Hi, I'm trying to find a charging bank that could recharge my phone a few times. Also, I'd prefer it to not weigh 20lbs but I do recognize these things arent light. Anyway, my big issue is that I have a Galaxy S20 Ultra. It has a 5000mAh battery and apparently prefers 15W charging output (more applicable in wireless situations as it just stops charging otherwise). I'm not great with this kind of stuff. All I know is the Powertraveller Harrier I purchased didn't even fully charge my phone once. Please help.