Egg Timer Quark Questions

[Dad of Sapling]

I have the itch to expand my experience and try dual deploy at the MPR level. I'm leaning towards the Egg Timer Quark. I have the skills to do the assembly (I think) and you can't beat the price point if it doesn't work out. My question is about the battery. The information I see calls for a 4 volt LiPo battery. All I can find that are small enough are 3.7 volt. What batteries are you using on the Quark? Am I not looking in the right place for the 4 volt batteries? I've been looking at hobby supply sites and Amazon.
As a side question, are you happy with the Quark, is anyone using it for MPR?
Thanks

 

[David Schwantz]

I have 20 of the things and use a 2 cell LiPo. Anywhere from 300 to 700 mah.

 

[SecondRow]

Page 9 of the Quark users manual sets forth the battery suggestions. You’ll want a 2S LiPo; that’s 7.4V. A 200 mAh 2S LiPo should last all day.

Link to the manual:
http://eggtimerrocketry.com/wp-content/uploads/2021/04/Eggtimer-Quark-Manual-D3.pdf

 

[waltr]

Like the others posted, a 2S LiPo work well.

I have built and flown a number of Quarks and they work great for simple DD. and they fit into smaller rockets. Smallest I have built is into a BT50 (24mm ) tube coupler.
For thi I use two small single cell LiPo batteries wired in series.

What size BT do you need to stuff this into?

 

[Dad of Sapling]

I don't know why I was thinking it was a 4 volt battery. I guess it was the time change. Anyway I'm thinking of using an Estes Vapor which is a BT 60.it
Oops like I will have plenty of room.

 

[cerving]

You MUST use a 2S Lipo with the Quark. The output drivers won't work properly with anything under about 4.5V... just a tad too low for a 1S Lipo.