OpenVPN on the other hand, keeps open connection for the entire duration of the session. It is pretty reliable way to kill your battery. I'm using Strongswan c

OpenVPN on the other hand, keeps open connection for the entire duration of the session. It is pretty reliable way to kill your battery. I'm using Strongswan client, it is IPSec just like the built in client, but more capable, including cert based authentication and MOBIKE.