Does anyone have experience using the 61 watt charger originally intended for the 13" MBP with a 15" Touch Bar MBP? I use the 87w adapter at home but am looking for something lighter to take with me during travel. I know the 61w model may not be able to keep up when the 15" TBMBP is under full load and will generally charge the computer at a slower rate. I am accepting of this. What I am more concerned with is if use of the 61w will damage the computer's internal battery or overheat the charger. I'm also unsure of the amperage rating on these chargers.