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  1. #1
    Join Date
    2nd January 2013
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    192

    Battery suggestions for Eggfinder mini

    I would like some suggestions on what brand battery everyone is using for their eggfinder. I dont trust the one I bought off ebay. Brand names and links would be helpful. Thanks.


  2. #2
    Join Date
    29th May 2015
    Location
    Keller, Texas
    Posts
    556
    I use the 300mah nano-tech. They also fit perfectly on the eggfinder mini nosecone sleds available from CI(VII)

    https://hobbyking.com/en_us/turnigy-...___store=en_us

    Jeff Jones

    TRA 04736
    NAR 75968
    L3 KF5YYI




  3. #3
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
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    2,410
    Quote Originally Posted by PokerJones View Post
    I use the 300mah nano-tech. They also fit perfectly on the eggfinder mini nosecone sleds available from CI(VII)

    https://hobbyking.com/en_us/turnigy-...___store=en_us
    I use a lot of these. They fit really well in a lot of rockets... they'll even fit in an 18mm body tube (well, almost...)

  4. #4
    Join Date
    2nd January 2013
    Posts
    192
    Thanks for the suggestions! Ill look into that battery.

  5. #5
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    975
    I buy Hobby King every time.

    I have had a couple puff up after flights, so keep an eye on that. I think it is the quick change in altitude that gets them. If they go puffy, throw them out.
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

  6. #6
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,445
    You have to be patient in buying them, and check back occasionally. They were in stock a week ago, and now they are backordered...it happens. They are great batteries for our applications.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  7. #7
    Join Date
    2nd January 2013
    Posts
    192
    Hey guys, another question. Can I use this charger that I got with my ebay batteries for the nanotech?

    Click image for larger version. 

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  8. #8
    Join Date
    3rd February 2012
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    So Cal (ROC, TRASD, SCRA)
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    Quote Originally Posted by ascastil View Post
    Hey guys, another question. Can I use this charger that I got with my ebay batteries for the nanotech?

    Click image for larger version. 

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    You probably can, but it's better to get something that allows you to adjust the current and allows you to monitor the voltages. I have a Turnigy P606, they're about $35 from HK, it will handle 1S-6S cells and you can charge multiple batteries of the same type simultaneously, up to 6S (i.e. three 2S 350 mAH batteries). It's also AC/DC, a big plus if you want to top off your batteries in the field. https://hobbyking.com/en_us/pd606-charger-us-plug.html

  9. #9
    Join Date
    2nd January 2013
    Posts
    192
    That charger is on backorder, darn. I feel overwhelmed looking at chargers. My head hurts.

  10. #10
    Join Date
    22nd February 2013
    Location
    Garland, TX
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    3,445
    Quote Originally Posted by ascastil View Post
    That charger is on backorder, darn. I feel overwhelmed looking at chargers. My head hurts.
    I have an earlier version of this one: https://hobbyking.com/en_us/imax-b6a...___store=en_us and really like it.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  11. #11
    Join Date
    29th May 2015
    Location
    Keller, Texas
    Posts
    556
    I also use the Imax B6 charger, seems to work well and has every feature you could want. Looks like Hobbyking has a better price than I paid on Amazon but be careful if the price is too low, apparently there are a lot of cheap knockoffs that don't work or won't last.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    Last edited by PokerJones; 12th July 2017 at 06:08 AM.
    Jeff Jones

