You're bike will be creating more power than that USB charger can take in so don't worry about it draining your battery. I use a 2 port, 3.1 amp charger on my bike and have no problems with it. Almost every other non-phone USB charging device uses either 1 amp or 500 miliamps for charging. This combo charger is where you start getting different numbers for total due to the 2.1 to 2.4 standard.īased on the devices you listed as as needing to be charged, the only one that would benefit from a 2 amp port is the phone.

We won't focus on this type of charger.Ĭhargers, generally, show a rating based on total potential output of all the USB ports it has.Ī charger with a single USB port rated at 1 amp will be marketed as a 1 amp charger.Ī charger with 2 USB ports rated at 1 amp each will be marketed as a 2 amp charger.Ī charger with a single USB port rated at 2.1 amps will be marketed as a 2.1 amp charger.Ī charger with a 1 amp USB port and a secondary 2.1 amp USB port will be marketed as a 3+ amp charger. That tech is fairly new so they're far and few in between. Today, you've got devices that can pull in 3 amps for very fast charging. I'll refer to this below just as a 2.1 charge.

In the past couple years, 'fast'charging (everyone has a fancy name for it) was introduced which uses between a 2.1 to 2.4 amp charge. The standard for a long time now for modern phones was a 1 amp charge. Let's put some background on chargers to the forefront.

Usb 2 vs usb 3 current capacity