light and small 9V battery for project

Discussion in 'General Electronics Chat' started by count_volta, Jan 18, 2013.

  1. count_volta

    Thread Starter Active Member

    Feb 4, 2009
    435
    24
    I am looking for a battery that has either 9V or a voltage that I can connect in series to make 9V. My load will draw about 150mA, but I would like to be on the safe side and have the battery discharge current be at least 200mA.

    Here is the tricky part. This battery will go on a medium RC helicopter to power electronic sensors for a robot I'm making.

    I am guessing on this and will know more details after the helicopter actually arrives and I do some weight tests, but the weight of the battery (or batteries in series) should be about 20 grams at the most.

    I don't care if its a primary cell or secondary cell as long as its not ridiculously expensive.

    Does such a battery exist?

    Thank you
    -Gene
     
  2. SPQR

    Member

    Nov 4, 2011
    379
    48
    Check out allaboutbatteries.com and you'll see that a single alkaline AA battery weighs 24 grams.
    An alkaline long life AAA has 1120 mA hours.
    www.powerstream.com gives the weights of a huge number of batteries.
    www.batterycountry.com gives hearing aid battery weights, and their low mAh.

    You may have to readjust your criteria.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    Try taking apart a busted iPod or similar. They contain some awesome flat batteries.
     
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,061
    3,823
    Go to you local hobby store that sells parts for R/C airplanes. The Lithium-polymer batteries allow sizes that are amazingly small vs. 10 - 15 years ago.
     
  5. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The Li-Po 7.4V (8.4V when fully charged) 180mAh battery for my RC electric model airplanes weighs 11 grams. A 200mAh battery weighs 13 grams.

    3.7V (4.2V when fully charged) 150mAh Li-Po cells weigh 4.15 grams each. Add the weight of connectors.
     
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