    TRA 04736
    NAR 75968
    L3 KF5YYI




  12. #12
    Join Date
    26th November 2009
    Posts
    4,388
    Quote Originally Posted by PokerJones View Post
    I also use the Imax B6 charger, seems to work well and has every feature you could want. Looks like Hobbyking has a better price than I paid on Amazon but be careful if the price is too low, apparently there are a lot of cheap knockoffs that don't work or won't last.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    Listen to Jeff and the good Doctor. Remember if going to store the lipos for any length of time to put it on the "storage" cycle of the charger and take them out of storage every 6 to 8 weeks of "non-use" and put them on the "storage" cycle until you need to use them. When that time comes, juice it up all the way to use it. If you over discharge a lipo, it's toast and forget it. Time to buy new. The 300mah cell should be good for one or two flights. It depends if there is going to be a long wait on the pad before launch and how long it takes to get the thing back. If you have the space and need ballast use a much larger capacity cell and you won't sweat it.
    I had a 40minute wait on the pad at MWP 13 but I had a 1500mah 7.4V lipo feeding an EggFinder TRS. I didn't worry and took me 45 minutes to traipse out to the rocket. Ran for a couple of hours before I could get it turned off and the battery was fine.
    If you are at a launch where you are going to have a long wait with the 300mah pack turned on, I'd start to show some concern after 30 minutes. If it's an easy
    recovery, ok, but if the recovery takes awhile you don't want to run out of battery. Kurt

  13. #13
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,410
    An Eggfinder TX draws about 70 mA on average, so a 350 mAH battery should last about 5 hours. I've had some pretty long recoveries (like one that drifted 5 miles away...), and I've never run a battery down. 1500 mAH is really nice, if you got the space and can afford the weight... it will run for a whole weekend of flying, and then some.

  14. #14
    Join Date
    27th December 2012
    Posts
    266
    Quote Originally Posted by cerving View Post
    An Eggfinder TX draws about 70 mA on average, so a 350 mAH battery should last about 5 hours.
    Do you know how much power is drawn when an Openlogger is attached to an Eggfinder. I've done a couple of test and it appears the logger draws more juice (which makes sense since data is being continuously written to SD card).

  15. #15
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    975
    Do you know how much power is drawn when an Openlogger is attached to an Eggfinder.
    I don't have one to measure but I would guess it would be mouse-power compared to the EggFinder telemetry transmitter. Would be nice if you can get some measurements.
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

  16. #16
    Join Date
    3rd February 2012
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    So Cal (ROC, TRASD, SCRA)
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    2,410
    According to a NXP blog that I found on the subject, uSD cards typically use about 30 mA. They use a little more when they're writing (up to 100 mA) but the duty cycle on the Eggfinder is only about 10%. The actual OpenLog probably uses only a few mA, it's basically just an Atmel ATMEGA328P and a few support components. I've also read that it's highly vendor-dependent... some cards go into a low-power state if they're not accessed within a certain amount of time. I'll do some testing with the cards that I have (they're from different vendors, I have a Sandisk and a Lexar) and let you know what I find.

  17. #17
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,445
    The illusive LiPo of choice referenced above is in stock at the HobbyKing International Warehouse: https://hobbyking.com/en_us/turnigy-...lipo-pack.html

    I just picked up 10 of them for $60 with shipping...I'm unwilling to wait for them to become in stock at the US warehouse to save a few $ on shipping.


    I realize it is poor form to post the same thing in many threads, but I know people like these so I'm getting it out there...Also, works in my sleds too, so a bit of shameless promotion to it I guess.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  18. #18
    Join Date
    2nd January 2013
    Posts
    192
    Well, I got impatient and ordered one from Amazon a few days ago. Thanks for the heads up.

    Edit: Damn, I paid $14 shipped for one through Amazon.

  19. #19
    Join Date
    2nd January 2013
    Posts
    192
    Went ahead and ordered a Turnigy 405 charger. Not the fanciest model I guess but it looks way better than the one that came with my ebay batteries.

  20. #20
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,445
    Hobby King US Warehouse has the 300 mAh Turnigy batteries in stock now.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  21. #21
    Join Date
    19th January 2009
    Posts
    890
    So THAT'S why I had such a hard time getting some of those little batteries.

    I ordered 4 this morning. If I had known they were popular here I would have let people know.

  22. #22
    Join Date
    26th November 2009
    Posts
    4,388
    Remember, if a rocket needs ballast, you can't go wrong with using "usefull" ballast in the form of a heavier battery to supply power to a tracker. (That is of course if you have room in said rocket for it!) Kurt


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