Charging the "multi night" battery for Transcend Mini CPAP

I will be "off the grid" for 8 days and I need to charge the "multi night" battery for Transcend Mini CPAP. Other than the solar charger, is there any other way to charge the battery when AC power is not an option? Could the following or something similar work?

RAVPower 26800mAh Portable Charger with 30W Type-C Port
Output 1* Type C output + 2* iSmart output
Input DC 5V/2A (Micro USB),DC 5V/3A,9V/2A,15V/2A,20V/1.5A (Type-C Input)

Solar will only work if the wather is consistently sunny.
You will need AC power.
Off the grid or a generator.
Most are too noisy to run at night.
Fellow campers will hurt you.

HikingKili wrote:I will be "off the grid" for 8 days and I need to charge the "multi night" battery for Transcend Mini CPAP. Other than the solar charger, is there any other way to charge the battery when AC power is not an option? Could the following or something similar work?

RAVPower 26800mAh Portable Charger with 30W Type-C Port
Output 1* Type C output + 2* iSmart output
Input DC 5V/2A (Micro USB),DC 5V/3A,9V/2A,15V/2A,20V/1.5A (Type-C Input)

There was a recent post where someone described running a Transcend directly from a lithium power pack
viewtopic.php?f=1&t=154627&p=1189398
This user has not reported back on his success.

I'm a bit skeptical that it only used 10% of a 100 Watt-hour battery, and the Sherpa is quite pricey, but it might be possible to make something like this work. Are you car-camping or hiking in?