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I can't imagine very many pilgrims carrying a big, heavy power bank that's over the limit.Do check the watt hours of your power bank. The FAA permits power banks with 100 Watt hours or less without Airline approval and 100 to 160 watt hours (Wh) with Airline approval. My two Anker power banks are both rated at 37 Wh, and they are both 10000 mAh units. With Anker you actually have to download the manual to check the watt hours or look on the back of the unit, if you already have it.
Silvery lithium’s great strength is also its biggest weakness. It’s unstable. It explodes. A lithium-ion laptop battery holds as much energy as a hand grenade
Of course, can't mitigate against a poor battery, in that case a battery bank could make sense. But with airplane mode selected it cuts off all the apps. Just an option that works for me.This is very much a matter of the condition of your phone battery, as well as the apps used.
I used to use battery saver mode, but now what works for me is to turn off wifi and blue tooth and set the screen rotation to portrait mode only. My phone will usually last the day, unless I take a lot of photos or am just using it a lot. When it does need charging during the day, I like to have the power bank so I'm not stuck somewhere waiting for it charge up.Of course, can't mitigate against a poor battery, in that case a battery bank could make sense. But with airplane mode selected it cuts off all the apps. Just an option that works for me.