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Thread: Gremlin battery

  1. #1

    Gremlin battery

    What batteries can I use for the ft gremlin?

  2. #2
    Site Moderator JimCR120's Avatar
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    Most people I am seeing are selecting between 400mAH-850mAH with around 35C. You can use 2S or 3S and make sure the power connector will fit what you have on the Gremlin. You can find 2S and 3S with JST and XT60's.
    Truths in life:
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  3. #3
    Just wanted to follow up on this with a few questions.

    Finally got my Gremlin in the air the other day with the batteries I currently had on hand.

    First was a no name 450mah 2s that is supposedly 25c, the gremlin feels nimble, but not peppy and no punch.

    Second is a set of 3 Turnigy 850mah 2s 30-40c's. Definitely feel the weight here. Decent flight times, but feels like there is no power.

    Third is a set of 2 Turnigy 700mah 3s's 30-40c's. These actually feel good, and have enough punch for me to attempt to do flips, rolls ect (mostly resulting in crashes at this point in my limited quad experience)

    I'm looking at getting some more batteries for this quad and I'm not sure where to go. Should I ...

    1 - Get some more 600-700 mah 3 cell batteries

    or

    2 - Try some name brand 450-500mah batteries with higher c-ratings.

    I guess what I'm trying to get at is this. Are folks running 2s batteries with higher c-ratings able to get their Gremlins to be more acrobatic or do we really need a 3s battery for that kind of thing?

  4. #4
    Fly Angry PsyBorg's Avatar
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    I started with mine on heavy 3s 800 mah 20c batteries from a heli. It was still very agile at 180+ grams. After some changes to fpv gear several time and new gens ace 25 c 2s and 3s 450 mah batteries it rips even better at 157 grams. If you feel sluggish on what you say you have as far as c ratings you need to tune it better or up your rates a lot. These this are mean lil buggers when set up properly.

    Take a peek at my Gremlin build thread I documented the entire process from start to current and have all my settings posted including rates and auto level settings for horizon mode. I would make another rip the sky video but I have a cracked frame and can not replace it with the Carbon fiber one just yet.
    BILLS LAW: Bills Law specifically states that it covers ANYTHING that Murphy may have forgot, omitted, or plain didn't know in the first place. There fore if it can happen it WILL happen to ME.

    Psyborg FPV You Tube channel.. https://www.youtube.com/channel/UC88...L6-KC9qTa2LgVA

  5. #5
    Obsession, not a hobby TazRC's Avatar
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    PsyBorg, I'm curious to know typical Gremlin weight vs Babyhawk. My Babyhawk AUW with TP 325mAh 2S 70C is 95g (23g battery). How does this compare to your Gremlin, and does it have a Delrin or CF frame? Thx!
    On the ol' Interweb: tazrc.com

  6. #6
    Thanks for the info!

    New to multirotors, I'll have to look into getting it tuned correctly. Assuming all goes well there I'll get some more 450 MAH batteries.

  7. #7
    Fly Angry PsyBorg's Avatar
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    O.K. here are some weights. Gremlin build with props, velcro battery strap, and foam camera mount minus any FPV gear is 83 grams.
    The 2s 450 mah gens ace 25c battery is 32.4 g, The 3s 450mah gens ace 25c is 45.6 g, and the monster no name 3s 800 mah 20c I started with is 71.8 g.

    I have a runcam swift micro to put on it but not a vtx agaian as the last video system with a runcam swift mini and 25/200/600 vtx that was on it has moved on to a race quad build. When that system was on it auw was 157g with the 3s 450 pack That will lighten even more with the smaller camera and smaller vtx.

    Currently I have the Josh B Delrin frame.

    This was one of my first flights with the Gremlin at a fat 187 G AUW.



    My other crappy Gremlin videos were all the process of finding a usable video system as that hyperion set up is junk in my mind and I will NEVER buy another CMOS based system for FPV again. Only CCD.
    BILLS LAW: Bills Law specifically states that it covers ANYTHING that Murphy may have forgot, omitted, or plain didn't know in the first place. There fore if it can happen it WILL happen to ME.

    Psyborg FPV You Tube channel.. https://www.youtube.com/channel/UC88...L6-KC9qTa2LgVA

  8. #8
    Obsession, not a hobby TazRC's Avatar
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    Thanks for the info! I miss all the greenery there... but that's it, lol! Now I understand why everyone's wanting to use 3S with the Gremlin. Do you know the weight difference of your frame between Delrin and CF?

    So when it comes time to upgrade my BH to a CF frame, my 2S 325s are going to have to find a new ride.
    On the ol' Interweb: tazrc.com

  9. #9
    Fly Angry PsyBorg's Avatar
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    I do not know the difference as I never weighed the raw delrin frame before I built it.

    If you do go 3s on the Gremlin I suggest short test hops til you have it tuned as stock pids heat the motors fast on 3s and you can fry them or the esc's. Just keep a CLOSE eye on temps for the first few flights as you dial it in.
    BILLS LAW: Bills Law specifically states that it covers ANYTHING that Murphy may have forgot, omitted, or plain didn't know in the first place. There fore if it can happen it WILL happen to ME.

    Psyborg FPV You Tube channel.. https://www.youtube.com/channel/UC88...L6-KC9qTa2LgVA

  10. #10
    Obsession, not a hobby TazRC's Avatar
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    Thanks for the tips!
    On the ol' Interweb: tazrc.com

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