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  1. Member Since
    Jul 2007
    Posts
    117
    Jan 14, 2009, 10:50 PM - Fan hook-up...which batteries? #1

    In my helmet, I recently installed 2 squirrel box fans hooked up to a single 9 volt battery. Is there any advantage to using 2 AA or 4 AAA batteries instead of the single 9 volt? The single 9 volt seems to have a limited life while running the 2 fans.

    Any suggestions or ideas would be appreciated. Thanks.
  2. cojake's Avatar
    Member Since
    Sep 2007
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    497
    Jan 14, 2009, 11:19 PM - Re: Fan hook-up...which batteries? #2

    I would think most squirell cage fans run on 9 -12 volts DC. AA batteries are only 1.5 volts each. If you wired 4 of them in series you would only have 6 volts. Having 6 to 8 batteries would be too cumbersome for me.
  3. Member Since
    Feb 2007
    Posts
    49
    Jan 14, 2009, 11:29 PM - Re: Fan hook-up...which batteries? #3

    9V batteries can only source a very limited amount of current, usually around 150 mA; a single AA battery can provide much more current, but at the expense of low voltage and weight.

    I would like to install a lithium-ion pack into a helmet in the future; Li-Ion packs, while more expensive, can provide a LOT more current than a 9V in a comparable space. For example, most cell phone batteries are 3.7V ~1000mAh; two of them in series can probably power a correctly sized fan for a while. Downside of rechargeable batteries is the special charger needed (especially for lithium-ion), and a 9V is just more convenient.

    I'd stick with the 9V in this case. Remember that your two fans are each drawing current, and I assume you have them in parallel for maximum power and airflow circulation; that draws a ton of power from a standard 9V battery. You might want to look into lower-current fans; motors use more current than almost any other standard device, and that's the big problem here.
  4. TD2253's Avatar
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    Jun 2007
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    Jan 15, 2009, 12:31 AM - Re: Fan hook-up...which batteries? #4

    I used a squirrel/blower fan attached to a switched 9 volt battery box. You'd want to attach each fan to it's own 9 volt since one will only last under 2 hours of continuous operation. Or, run only one fan and when it runs out of juice, turn on the other fan which will give you approximately under 4 hours of operation.

    Last edited by TD2253; Jan 15, 2009 at 12:37 AM.
  5. A'den Kyramud's Avatar
    Member Since
    Jul 2008
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    Jan 15, 2009, 12:32 AM - Re: Fan hook-up...which batteries? #5

    or just hook up another 9V, so you have one to each fan...they'll last longer that way.
  6. adonian's Avatar
    Member Since
    Oct 2008
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    1,882
    Jan 15, 2009, 2:48 AM - Re: Fan hook-up...which batteries? #6

    Arakus, where did you get your fans? I want to get me a set of them so my FAT head won't be dripping into my eyes

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