Regarding X5 2nd gen/X3 2nd gen/X1/X3/X5's charging behaviour

FiiO-Shadow

Q: Regarding X5 2nd gen/X3 2nd gen/X1/X3/X5's charging behaviour when connected to the computer

A: When the X5 2nd gen/X3 2nd gen/X1/X3/X5's are connected to the computer, whether as a DAC or as a storage device, power is supplied to the device as follows:
1. While the device is charging
Because the computer USB port has limited current capacity, the battery is given priority for part of the charging current while the rest powers the device directly.  But if the current draw by the device is high, the battery participates in powering the device as well.  Hence, both the battery and the USB port take part in powering the device while the device is charging.

2. After the battery is full
Because there is no need to charge the battery anymore, the USB port would power the device directly.  The battery would neither be charged nor discharged.

In summary of the above, the powering scheme of the X5 2nd gen/X3 2nd gen/X1/X3/X5's ensures that the battery may be fully charged while at the same time guaranteeing proper function of the device.  Finally, the battery will be at rest after it is fully charged, thus guaranteeing extended battery life.

pure.by

Big thanks for the information, FiiO-Shadow! However, I still have a couple questions.

What exactly does this sentence mean: "if the current draw by the device is high, the battery participates in powering the device as well"?
1) When is the draw by the device "high"?
2) Does it mean that device won't work properly as a DAC when battery is empty?
3) Does it mean that a charged battery may eventually die on me when listening to a lot of music on my laptop? (For the record, my music library is roughly 75% [CD FLAC], ~20% [MP3] and ~5% [24bit 44.1kHz FLAC]).

I'm asking because I want to purchase X3ii and use it primarily as DAC for my laptop, and secondarily as portable music player.
I need it to function as a stable DAC for my laptop and I don't want to worry about battery level when the thing is connected to my PC.

pure.by

Maybe a practical question to owners of X3ii, what is you general user experience? How does the device perform battery-wise in DAC mode on a daily basis?

goodyfresh

So does this mean that when operating as a USB DAC, the device is USB power-isolated?

Yellow

goodyfresh replied at 2015-8-9 02:43
So does this mean that when operating as a USB DAC, the device is USB power-isolated?

When it is set to DAC mode and connected to pc, the pc will still charge it.

W.Bryan

Hi Fiio

Question, I have interrupted my Fiio x1's charging by pulling the charger in the outlet although it is not finished charging yet, then I continued the charging of the unit in a different outlet but same charger and cable and the device say's fully charged, is it normal?

Thank you

Yellow

W.Bryan replied at 2015-11-5 13:19
Hi Fiio

Question, I have interrupted my Fiio x1's charging by pulling the charger in the outlet al ...

Hi, W.Bryan, would you pls let me know the output voltage of your outlet? If it is 5v, it is normal.

W.Bryan

Yellow replied at 2015-11-5 16:47
Hi, W.Bryan, would you pls let me know the output voltage of your outlet? If it is 5v, it is norma ...

This is my charger coming from my Xperia Z

Output: 5.0VDC=1500mA

Is it okay to use?

Yellow

W.Bryan replied at 2015-11-5 18:40
This is my charger coming from my Xperia Z

Output: 5.0VDC=1500mA

Yes, this is ok. They will work great together.

alphire

Is there a way how to force X3 to charge using the slowest setting, 500mA even on 2.1A output?

samandhi

alphire replied at 2015-11-6 15:05
Is there a way how to force X3 to charge using the slowest setting, 500mA even on 2.1A output?

  Nope. No way to limit it through the device except by using USB from PC. My laptop has the added ability (in just one of its USB ports) to change the amp output to that port. Typically the standard USB will output max 500 mA.

alphire

Just because something is not publicly announced doesn't mean it doesn't work
Maybe X3 is waiting for voltage drop on 5V rail and when it happens, it trigger 500mA charging current instead of 1.16A. Let's test it

samandhi

alphire replied at 2015-11-8 03:51
Just because something is not publicly announced doesn't mean it doesn't work
Maybe X3 is waiting ...

  Negatory. The device has no manual charging element to it. It will charge at whatever amperage it is fed (up to a max amount). There is no way through the settings or software (or hardware circuit) to make it charge at a specific rate. If you feed it more than 500 mA, it will charge at that rate. No regulator on the device itself.

  The only regulation circuitry in the device (related to our discussion) is overcurrent, and time of charge (and of course low voltage. It is a Lipo after all). If the device is on charge too long, and is not full, it will shut off the charging circuit so as not overcharge it.

W.Bryan

Hi Fiio

Can I accidentally overcharge Fiio x1? or the unit will automatically prevent it?

Thank you

samandhi

W.Bryan replied at 2015-11-9 14:01
Hi Fiio

Can I accidentally overcharge Fiio x1? or the unit will automatically prevent it?

  You cannot overcharge it. There is a cut-off that will shut off charging when it is at full charge, or a certain time limit has been reached; whichever comes first.

Yellow

W.Bryan replied at 2015-11-9 14:01
Hi Fiio

Can I accidentally overcharge Fiio x1? or the unit will automatically prevent it?

Hi, W.Bryan, you can't overcharge it. There is a circuit to protect the battery. If it is charged fully, that circuit will be activated.

ViolettaValery

Hi there

I own a x5 2nd Gen. Since i did the last firmware update yesterday, it isn´t recognized by my computers (MacBook Pro & iMac) anymore. It suddenly starts charging and the little "charging light" on the button changes blinking red and green very fast. But there are no sd-cards shown at my desktop anymore. And no matter how long i try to charge, it seems charging is never done. Do you have any idea what´s wrong with my x5?

Thank you!


P.S.: The day before the firmware update everything worked just fine

Yellow

ViolettaValery replied at 2015-11-23 00:47
Hi there

I own a x5 2nd Gen. Since i did the last firmware update yesterday, it isn´t recognized b ...

It seems wired. So did you have a reader to get the previous version to downgrade it to test? I guess it is hardware issue. You could consider the seller for a replacement.

optisailor2002

Hi, I have an x3 gen ii, and the past few times i have tried to charge it, it never seems to fully charge. I've tried different sources such as USB hub, iPhone wall charger, and after 4 hours on each the light still remains read. What should I do? Thanks!

Yellow

optisailor2002 replied at 2016-6-30 07:26
Hi, I have an x3 gen ii, and the past few times i have tried to charge it, it never seems to fully c ...

Hi, optisailor, so the led never turn to green? May i ask what is the output of your wall charger? Is it 5v/2A?