ROMOSS 30,000mAh Power Bank

I took this to a camping music festival and yes it was hot as it can be. I brought all my arsenal of battery banks. An old one from 2021, another from 2022, and 2 other small ones. Only the 2022 one has been toast and dies at like 50%. I saw the reviews for this one and was excited to have it around since it was massive and heavy so I assumed it would be a huge power brick. First off it arrived at 75% and with USB-C (later tried the Lightning feature), it took quite a long time for it to charge to 100%. Like 5 hours. First small negative thing about to but not a deal breaker. I took it to the camping festival and this is when I began to dislike it. I noticed it was discharging a little fast, and then I used it to power a fan and the fan would turn off. Smaller, crappier, power banks kept this fan on at full power. Finally after 60% it died. Nothing. I don’t know if it couldn’t handle the heat or something else but it was completly discharged. Meanwhile my 2021 power bank still had 50% in it and ended up using that to power the fan for the rest of the weekend lol. Hugely disappointed, had to return, and I’d say get a different brand.