21700 Lion pack by Cosmic Power Co. 4200mAh Li-Ion Battery (Choose 4S or 6S)

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  • Regular price $45.70

These are hand made Lion packs by an avid member of the community that tracks Lion tech. Each pack is literally hand tested and custom made by a skilled and experienced operator. These packs do NOT come from a random factory with random factory workers.

If you're unaware of Lion packs, they provide a drastic increase in battery capacity for any given weight. The issue is that Lion tech generally is not known for high discharge rates. We will not be providing education on how to use these packs. If you are buying this, you are expected to understand how to use it and know what you are doing.

6S pack weight: ~419g +/- ~6g
Dimensions: 65x75x45mm +/- ~5mm

4S pack weight: 287g +/- ~6g
Dimensions: 45x45x75mm +/- ~5mm

Made by Scott Weeks at Cosmic Power Co.


Cell specs (not pack spec):

  • Brand battery: Molicel
  • Model: INR-21700-P42A
  • Style: Flat Top
  • Nominal Capacity: 4200mAh
  • Continuous Discharge Rating: 45A
  • Nominal Voltage: 3.6v
  • Protected: No
  • Approximate Dimensions: 21.40mm x 70.00mm
  • Approximate Weight: 67.8g

Customer Reviews

Based on 2 reviews
Nathan Goldsmith (Las Vegas, US)
Go to for long range with freestyle power

You can rip on 7 inch with these cells. This is a great price since building this yourself will only save a few dollars after you buy shrink wrap, balance leads and cell holders.

David Boone (Surrey, CA)
Great battery for long range

Ordered Thursday night, arrived on Monday in Canuckistan, tested a couple hours later, so far so good! I usually use a 2200mAh 6S LiPo on my 7" quadcopter, so this battery offers almost twice the capacity for only a 50g penalty. First flight lasted over 14 minutes and covered 15.9km, including a bunch of full-throttle tests as I familiarized myself with LiIon power delivery, not bad at all!