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Thread: Lipo 4S battery in an XMAG

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  1. #1
    Join Date
    Jun 2012

    Lipo 4S battery in an XMAG

    To anyone who's also into RCs, is it possible to put a 4S lipo battery on an xmag? It's only 14.8v, wondering if it's enough juice.

  2. #2
    Quote Originally Posted by livebrando
    To anyone who's also into RCs, is it possible to put a 4S lipo battery on an xmag? It's only 14.8v, wondering if it's enough juice.
    yes and no,

    there are alot of specs that need to be considered when it comes to the lipo.

    i think you need to go up to 5s.

    not sure though.

    no one that i know has come up with a good lipo setup for runing your x-mag off of.

    trial and error.

    you need the voltage specs of the board also.

    let us know if you find something out.

    im working on my own lipo setup right now.

  3. #3
    Join Date
    Jun 2011
    you will need a voltage cutoff so you dont drain your pack too low... other than that i dont see why you wouldnt be able to use a LiPo... Keep us posted with what you come up with!

  4. #4
    Join Date
    Jul 2011
    United Kingdom
    I've just bought 50 x 1.2V 900mah NiMh flat top batteries. Going to have a go at making my own rechargable Emag and 'bone' style Halo packs. Don't suppose anyone has a spare clip or two from a shot AGD battery pack they want to sell to me?
    Last edited by GEE TEE; 10-18-2012 at 11:41 AM.

  5. #5
    Join Date
    Jan 2002
    Halifax, N.S., Canada
    Here is a copy of a battery pack explanation I did a while back.

    14.8V would cause a reduction in power by about 22%. That should still trip the sear, but it would cut into any buffer needed to maintain operational consistency in all instances. That means you better keep the mechanism clean. It would probably be better to add an extra cell.

    Don't go exactly by the rating on the cells or packs. In reality, Lipo cells have a fully charged voltage value of 4.25V so most charger limit it to 4.2V. The minimum safe voltage is 3V so most use a cutoff of 3.3V. That gives a four cell pack a voltage range of 13.2V to 16.8V. The discharge line from 16.8V to 13.2V is fairly linear and results in the 14.8V nominal rating. The calculations show a 15V average but in reality its not perfectly linear so the real average is 14.8V.

    NiMh cells have a fully charged voltage value of about 1.4V but it drops to 1.3V very quickly so the 1.3V value is used for the upper value when determining average operating outputs. The minimum voltage is 1.0V, but the drop from 1.1V to 1.0V occurs very quickly so the 1.1V value is used for the lower voltage. The resulting average is 1.2V which is the industry value used for packaging. A 14 cell pack rated at 16.8v actually ranges from 18.2V to 15.4V.

    Checking the voltage values of the lowest value for each pack type, it shows a reduction in power by 27% compared to the NiMh pack. This is worst than the 22% calculated using nominal values. As the pack gets discharged, you might end up with firing issues using a 14.8V LiPo pack.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  6. #6
    Join Date
    Jan 2012
    Duesseldorf, Germany
    Thank you for the detailed explanation!

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