Amp3 Pro2 and the STUDIO - Page 32

I've gotten a little past 100 hrs on my Pro 2 with volume of 25+

How long did you charge it for, and did you use the charger or via usb?

You may have a bad unit if you're not getting proper battery life...are you using FLAC/WAV only?

I never ran the battery out completely using either my Pro.1 or Pro.2. My Pro.2 runs for two full days of use (somewhere in the 16 - 30 hours range, depending on the days), and the battery graphic goes from a full 4 bars to 3 bars (once it changed to 2 bars just before I switched it off for recharge). I recharge it every couple of days of use, and I notice no degradation in its performance in the charge range from a full 4 bars down to 3 (or just barely 2) bars. Since I find that the use duration from a battery charge is comfortably sufficient for my use, I've never wanted to actually measure the full-to-failure use duration from a single battery charge. I agree with you that it's not bad for the AMP2-Pro.2 (and for the Pro.1 as well).

As an aside:
With several other portable amps where X hours of operation per charge is stated (with specified phones at a specified volume setting), I have run this experiment under the specified conditions, and I consistently get about half the number of hours of use stated by the manufacturer before the unit goes into unlistenable distortion or output stops altogether for lack of available power. I run the battery life test (when I run it) after I have put the battery through about a dozen or so use/recharge cycles. There was one portable amp manufacturer for whose amps I actually measured the useful battery life per charge stated by the manufacturer: Norm Dalgarno (proprietor of Headsave DIY headphone amps, and original inventor and vendor of the Go-Vibe series of headphone amps). With Norm's portable amps, I generally measured about 50% more useful life from a battery charge than Norm estimated they would get. I miss Norm.

I think from the above comments that my unit must have a faulty battery as it certainly doesn't last 100hrs. I am using flac and mp3 files. It was fully charged yesterday morning and after 25 hrs it is now showing empty.

Mine is generally down to one bar after around 40 hours of leaving on without playing anything. I haven't done any controlled test though. Seems that a fairly large number of us are not getting anywhere close to 100.

Not that that surprises me or anything. As sbulack says these numbers are often exaggerated. I do not feel my amp3 battery is lacking. I hook it up to charge every night anyway as a compulsive habit.

USB, and I only play 192kbps MP3's.

GREAT

I use the wall charger and when the light goes out.... it is fully charged.

Same here.

Keep in mind that Hisoundaudio specifies the 100 hour play time at a volume setting of about 7. I doubt that many listen at that low setting, and higher volumes will naturally lower the battery life as will random play mode.

I listen to my ES3X/Mage/JH10X3/UE11 at volume 4

I can't use the wall charger, cause they sent me the plug that they use in Asia...=(