How long does your MP4 player's battery last?
 

Mine doesn't look to last more than 5 hours. Much less if I watch videos...

about 10 hours

Re: How long does your MP4 player's battery last?
 

haven't really stopped the time yet..

but the fact-sheet on the ebay-site where i bought mine says 4-5 hrs video or 6-9 hrs audio.. also depending on volume, brightness of the display and bitrate of the songs of course

Bitrate affects battery usage?

Re: How long does your MP4 player's battery last?
 

Sure,

The more processing required, the more power is required.

This is why, when playing videos, battery is exhausted quicker. The processor (cpu) is now processing two streams, video + audio = more power drain.
My 2GB 1.8" nanoclone's li-poly battery battery will go apprx 6.5 hrs w/ mp3 s and 5 hrs w/ video, or until my eyes start to cross (:>) .

Your mileage may vary.

Iridium

What about WMAs? Do they require less or more processing compared to an equal quality MP3?

Re: How long does your MP4 player's battery last?
 

Mathematically speaking, yes, but difference should be so small, that you may not notice it over the course of a couple of songs. Only one way to tell.
Convert say, 50 mp3's over to wma, then time wma playing time vs. mp3's.

If there is a large difference, please post results

I'll try as soon as I find the time. Thanks for the information.

Years later, but i interest in this thread. My mp4 player battery usually last 5-6 hours. I know some info about making mp4 player battery last from the net, share here:
1. Set your players LCD set to 'Dark Mode' in the setup menu. Have it go to dark mode after 5 seconds (or 10 if you'd like). You DO NOT want to put it on gray mode, which is the default mode the player comes in. Because the screen is on constantly, this literally drains your battery away.. like a leech! With dark mode, the screen will shut off after the amount of seconds you specify.. but the player will still be on. Much like Ipods, eh?

2. FULLY charge your mp4 player battery. All of these players come with a charger. When the green light is on, that means it is charging. When the green light goes off, it is SUPPOSED to be done. But, it is not. For some reason, the charger won't charge the battery fully in one go.. and I don't think anyone knows that, because I haven't seen it posted before. But, after your green light goes off the first time, push any button on your player (just not the off button!) and you will see the green light go on again. It will then fully charge the rest of the way.

3. Do not leave the player in any abnormally hot or cold places. Leaving your player in the car on a hot summer day is a really bad thing to do, because there IS acid in those batteries, which could cause them to explode, if there are in a very hot or cold area. That is the worst-case scenario. Most of the time, the battery acid will leak and it will cause damage to the other components, making your player inoperable.

There are MP4 players using Nokia's battery. Not sure how long will last. I'm getting one and will post the result very soon. I'm in Indonesia. Those Chinese made Nokia battery is very cheap. The cheapest I can find is $1 a piece (US $).