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48 volt charger on 51 volt battery

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    48 volt charger on 51 volt battery

    Hi there just have a quick question. A friend of mine bought a heavily discounted electric scooter with no charger. We've managed to find a distributer for li ion battery chargers. The problem is they only sell 48 volt chargers, and the scooter is rated at 51 volts, would this be ok? I would think a 48 volt charger should be able to charge a 51 volt battery to slightly below max charge, but I also know how complicated charging these batteries is.

    #2
    From everything I've learned, ideally you would only charge LiON batteries to 80% and way extend your battery life. That would be 41V on a 51V battery, so provided your battery has a BMS, I'd think a 48V charger should work fine for your needs.

    Jose

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      #3
      From everything I've learned, ideally you would only charge LiON batteries to 80% and way extend your battery life. That would be 41V on a 51V battery, so provided your battery has a BMS, I'd think a 48V charger should work fine for your needs.
      A "51V" battery (whatever that is) discharged to 41V would be close to 100% discharged.

      Terminology can be a little confusing:

      a "48V" battery using lithium cells fully charged is really 54.6V (13 x 4.2): a "48V" battery using LiFePO4 cells fully charged is really 57.6V (16 x 3.6)
      a "52V" battery using lithium cells fully charged is really 58.8V (14 x 4.2)

      I have no idea what a 51V battery is. You might want to check what the battery you have really is.

      If it's lead acid, it's different again - and there are different chargers for 48V lead acid and 48V lithium.

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        #4

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          #5
          Where did you find that chart, Fred. I'd like to have the different voltage versions of those printed and in a binder to reference.

          edit - I totally brain farted my post further up. I know that an 18650 varies a little, but they floor out at 3.25-3.5 depending on the BMS. Assuming 3.2, that means a 13S pack will be at 41.6V when drained. DOH!

          Jose
          Last edited by DaHose; 1 week ago.

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            #6
            I think I got it here on this Forum somewhere. Here's the 52V version.

            Note that these are not the bible, just a general average. The actual discharge curves, etc. will vary by the cells being used.

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