Hello. My XPS 13 9380 has a few different charging modes. Standard should charge the battery a bit slower with a "standard" frequency and without ExpressCharge according to Dell Power Manager. Adaptive on the other hand is a "set and forget" option which is supposed to adjust automatically the charge rate. 

What I usually do is: charge the laptop until 100%, disconnect it, use it until 20% or so and charge it again. I never use it while charging and I don't charge it unless it hits 20%. Which charging mode would you suggest? I'm currently using "Standard" because I don't need ExpressCharge. 

Thank you.