AA batteries getting hot

Discussion in 'The Projects Forum' started by homer2121, Mar 24, 2016.

  1. homer2121

    Thread Starter Member

    Jan 2, 2016
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    I am a newbie and this may be a silly question but I am making a AA battery holder that holds 4 batteries in a straight line. The entire thing is made of metal and I have soldered springs to each metal divider to hold batteries in place. I have not connected any wires yet bc when i was testing it to make sure they all fit a a couple of the batteries on the one end we're getting quite hot while the other 2 were not. They are brand new out of the package.

    Why are they getting hot is it because I have no wires hooked up yet or am I doing something else wrong?

    Thanks.
     
  2. DickCappels

    Moderator

    Aug 21, 2008
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    A photo would help a lot.

    One guess is that the metal springs are shorted together by the metal box
     
  3. #12

    Expert

    Nov 30, 2010
    16,298
    6,810
    The outer shell of the batteries is the negative terminal. It's shorting to the frame. Add black tape to the outsides of the batteries.
     
    Last edited: Mar 24, 2016
  4. TheButtonThief

    Active Member

    Feb 26, 2011
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    Straight away, I think I'm making a good guess in that your battery holder is shorting the batteries. Insulate it dawg.
     
  5. homer2121

    Thread Starter Member

    Jan 2, 2016
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    0
    The battery on the left is still getting hot.
     
  6. DickCappels

    Moderator

    Aug 21, 2008
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    If the black stick in the photograph to the right is metal, that's your problem. Use plastic, wood, leather, anything that doesn't conduct to hold your spring contacts.
     
  7. homer2121

    Thread Starter Member

    Jan 2, 2016
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    0
    Ok..i thought the contacts of the batteries needed to touch metal on each side to transfer the current..so I need connect them with wire between each battery?
     
  8. DickCappels

    Moderator

    Aug 21, 2008
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    [​IMG]
    As an example, when you wire two or more batteries in series with a load like the light bulb, the electricity travels through both batteries and through the bulb. If you have a conductor connect the + terminal to the - terminal of a battery, you create a short circuit so that the electricity only circulates within that battery, making it hot, instead of doing what you want it to do.
     
  9. TheButtonThief

    Active Member

    Feb 26, 2011
    219
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    Bad batteries.jpg
     
    Jobe Ha, absf, JohnInTX and 2 others like this.
  10. homer2121

    Thread Starter Member

    Jan 2, 2016
    32
    0
    Ok I understand...thanks for the help...one other question...the tube the batteries will slide inside is steel...it is a bit of a tight fit so does it matter if the batteries come into contact with the steel tube inside(not the contacts on the batteries but the body)?
     
  11. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    That's okay as long as the insulating sleeve on the battery is not scraped off by the tube.
     
  12. SLK001

    Well-Known Member

    Nov 29, 2011
    819
    228
    Don't make the steel tube a tight fit to the batteries. If they swell, they will wedge themselves so tight in the tube that they will have to be drilled out to salvage the tube. Take up the side to side slack in the tube with cardboard or paper.
     
  13. homer2121

    Thread Starter Member

    Jan 2, 2016
    32
    0
    Ok thanks
     
  14. #12

    Expert

    Nov 30, 2010
    16,298
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    Been there, done that, stopped the fire before it did much damage.
    Insert a plastic tube that is bigger than the batteries or wrap each battery in black tape.
     
  15. ian field

    Distinguished Member

    Oct 27, 2012
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    This TS needs to be sternly warned not to mess with the mains.

    They could even hurt themselv'es with "proper" batteries!
     
  16. #12

    Expert

    Nov 30, 2010
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    6,810
    Who said the mains were involved?
     
  17. ian field

    Distinguished Member

    Oct 27, 2012
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    Just nipping it in the bud before the TS gets crispy.

    Like I said - this TS could even hurt themselves with "proper" batteries.
     
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