Does Ultra Power Saving Mode chew up juice to turn on/off?

[paulri]

I was out all day yesterday and found my phone power level dropping to the single digits. I dug into the settings and started using the Ultra Power Saving Mode. However, we were at a theme park and I did want to take pics, so several times, I turned that mode off and then back on again after taking a few pics. I didn't notice that this extended the life of the charge at all, compared to the length of time it took to get to 9%.

Does turning this power saving mode on and off chew up juice, or was that a decent strategy to extend the useful life of the phone until i could charge it up again?

 

[KBU2]

I would think so considering that when you turn that option on it turns off a lot of apps with its data usage and when enabling it, it kicks all of those apps back into gear having them to restart all their function again.