Smallest form factor battery for the RRC3 altimeter

Folks,
I am going for a minimum diameter minimum weight 38mm rocket. I have the RRC3 altimeter. Unfortunately the recommended 9v battery doesn't fit well in a 38mm nosecone. Also unfortunate, the Missileworks webstore is down till May. I know they have a small form factor LiPo batter. I believe it is 3.7v. Does anyone have a drawing or dimensions of this thing as well as a description of the connector type?

Thanks
Tom

Something along the lines of these: https://www.valuehobby.com/gforce-15c-160mah-1s-msr.html

For the RRC3, you are going to want a 7.2 V 2S LiPo. This 180 mAh 25C cell has worked well for me on both RRC3 and RRC2+. https://www.hobbyking.com/hobbyking/store/__23135__Turnigy_nano_tech_180mah_2S_25_40C_Lipo_Pack.html
There are several threads posted here on this type of cell. Should be a lot easier to fit this LiPo into a 38 mm diameter NC than a 9V alkaline. Be sure to pick out a 2S capable charger.

IMO- If you are going to get batteries for something as critical as the altimeter for your rockets. Get the best available. Believe me. There is a difference in quality.

https://www.rclipos.com/Hyperion_G3_CX.htm

The smallest battery on that web page I could find was 3.7v and 130 mAh. Is that too small?


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According to this comment from an RRC3 Beta tester, it has worked:

https://www.rocketryforum.com/showt...people-using-for-the-RRC3&p=614146#post614146

The Raven battery is a 10C 1S 130 mAh battery.

The 180 is in a 38mm Black Hawk with a RRC3. I have tested the 120 with the RRC3, but have not flown with it as I did not need the weight savings.

timro said:

According to this comment from an RRC3 Beta tester, it has worked:

https://www.rocketryforum.com/showt...people-using-for-the-RRC3&p=614146#post614146

The Raven battery is a 10C 1S 130 mAh battery.

Click to expand...

The RRC3 is spec'd to work down to 3.5V, so a 1S LiPo at 3.7V nominal should work; however, there isn' t much margin when the battery is closer to the end of discharge and the voltage drops further during high current during pyro events. If you do use a 1S cell, I would be sure it is fully charged before each flight.

Recommend you talk to Jim at Missile Works. He is recommending this battery for the RRC2+ and RRC3; the same battery as spec'd in the 3D printed sleds. I am sure more than a few lipo batteries will work, but some may be better than others, long term.

Bummer. Those are out of stock.


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I've used down to 40mAh batteries in bench testing some altimeters. If you are trying to push performance you will have to do a little testing on your own to verify your setup.

https://www.sparkfun.com/products/731
would be a good choice as well once they are back in stock. I would advise doing a bench test with a 1hr+
"on" time before flying in a rocket.