Combining LiPo cells?

Discussion in 'The Projects Forum' started by susannah, Jun 18, 2013.

  1. susannah

    Thread Starter Active Member

    Feb 14, 2010
    87
    0
    Can i put two 1S lipos together and have one 2S lipo?

    I'm talking normal lipos which are sold in SparkFun.

    Do i just connect wires or what i need to do?

    Thanks
     
    Last edited: Jun 18, 2013
  2. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,032
    In theory yes, you can put batteries in parallel, but problems arise if the two cells are not identical. In factories where this is done to construct battery packs, the cells are chosen to be similar.
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    I believe you can do this quite effectively if you have two batteries of the same brand and condition.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,032
    Yes, I should have added that the worst thing that happens is that the life of the combined cells may be less if the cells are not well matched. This matters for laptop battery packs for instance, but maybe is not so critical in your application. I agree with Georacer - you can go ahead as long as you take some care to match the cells as noted.
     
  5. Shagas

    Active Member

    May 13, 2013
    802
    74
    If you are going to be putting 2 Lipos in parallel then make sure they are the same capacity , brand etc. Also make sure they are both charged up at the same level.
    You probably know this , i'll say it just in case you don't :
    Lipos need special Lipo chargers and if they go above a certain voltage per cell then they can catch fire etc and if they go below 3,0 - 3,2 volts per cell then they die with no chance of recovery.
    Generally it's good not to let it drop lower than 3,4volts per cell and not higher than 4,2 volts per cell

    Just be carefull , Lipos aren't very forgiving and can catch fire if not handled properly.
     
  6. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    I 'd even put the lower bound at 3.7V to ensure the longevity of the battery in the long term.
     
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