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  1. #1
    mtbr member
    Join Date
    Jul 2012

    building battery packs - question

    im looking at building a couple new battery packs. 6cell 18650 @ 3.7v. I use'to build my own packs for RC cars back when NiMH was the standard however I have little to no experience with Li Ion. If I soldered up 6 cells in parallel (3.7v)

    Is balancing required?
    Do i need a PCB or is this only required for unprotected cells?

  2. #2
    Reputation: SolarCross's Avatar
    Join Date
    Jan 2013
    If you pay the premium for well balanced cells, this would lower the cell failure rate aswell.. make sure to solder on a balance lead plug , so with 6 cells would be 7 wires, and dont run em below 3.4 - 3.6v area I guess or charge em over 4.15v they may stay balanced,,

  3. #3
    mtbr member
    Join Date
    Apr 2010
    No need to wire a balance harness to a parallel pack, but do make sure the cells are matched well when you wire them together. In parallel setup cells will balance them selves. Use protected cells just in case a single cell or more start behaving strange. If possible set the cut off voltage to 3V (under load).

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