I have found a 1.1 amp charger would not charge the unit, and so I am using a 1.3 amp charger in a wall plug because the lower amps gives a deeper charge. I prefer not to leave it connected to a pc and only have it connected when syncing.
My recommendation is to use a high current charger from a branded company, and to stay away from cheap, or low power chargers. I use a 40W (8A) 5 outlet charger at my desk, which charges everything. My understanding is this:
A well built, high output current charger has a lot of reserve, and runs cool most of the time, and has plenty of margin in reserve. This way, it never gets pushed beyond it's capacity, where it will overheat, and potentially break down, outputting damaging voltages/noise as components fry.
Using a small low power charger is a bad way to limit current.
- the device (phone, pad, dap, etc.) internal charge circuit decides whether it needs more current (if very low charge level) or less current if almost full. Get a cheap USB test circuit, which goes in between the cable and charger, and shows the voltage and current, and you can see the different current requirements that any device has when almost empty, versus when almost full.
- If the device is trying to pull 1-2 amps, and the cheap/small charger is only able to put out .8 amps clean, the charger will go into overload trying to provide the current asked of it. Typically, it will overheat, and break down, which YOU DO NOT WANT TO HAPPEN. The worse is a cheap charger that uses cheap components, overstates it's output current, and has unknown/bad quality...a disaster waiting to happen.
- when a charger states 1 amp output(almost always overstated), it does not cut off at 1 amp. It will typically try to deliver more, if the device is trying to pull more, and will be driven into overload.
- A hefty, high current charger, on the other hand, is idling providing 1-2 amps on multiple ports, and just gets warm. It has so much capacity that it is running way below its design limits.
In my opinion, using small, low current chargers is a very bad idea.