Just about every modern computer peripheral device uses the USB port. Practically all smartphones, tablets, GPS navigation units and portable electronic toys with rechargeable batteries have chargers that use the USB cable to connect the device to a wall charger and to a computer. However, the USB port on a computer was never designed to charge a battery and any of today's portable devices that require charging power above 2.5 watts will not charge rapidly on a computer USB port. The Secrets Of USB Battery Charging will explain why your devices will not "Rapid" charge on your computer USB ports and most third party chargers and alternatives to work around the limitations of the USB port power specifications.
The latest edition of this book has added emphasis on using an iPad in the cockpit of aircraft and gives pilots valuable insight on keeping an iPad charged while on for long periods of time.
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About the Author
I'm a retired computer systems plumber. Spent 40+ years in software and hardware development. Also been a private pilot for all those years.