LiPo battery for launcher

Discussion in 'Mid Power Rocketry (MPR)' started by MIFFRocket, Feb 25, 2020.

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  1. Feb 25, 2020 #1

    MIFFRocket

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    Looking for a recommendation on a LiPo battery to use for my Estes series II launcher. Need a little more kick than 6 C batteries at this time. Thanks!!
     
  2. Feb 25, 2020 #2

    ThreeJsDad

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    A 3 cell Lipo will give you just over 11volts. Check out Hobby King for a 3 cell Lipo and a cheap charger. You will need a balancing charger. I am heading the same way. I have three 3s 750mah lipos that were intended for a helicopter I have. I never flew the helicopter because it scared me a little....LOL I would imagine even a 750mah would last for quite a few launches.

    I am going to run a wire out the bottom of my hand held launcher to the battery as they are not tiny.
     
  3. Feb 25, 2020 #3

    boatgeek

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    I use a 2s 180 mAh 30C battery in the PS2 controller. It works great for CTI and Estes motors and lights First Fires with a short delay.

    Probably any 2s or 3s with a JST connector will work.
     
  4. Feb 25, 2020 #4

    BEC

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    I have an old ElectriFly 1250 3s pack in my primary PSII controller. I had to make an adapter to go from the connector on the pack to the PSII controller's JST connection. There is a similar thread about this here somewhere, in which I posted a picture of this.

    I would recommend 3s....and since boatgeek is getting good results with "just" a 180 mAh pack basically anything that will fit should work just fine. I have even fired the infamous Aerotech Copperhead igniters with my setup.

    Ah - found the picture....

    PSII_LiPoly1.jpg
     
    Last edited: Feb 25, 2020
    FlyBy01 and MIFFRocket like this.
  5. Feb 25, 2020 #5

    ThreeJsDad

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    How are you guys charging the batteries? How many launches are folks getting from something like a 180mah?

    Keep in mind lipos can be pretty nasty. I guy I flew RC with burned down his garage charging one.
     
  6. Feb 25, 2020 #6

    boatgeek

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    I just open the back and pull the battery out to charge it. Our TARC team gets dozens of launches on a single charge. That’s flying CTI, which doesn’t take much current to fire the ematches and they pop and go dead pretty fast.
     
  7. Feb 25, 2020 #7

    BEC

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    Likewise I take it out. Once a season is really all I need to charge that battery.
     
  8. Feb 26, 2020 #8

    ThreeJsDad

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    That is awesome. I had no idea they would last that long. A 750mah 3cell gives about 5 minutes in a RC Plane.
     
  9. Feb 26, 2020 #9

    BEC

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    Well....that depends a great deal on the plane, the power system, and how heavy-handed you are on the throttle. A 750 mAh pack in my Mountain Models EZ Scout would be good for probably three times that. I could easily fly my MM Dandy for nearly an hour on a battery like that. But that's another discussion.

    In the launcher situation remember that you're only providing power at ~40mA for the LED and the beeper and then for ~2A for a second or two to fire the igniter for each launch.
     
  10. Feb 26, 2020 #10

    NateB

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    I use an iCharger 206B for charging Lipos, but that comes from my airplane and helicopter too. For launching rockets, I use a Cobra system with a 14.8 volt LiPo which charges through a wall wart. The system comes from firework displays and is probably overkill solely for rockets.
     
  11. Feb 26, 2020 #11

    ThreeJsDad

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    My DX7 had a built in charger that used wall wart. That reminds me, Hobby King has a Lipo designed to be used in TX's that has an internal charging circuit. I cannot remember the cell count though.
     
  12. Feb 26, 2020 #12

    BEC

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    With respect to what I use to charge that old 3s 1250mAh pack in the picture above.....I've been flying electric airplanes since the early 1980s and have LOTS of chargers. My favorite for up to 4S and about 4000 mAh is the FMA Direct Cellpro 4s family of chargers. Though these chargers have been around since the early days of balance charging LiPolys (mid 2000s) one member of the family is still available: http://www.usastore.revolectrix.com/Products_2/Cellpro-Multi4_3/Cellpro-Multi4_1183
     
    Last edited: Feb 26, 2020
  13. Feb 26, 2020 #13

    ThreeJsDad

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    I flew DLG's most of the time but I had some bigger and faster stuff when I started in RC. The batteries l have were intended for a helicopter I never flew.
     
  14. Feb 26, 2020 #14

    ThreeJsDad

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    Like you I like older chargers. I used a Hobbico field charger for 1S lipos for a long time. It was stupid simple to use and reliable.
     
  15. Feb 26, 2020 #15

    BEC

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    I have the little Horizon EFlite charger for four individual 1s cells that runs on 4 D cells. I use it for micro RCs and also to charge the three 1s liPolys I use to power the LEDs in my night flyer rocket.
     
    Last edited: Feb 26, 2020
  16. Feb 26, 2020 #16

    ThreeJsDad

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    I have a circuit for charging 1s lipos that runs on a USB source such as a power bank. I just ordered an ALT that can run on 1s so that will be handy. I need to get a charger for the 3s packs so I can use them with my launch system.
     
  17. Feb 26, 2020 #17

    NOLA_BAR

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    I use a Turnigy 1000mAh 3S 20C LiPo pack in my PSII controller. Fits the same as picture posted by ThreeJsDad. I also have a Turnigy E3 2S/3S compact charger. So far has worked fine. The PSII uses the small JST 2pin connector which seems rare now.
     
  18. Mar 12, 2020 #18

    Wallace

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    If you have cordless tools (drill/impact, etc.) You already have everything Ya need.
     
  19. Mar 18, 2020 #19

    Adam518

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    Resized_20200317_075320_4106_crop_94_resize_42.jpg 20200317_195529_crop_27_resize_79.jpg 20200317_195654_crop_26_resize_32.jpg JST connectors are getting more rare but can still be found in receiver packs. I picked up 2 Turnigy 950 mAh packs in 3s for $19 ea on ebay & a JST parallel pigtail for $3.

    That gives 3s 11.1v (12.6v fully charged) with 1900 mAh capacity. I believe Estes says 1000 mAh minimum. 950 probably would work fine, but there was plenty of space for 2 batteries.
     
  20. Mar 18, 2020 #20

    BEC

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