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The new BCA Float E2 avalanche airbag packs use an Alpride E2 supercapacitor system to store energy that powers the compressor upon deployment. Supercapacitors store and release energy based on electromechanical properties rather than a chemical reaction like in rechargeable batteries. This makes supercapacitor performance much more reliable in cold temperatures. For the same reason, the energy stored in a supercapacitor releases faster when activated for deployment.
The slimmed-down Float E2 Airbag Pack has all of the same features as the 35L model, but 10 liters less volume, lower profile, and therfore no compression straps needed. Available in two sizes: SM/MD or MD/LG.
In addition to the supercapacitor storage, you can install two AA batteries to allow for additional deployment in the field. The batteries also help keep the supercapacitors at full charge when not in use.