do i have a deffective battery?

[matt_90036]

hi, i got myself a new ipad last week. it seemed to be discharging quite fast so i decided to do a battery test.
here are my movie playback results:
- 5% battery loss after 20 minutes of movie playback with sound muted, 100% brightness.

do you guys think something is off? or do you guys also get the same drainage?

 

[iPadCharlie]

The batteries in the iPad have proven to be pretty reliable (so far!) and have been living up to the 10 hour (average) use time, but what has been known to be a little "flakey" at times is the battery usage indicator!

This is why Apple suggests letting your battery drain to the point where the iPad shuts off then recharging it to 100% to re-calibrate the battery usage indicator.

From the Apple website --

 

[Sonny Burnett]

How long does it take you to totally run it down to zero?

 

[iPadCharlie]

The correct answer is, "As long as it takes!" It all depends on how much battery you have left when you start the process. To intentionally run the battery down, I usually start one of my streaming audio apps (like PocketTunes). This does two things: It keeps the screen on and maintains constant WiFi activity - two things that use the most power (except for 3G, but I don't have that on my iPad).

 

[matt_90036]

ok i will run it down to zero and let you guys know.

 

[iPadCharlie]

You may need to set your Auto Lock in Settings to Never so your screen does not shut off.

 

[STi]

Damn...I didn't know this! I always top it off and rarely get below 30%...going to drain the sucker now with clock radio.

 

[matt_90036]

ok 7 hours into a movie playback and my batter is at 10%. i doubt that i will make 10 hours advertised by apple. do you guys think apple will still exchange this device for me. i bought it 10 days ago... i don't really have time to send it to service because i will be out of the country in few days.
UPDATE: ok 8 hours and the battery has 3% left with no volume. is this expected?

 

[gentlefury]

ok 7 hours into a movie playback and my batter is at 10%. i doubt that i will make 10 hours advertised by apple. do you guys think apple will still exchange this device for me. i bought it 10 days ago... i don't really have time to send it to service because i will be out of the country in few days.
UPDATE: ok 8 hours and the battery has 3% left with no volume. is this expected?

You must have the brightness CRANKED! I keep mine at the lowest brightness and get about 14-16 hours out of it. And thats listening to music, watching movies (netflix, air video) browsing, email, chat, etc.

When I'm working I use it all day while I work so I charge every 2 days...sometimes nightly depending on how long I can use it straight or how long im working.

When I'm not working I charge it once a week.

 

[matt_90036]

ok 7 hours into a movie playback and my batter is at 10%. i doubt that i will make 10 hours advertised by apple. do you guys think apple will still exchange this device for me. i bought it 10 days ago... i don't really have time to send it to service because i will be out of the country in few days.
UPDATE: ok 8 hours and the battery has 3% left with no volume. is this expected?

You must have the brightness CRANKED! I keep mine at the lowest brightness and get about 14-16 hours out of it. And thats listening to music, watching movies (netflix, air video) browsing, email, chat, etc.

When I'm working I use it all day while I work so I charge every 2 days...sometimes nightly depending on how long I can use it straight or how long im working.

When I'm not working I charge it once a week.

yes i do have brightness at 100%. but is apple's claim of 10 hour battery life on 100% brightness or something lower? am i just be paranoid here or do i have a battery problem (8hours video 100% brightness with muted volume). i want to be sure because i have 2 more days to return this thing.

 

[gentlefury]

ok 7 hours into a movie playback and my batter is at 10%. i doubt that i will make 10 hours advertised by apple. do you guys think apple will still exchange this device for me. i bought it 10 days ago... i don't really have time to send it to service because i will be out of the country in few days.
UPDATE: ok 8 hours and the battery has 3% left with no volume. is this expected?

You must have the brightness CRANKED! I keep mine at the lowest brightness and get about 14-16 hours out of it. And thats listening to music, watching movies (netflix, air video) browsing, email, chat, etc.

When I'm working I use it all day while I work so I charge every 2 days...sometimes nightly depending on how long I can use it straight or how long im working.

When I'm not working I charge it once a week.

yes i do have brightness at 100%. but is apple's claim of 10 hour battery life on 100% brightness or something lower? am i just be paranoid here or do i have a battery problem (8hours video 100% brightness with muted volume). i want to be sure because i have 2 more days to return this thing.

When most companies say 10 hr battery life they mean at the lowest possible usage settings. If you have the brightness at 100% it is your fault that its not lasting. There was NEVER a claim to last 10 hrs at 100% brightness. Why would you expect that to be possible. The fact that it lasted 8 hrs is EXTREMELY impressive considering how excessively bright it gets (almost blinding!) Now put the brightness at a comfortable level and try again.

 

[matt_90036]

http://arstechnica.com/apple/reviews/2010/04/ipad-review.ars/14
ok i read this review and they get ~6-9 hours at full brightness.
http://www.zdnet.com/blog/hardware/ipad-battery-appears-to-exceed-apple-estimates/7897

 

[Hasty]

Hmm reading this thread made me check my own brightness settings and I was surprised to find the slider at 65%. Just have a rough rule of thumb that 10% is an hour of battery life. Seems to work fine in practise regardless of the app.