Bundaman1 just so you understand it okay, this does not mean that your device will keep rebooting every 10-30 minutes but will reboot once after 10-30 minutes of inactivity and will remain in BFU (before first unlock) mode. So if you don't unlock often, you should notice positive impact on your battery. Do not forget also that unless you unlock your device, you won't be receiving any notifications which may be a bit of a let down for you.