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Open VPN Connect is non open source client that is developed by Open VPN Technologies, Inc.
The client is indented to be general use client and more targeted at the average user and allows the import of Open VPN profiles.
Open VPN for Android is an open source client and developed by Arne Schwabe.
While these packets are small and do not use much traffic, they keep the mobile radio network busy and increase the energy consumption.
(See also The Radio State Machine | Android Developers) This keepalive setting cannot be changed on the client.
On many Samsung 5.x devices the allowed/disallowed apps feature does not work.
On Samsung 6.x VPN is reported not to work unless the VPN app is exempted from Powersave features.
In my personal tests the main reason for high battery consumption of Open VPN are the keepalive packets.