A big enough powerbank

[papaof2]

Yes, this powerbank is big enough to charge ALL of your USB chargeable devices ;-)

From the specs: "almost charges the iPhone 12 Pro Max 4 times, the Galaxy S10 for 5.3 times or the Note 10 for 4.5 times or a tablet 2+ times"

So it can handle your GPS for several hundred miles or your USB fan overnight.

www.newegg.com/ace-cards-poker-rubberized-red-black-ravpower-rp-pb41-26800-mah-26800mah/p/39G-001N-000G1?Item=9SIAP08EWW1855

26800maH powerbank, 3 USB outputs (5.5 amps combined output)

$22.99 and free shipping until 13 June 22.

I have one on the way so I'll know more next week.

[papaof2]

The powerbank has 3 outputs: 5 volts at 2.4 amps, 5 volts at 2.1 amps, 5 volts at 1 amp.
The RavPower RP-PB41 is older technology as it charges via a micro-USB connector at a maximum rate of 2.1 amps. Since this is for when-needed backup, the long charging time (12+ hours from fully discharged) isn't a concern.

I think I mentioned the battery-powered fan/light I got from Amazon to have a convenient source of light and limited cooling for short summer power outages. That unit will run on the lowest settings with a charger connected - including the 26.8AH RavPower powerbank. That ups the time for the fan and light to both be on from 14 hours to about 48 hours. I can charge both from the backup power system or I can use the solar panel with a 5 volt, 2 amp USB output. I think that combination was a good investment - even more so with all the "weather related" outages the past few days ;-)