Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: how long does the battery last
Document: I have both the Fostex HP P1 and the combination ALO Continental/Cyperlab Algorhythm Solo. So I believe that I can compare both. The Fostex is an exceptionally well designed piece. It is good looking and relatively small. It is bigger than an Ipod, but will comfortably fit in a pocket with an Ipod. It is an all in one piece. As such, the battery is called upon to do a lot. The charge does not last very long.
You cannot run it through EQ.Battery: HP-P1 will provide a day of "normal" listening (5 to 8 hours), but will run dry long before a players.Amp: The amp will not drive high ohm headphones with authority.
purchase the hpp1 not too long ago. was looking for a portable headphone amp and performs really well with my b&w p5. i bought a sennheiser hd700 and will try it.
Most of the great portable headphone amplifiers last much longer on a single charge. This is especially true of the Ray Samuels Audio, Leckerton, TTVJ, and Headamp Pico portable amps. These other portable amps are fabulous and keep a charge a lot longer, but then are not DACs or Ipod transports.Considering that the Fostex HP-P1 is a great piece of equipment and at approximately $650.00, it is really a good buy! !
I have this feeling that one day I may accidentally hurt it because it sticks out too far. There was no need for it to be that long and therefore the weak link.SIX STARSUPDATE: I'm loving it still. So I purchased a Diamond sync cable from Audioquest, silver. There is also a Carbon, either way get a nice sync cable. This is the only amp/dac that is connected with a pure digital sync cable due to licensing and Apple proprietary tech.
ok let me preface this by saying this is day one with this device.i have tried other amps fiio 17 for one and this unit blows it away.i did not know my i pod could sound this good.after some experimenting i set the gain at 2 and filter at one.great clear honest sound sharp bass, clear highs and the vocals are crystal clear.i am running this through my westone 4 r s and my ue 900 iems. awesome sound with both.love it
What I have found is that the HP-P1 gives better performance the better your cans/monitors are; the increase in enjoyment using my ESW9 or DTX100 is low as compared to the cost for this increase, while I consider it money well-spent when paired with my ES5.I wouldn't call this a must-have for anyone considering it's clearly a luxury good. It depends on how much enjoyment you get out of your music and your priorities/cash-flow at the moment.
Using this with a new Ipod Classic and Ultrasone Edition 8 headphones; the sound is awesome. First time I can really hear longer decay of notes, better separation in a chorus, and more voices within the chorus. More separation and depth of bass. The construction is superb; the volume knob extending out is helpful with adjusting the volume from within a case; It trickle charges your IOS device, so you basically have to charge one item only, if you leave the ipod plugged in. Quality construction and performance!
This is awesome and unique. Only problem is the 1/8 inch plug. No 1/4..
This EASILY replaces my NuForce Icon headphone DAC which uses USB. The sound of the Fostex is amazing.The price seems high but as I start to realize how much I enjoy using it and the versatility, I am starting to forget about that part. It also comes with a well constructed case to hold your iPhone or iPod together with the Fostex but I found it to be a bit of a pain accessing the iPhone screen and playing with inputs.
Answer: Don't hold me to this , but maybe 5/6 hours depending on how much of a charge the playeryou're using it has left on it. The player will constantly draw from the Fostex if it is used inDAC /amp mode rather than just amp mode (the 30 pin to USB cable thinks it's seeing a charger even when the player/Fostex are both off. Just a trickle charge but it is constant. Unplug the cable when not in use (i let it dangle from the player; it's a short cable) & I try to give the iPod a short charge before I hook back-up.