bulged down one side, its more like an air pocket and is not solid. I hadn`t used it and it was balance charged correctly along with the others.
    Unfortunately its out of warranty as I got it at the beginning of the year, I got 8 and the other seven are fine.

    Would this be considered safe to use?

  2. #2
    No you will have to dispose of it at the correct place.

  3. #3
    Not abnormal. Did you measure the cells in that pack?

    If the cells after a working cycle differ in voltage by .5% then there is something afoot. More than 1% gets iffy.

    But in the end, even with huge differences, the LiFePo4's won't burst into flames after real problems. Becoming a great smokegenerator is possible.

    Also, if it is a HK Zippy LiFePo4, and you registered the pack by barcode, the warranty is 1 year.

  4. #4
    Thanks.
    I didn`t know about registering them but I will look into it. It hasn`t exploded yet

  5. #5
    I bought a load of them around the same time, and after just two events they're all puffed to hell, same happened to Shockwave; there seemed to be a dodgy batch right around Season 1. They'll run your robot fine without exploding if they're LiFE, but don't expect them to last too long.

  6. #6
    Thanks Rory - guess what, I asked Will what he was using in Shockwave and bought the same! will doubling them up help do you think? two pairs in parallel to give 8s.

  7. #7
    We ran 4 5S packs (33V 8.4Ah) in Bullfrog. They puffed aftere a few charges, but the cell measuring told us that the cells themself were ok, and used them for another 3 years.
    Untill one got drilled and went smokebomb.

  8. #8
    Yeah, it seems to be high current spikes that kill them; I had a few puff up when Big Bully stalled a motor and blow an ESC, and the rest died when I was using them while load testing my new ESCs. In Nuts for Season 1 I designed for 3 packs in parallel, 2 in series to give 12.6AH at 8S. This was to get the current required to run the electric lifter mech as well as the drive. Once the lifter mech was removed I dropped it to 2 packs in parallel (8.4Ah).

  9. #9
    So....
    I now have 7 of these batteries left and I either buy another to have the two sets of four again or I treat them as a 1 set (and 3 spares) and buy something a bit better.
    My winch motor will apparently take 120A and the drives are Bosch 750, all on 8s. Would these be a better bet does anyone think?
    https://hobbyking.com/en_us/turnigy-...lipo-pack.html
    or do I need to go higher? I hadn`t got the winch when I bought the first ones.

  10. #10
    I wouldn't use the nanotechs. Those puff when you look at them.

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