Well you do run out of power all the time, then here are some good choices:
- MacBook Magsafe and special tip. This is the only system that I found where you have a plug in and it works directly to charge a MacBook Pro MagSafe (pre 2016). Also this system uses a five pin adapter, so it also works at lower power for USB C (but the one below is better).
- USB C 30 watt power delivery. This is perfect to rapidly charge or keep charged a MacBook Pro 2016. Most USB C chargers are limited to 10-15 watts, but this one does 15 volts at 2 amps. Way faster
- 12V and 19V for Windows laptops. It is expensive at $200, but comes with a whole host of tips and is great for the oddball Dell and other machines with their custom tips.