USB power delivery seems interesting to me. In this video I use a PD trigger to test some power supplies with some impressive results.

Items used in this video:
❗These links are affiliated and I may earn a small commission if you purchase❗
USBC PD Trigger: https://ebay.to/2PMvB6U
Qualcomm Quick Charge Trigger: https://ebay.to/2yTyrQD
Vici VC99 Multimeter: https://ebay.to/2HkW1cB
ZKETECH EBCA05+: https://ebay.to/2S2vmq6
Anker USBC Cable: https://amzn.to/2CnMQHP
OKZU USBC 10,000mAh Powerbank: https://amzn.to/2PIIOhn
Ravpower USBC Car Adapter: https://amzn.to/2ClzZG6