Transmitter Battery

Posted by Todd on May 19, 2014 at 1:26pm

The Iris transmitter is a FlySky ER9x and the manual http://er9x.googlecode.com/svn/trunk/doc/ER9x%20Users%20Guide.pdf does not say anything about batteries, voltage etc.

Currently I am using 8 AA energizer rechargeable batteries which when fully charged give me about 11.1 - 11.2 v total.

How low can I let the voltage go before needing to recharge the batteries?  Is 10.5 v a good cutoff?

Also, can you use other batteries such as a LifePo4 like this one https://www.hobbyking.com/hobbyking/store/__17955__HobbyKing_1500mAH_LiFe_3S_9_9v_Transmitter_pack_.html

What do other people use in the transmitter for batteries?

Thanks.

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Replies

  • Dr. Pete May 22, 2014 at 9:27am

    I had a Parkzone LiPo from flying other models, cut the end and added an EC-3. Tight, but fits fine.

    3701741129?profile=original3701740782?profile=original

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  • Parke @ ParkeFlyer May 20, 2014 at 1:56pm

    I highly recommend using a LiFe battery over a Lipo. We used to sell these along with an adapter for the 9x radio, but no longer. I still fly with this battery though, and have for several years. The LiFe voltage is lower than a Lipo which brings it a little closer to the radio's operating voltage. This allows for a little less energy wasted to heat and a little less strain on the components. Also LiFe batteries have a flatter discharge curve, are not prone to self-disharge like LiPo's. That said, lots of people use Lipos. It's not a bad idea, just LiFe batteries are a better idea, IMHO. :)

    http://hobbyking.com/hobbyking/store/__16764__ZIPPY_Flightmax_1800m...

    • gervais > Parke @ ParkeFlyer May 20, 2014 at 2:32pm

      Well, I would not use a Standard LiPO as well. The Turnigy LiCo Tx battery I proposed, behaves a bit different, drops pretty quick below 12V and does come with a very low self discharge.

      http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16529

      And the 9x Voltage regulator (1A type) sure does not get strained, since the current is only app 120-140mA (including backlight which I´d strongly recommend as well)

      But I know, that the LiFe pack works great as well. Its more or less a matter of taste.

      Btw: I recommended this as well, but the former IRIS charger did not have a LiFe setting:

      Some might prefer to use a 3s LiFePO4 bat instead, because of lower voltage and better behavior at low temperatures, but this battery chemistry requires another charger, offering LiFe settings. PS: The recent charger, supplied with the IRIS (see Update 5), offers a LiFe setting as well. Don´t forget to switch it back when done.

    • Parke @ ParkeFlyer > gervais May 20, 2014 at 3:39pm

      Good to know about this battery as well. I wasn't familiar with "LiCo" formulas. Thanks for sharing the details.

  • gervais May 20, 2014 at 1:37am

    Just take the cheap Turnigy transmitter pack, no soldering required...lasts a lot longer and can be charged by the IRIS charger (at least one app for this slow motion item)

    Looks like this:

    hyglrjik.jpgjq9qnkz9.jpg

    More pics and description here:

    http://www.rcgroups.com/forums/showthread.php?t=2046042

    • Todd > gervais May 20, 2014 at 3:52am

      Thanks gervais.  That's the information I needed.

  • Francis Chan May 19, 2014 at 1:38pm

    I bought that pack for the Iris Radio and this banana plug adapter [ http://www.ebay.com/itm/321104104976?ssPageName=STRK:MEWNX:IT&_... ]

    My AA haven't died yet though so waiting for those to go kaput before charging up the new pack.

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