Keeping a fleet of electronic devices going requires juice. Here's some devices we've found useful. 

Cheap cables can ruin micro USB ports or can create long charging times. These cables are some that we've found useful. 

Wall warts are such a pain, we've started using 5 and 8 port smart AC chargers. I also keep some 3 port ones for business trips. With the advent of Quick Charge, it's often cheaper to get a smart, fast charger than buy a wall wart from BestBuy or similar. 

With a fleet of vehicles we are also needing USB chargers and power supplies for GPS, etc. For our Sprinter van, my truck, and the pinzgauer I have hardwired chargers to keep the cigarette lighter port free. 

Cheap meters to measure charge performance are available and are quite handy.