[General Questions and Answers] zasy99:
E7ite: You should be fine, the fact that it charges via USB means that it must have its own internal charging circuitry.

I bet your Xperia tablet also charges via a USB type cable right, on a USB port?

All my USB 'chargers' have different mA rating yet they charge my products just fine as long as the mA rating is at LEAST what the device needs, not less, and hey, if its a little less it also works, just takes longer.

Look at it this way, the USB specs are always changing as is their current handling capability, now we are at USB 3.1, just recently we were at USB 3.0 which bumped up maximum device current usage during data transmission to 900mA or for dedicated charging 1.5A.

For USB 1.x - 2.0 it was 100mA before negotiation, up to 500mA thereafter, also with a dedicated charging capacity of 1.5A if the D- & D+ pins are shorted.

I bet Sony doesn't tell you that you can only charge via a USB 1.x - 2.0 port do they? Nope, that means if your computer has a USB 3 port that its has the potential to deliver more, remember, that's the key, it CAN deliver more if needed but it won't, it will only give the device what it draws.

The cable they supply with your headphone is most likely not a data cable but rather a so called charging cable so therefore is rated up to 1.5A or 1500mA but your headphones will only draw what they need to charge.

Everyone uses the term charger which is so wrong, when you put your AA or AAA batteries into the little black box and plug it into a wall, that is a charger, when you connect your car battery via the +/- terminals and clamps to the charger, that is also a real charger, they are directly responsible for charging the batteries.

All these other things we use to 'charge' our little electronic devices do nothing other than take the 120V A/C and convert it into for example 5V DC. The current rating they indicate next to the 5V is simply the max current handling capability, nothing more, it not what is pushed to the device, its what the device can request up to to be delivered. The actual charging goes on inside the device.

By the way, as the batteries charge the device reduces the current and sometimes also the voltage, batteries typically charge faster when they are low and able to absorb more current then as they fill up and can absorb less the charger adjusts to a more or less trickle such as 100mA or less in order to maintain but not overcharge the battery.

By the way, this is what I found on Amazon in about 2 minutes, a review from someone else who bought the headphones.

"For the price, sony should have included a wall charger. Instead they included a USB cable. The headphones will charge on any computer, but using a generic USB wall charger will show a blinking amber error light--but the headphones still charge."

Also, the link you indicated to the sony manual about charging gives absolutely no information at all.

You are over thinking it, just try it ;)

If you are really worried why not get a regular cell phone USB charger and use that, one that states like 500mA on it and has a female USB plug on it. That way you can use your headphone USB cable and plug it into the 5V 500mA phone 'charger'.

One last thing, just don't use Apple product 'chargers' to charge non Apple products, why you ask, because Apple does strange things with the pins on their 'chargers' in order to indicate the supply current. This can sometimes lead to adverse effects for non Apple devices.

Good luck.