The Alpride E1 airbag system works with so-called "supercapacitors", which store the energy required to inflate the airbag. This type of energy storage is less sensitive to cold and has the advantage that it does not cause any problems when travelling by air. (These same problems often occur with the usual lithium-ion batteries and cartridges).
In the event of triggering - which is passed on to the batteries according to the mechanical principle - the supercapacitors are able to release a high level of energy to the fan within a very short time. This draws in ambient air in addition to the air conveyed by the fan. This creates an air suction that results in higher pressure and faster achievement of the airbag's maximum volume. The stored energy of the supercapacitors is (theoretically) sufficient for 2 to 3 complete inflations of the airbag, but it is recommended to charge them after each deployment. They can be charged either via a micro-USB connection or via a small compartment that can be fitted with two AA batteries. The former takes approx. 20 minutes, charging via batteries takes approx. 40 minutes to an hour.
A major advantage of the system is the ability to carry out test deployments without any fuss or expense so that you can act effectively in an emergency. If the airbag is deployed, the air can be released from the blower, the airbag is folded into the compartment, the supercapacitors are charged - and you are ready for another (test) deployment.