[snellemin]

It's true that you don't want to leave lithium batteries at max pressure(4.2V) for a long time.  For a better life cycle, just don't go below 20% capacity and max around 4.1V.  This is what I do with my Ebikes.
 
But if you think about it, by 200 battery cycles there will be a newer and better E15.
 
 
There is a hardware solution for those that are curious in what their battery capacity is over time. Here is one device that will work.  There are cheaper usb power measuring tools too.
 
http://www.amazon.com/dp/B00LZ07BG0/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2INAHOED2PV8&coliid=ID7QFD04HIM6Y&psc=1
 

 

[StanD]

If anyone is worried they should email of PM FiiO and ask it hey charge the battery to 100% or a little less to preserve battery life.
Hey, James are you watching?

 

[x RELIC x]

Honestly, I don't feel that normal use as intended will be an issue and regular charging will be fine. I just pointed out that keeping the unit ALWAYS on the charger CONSTANTLY is bad and very stressful for the battery, like all lithium batteries. Like simply revving your car engine to max rpm constantly. You will wear it out quicker. Read the links I posted earlier if anyone is interested, but I feel this has gone way off topic and my apologies for starting it all.

 

[Chris J]

Honestly, I don't feel that normal use as intended will be an issue and regular charging will be fine. I just pointed out that keeping the unit ALWAYS on the charger CONSTANTLY is bad and very stressful for the battery, like all lithium batteries. Like simply revving your car engine to max rpm constantly. You will wear it out quicker. Read the links I posted earlier if anyone is interested, but I feel this has gone way off topic and my apologies for starting it all.

That basically sums it up.
Case closed.

 

[bzippy]

That basically sums it up.
Case closed.

i agree. so let's talk about that E15 i say (or E13 or whatever). what's next from FiiO vis-a-vis high power portable amp i wonder?

 

[Dobrescu George]

 
i agree. so let's talk about that E15 i say (or E13 or whatever). what's next from FiiO vis-a-vis high power portable amp i wonder?

e12 is able to power hd800. maybe not at the fullest of levels, but it is able to do it. for what would you need eve more power?

 

[bzippy]

  e12 is able to power hd800. maybe not at the fullest of levels, but it is able to do it. for what would you need eve more power?

oh, not more power. just something new & fun for when my  E12 battery dies.

 

[Dobrescu George]

 
oh, not more power. just something new & fun for when my  E12 battery dies.

ah, got it!
 
i wish fiio would release an amp that has the power of e12 using muses op-amps!

 

[StanD]

 
oh, not more power. just something new & fun for when my  E12 battery dies.

Powerd by cold fusion. No more stink'in batteries and wallwarts.

 

[Chris J]

Powerd by cold fusion. No more stink'in batteries and wallwarts.

Cut back on the medicinal marijuana....:confused_face_2:

 

[StanD]

Cut back on the medicinal marijuana....

I'm not out west, here it's criminal
You were probably one those guys that laughed at the Wright brothers.  

 

[Chris J]

I'm not out west, here it's criminal
You were probably one those guys that laughed at the Wright brothers.  :veryevil:

I did laugh, but I was laughing WITH them!

 

[StanD]

  I'm not out west, here it's criminal
You were probably one those guys that laughed at the Wright brothers.  

 
 

I did laugh, but I was laughing WITH them!

That's what they all say.
You were probably laughing at Thomas Edison singing "Mary had a little lamb" into a wax cylinder. In this case I might have joined in laughing.

 

[DeadMan]

Why is there no desktop equivalent (so I can plug into USB) without any annoying noise? I want the crosstalk/bass boost features etc and a balanced volume control with no noise whilst being powered. I don't need any battery nonsense.

 

[x RELIC x]

Why is there no desktop equivalent (so I can plug into USB) without any annoying noise? I want the crosstalk/bass boost features etc and a balanced volume control with no noise whilst being powered. I don't need any battery nonsense.

Um, because they didn't make one.

They have an e90k for desktop that uses the original e17 and e07k as a DAC but no crossfeed. About the same power output with USB.

http://m.fiio.net/en/products/8