Voltage Drop

Discussion in 'Ask An Expert' started by TimeFlyr, Dec 4, 2017.

  1. TimeFlyr

    TimeFlyr New Member

    Blog Posts:
    0
    Joined:
    Dec 4, 2017
    Messages:
    3
    I'm using a Sigelei J150 with 18650 3.7v 3000mAh batteries. Today I noticed when I hit the firing button, the battery indicator and volts seem to drop about 25% (haven't noticed this before, but I also don't see the screen when I'm firing of course). Is this a normal thing? Does this mean my batteries are starting to die? I have had these batteries for almost a year now so I wouldn't be surprised if they were dying. I also just recently put in a new coil, but I don't think that has anything to do with it. Any help would be great. Thank You.

    There doesn't seem to be a drop in cloud production, so I'm hoping this is a normal thing.
     
    Last edited: Dec 4, 2017
  2. The Cromwell

    The Cromwell VU Donator Diamond Contributor Member For 1 Year

    Blog Posts:
    0
    Joined:
    Jan 15, 2016
    Messages:
    16,162
    Specifically what batteries and what wattage?
    Some drop is normal even with good batteries. The drop increases as the wattage increases.

    And yes with more useage the internal resistance of the batteries will rise causing more voltage drop than you would get with a newer battery of the same brand / model.
     
  3. TimeFlyr

    TimeFlyr New Member

    Blog Posts:
    0
    Joined:
    Dec 4, 2017
    Messages:
    3
    Its LG HG2 18650s on 70W. I did notice the higher/lower the wattage, the higher/lower the drop. I was just making sure that 1 of the 2 batteries I have in the mod right now wasn't going bad. I know it's not good to have batteries at different battery life in the mod at once. But they do seem to be charging just fine, so I guess they are just getting old. I probably need to get new ones.

    Would you say it's still safe to use these batteries for the time being?
     
  4. The Cromwell

    The Cromwell VU Donator Diamond Contributor Member For 1 Year

    Blog Posts:
    0
    Joined:
    Jan 15, 2016
    Messages:
    16,162
    Sure at that wattage you should be fine.
    compare the voltages on the batteries when you remove them to charge.
    If very different then get a better matched pair.
     
  5. TimeFlyr

    TimeFlyr New Member

    Blog Posts:
    0
    Joined:
    Dec 4, 2017
    Messages:
    3
    Thank you, that was very helpful!
     
  6. The Cromwell

    The Cromwell VU Donator Diamond Contributor Member For 1 Year

    Blog Posts:
    0
    Joined:
    Jan 15, 2016
    Messages:
    16,162
    No problem and WELCOME to VU.
    Enjoy the members and the site.
     
    TimeFlyr likes this.

Share This Page

Close This Message