I would nuance 2/ and says it will charge fine with 15W hen not in use. In use, my battery will deplete with a weak charger, it won’t charge, because the laptop

I would nuance 2/ and says it will charge fine with 15W hen not in use. In use, my battery will deplete with a weak charger, it won’t charge, because the laptop consumes more than 15W when I use it – and that’s light usage.