Is Safari a Battery Killer?

The estimated battery life is :

Up to 10 hours of surfing the web on Wi-Fi, watching video, or listening to music

At 3% for 15 minutes that would give you 8 hours 20

2% per 15 minutes is 12 hours 30

3% in 15 minutes is 100% in 500 minutes, or eight hours and twenty minutes.

Apple specs:

Internet use: Up to 6 hours on 3G, up to 9 hours on Wi-Fi

Come back when you have a problem.

Hi...

Try deleting the history, cookies, and cache more often.

Tap Settings > Safari

Tap Clear History

Then tap Clear Cookies and Data

Restart your iPad.

Hold the power button until "slide to power off" appears. Slide to power off. After it is off, press the power button to turn it back on.

The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.

Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.

How to Calibrate Your Mac, iPhone, or iPad Battery

http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/

At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html

Also, if you have a 3rd generation iPad, look at

Apple: iPad Battery Nothing to Get Charged Up About

http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/

Apple Explains New iPad's Continued Charging Beyond 100% Battery Level

http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/

New iPad Takes Much Longer to Charge Than iPad 2

http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html

Apple Batteries - iPadhttp://www.apple.com/batteries/ipad.html

Extend iPad Battery Life (Look at pjl123 comment)

https://discussions.apple.com/thread/3921324?tstart=30

New iPad Slow to Recharge, Barely Charges During Use

http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html

Tips About Charging for New iPad 3

http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html

Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips

http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad

In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.

 Cheers, Tom 😉

I've tested this with an empty page, min. brightness (auto brightness off), 5.1.1 iPad 3 world GSM (purchased in Finland). In 15 minutes, not a single percent drop in battery charge. That is, it's NOT the Safari engine that (without running any JavaScript) is causing the problem.

The reason for this MUST be one of the following:

- your brightness is close to max. The iPad 3 is known to consume more power with maxed out brightness than prev. models.

- if that's not the case, the particular page you're currently on uses a nasty JavaScript with busy waiting or the like. If that's the case, and the URL isn't confidential, let me know so that I can run some serious analyses.

So many solutions for an iPhone performing well within its published specs.

The worst thing Apple ever did was to offer a percentage charge readout on the screen. So much paranoia. Has anybody ever challenged a car's fuel guage at an accuracy of one percent?

"The worst thing Apple ever did was to offer a percentage charge readout on the screen. So much paranoia. Has anybody ever challenged a car's fuel guage at an accuracy of one percent?"

Well, it's still very important in finding out how, say, a specific app taxes the CPU if you don't have, say, Xcode (with its Instruments: see http://www.iphonelife.com/blog/87/reliable-cpu-usage-measurements-idevices ) around or it doesn't report the CPU usage at all.

Then, by, say, running the given app for an hour (at minimum brightness and over Wi-Fi so that it's mostly the CPU usage that contributes to the power usage and not the backlight / 3G) and comparing, you can already get a somewhat reliable measurement of an app's CPU usage. These figures can also be directly compared to those of other apps.

For goodness sake, why? I have never felt compelled to test anything about the iPhone. It works within its given parameters, I charge it whenever convenient, without the aid of a stopwatch, and do not care at all about CPU usage of specific apps. I just use it and enjoy it. I'll fret about battery usage if and when affects my normal use of the phone, not when x percent is seen to last y minutes.

There can be VAST differences in the battery usage of some kinds of mostly multimedia apps (radio players, video players, voice recorders etc.) - typically ones that you use for sometimes even hours (as I do by playing back MPEG2 TS files on my iPad). Then, it's very good to know which of the available apps have the least CPU usage, particularly if noone has ever measured them.

1. Use iPad
2. When battery is low, charge iPad
3. Use iPad

Pretty ****** simple, really.

... and when you can't charge it because you're in an aeroplane / train / gym, far away from any kind of wall socket? Then the CPU usage and the consequent power consumption does matter. And, as I've pointed out above, if you don't have access to Instruments or other means of CPU usage measurement utilities, using the battery percentage still gives you a usable tool to measure the CPU usage.

In such circumstances I plug it imto an external battery. Usong a mobile really doesn't have to be complicated.

Well, using an external battery itself is a complication that could easily be avoided by knowing which apps to prefer to, say, play back MPEG-2 or WMV content - or even H.264 if one, for some reason, wants to prefer software playback (for example, for audio / video DSP functionality not available while using the hardware decoder: reverb, audio boosting, saturation / contrast / brightness change etc.).

There are vast differences in the CPU usage of software video (or, for that matter, audio) decoders. Just an example: ProPlayer and AVPlayerHD have the least CPU usage when playing low- or standard-res WMV1/2 content. All other players (including the, otherwise, great GoodPlayer) have at least twice the CPU usage.

Unless one finds reliable, already-made measurements of CPU usage on the Net and/or gains access to a developer Mac with Xcode + Instruments to quickly (1-2 minutes at most) measure the CPU usage, long-time (1+ hour) tests using the battery percentage meter is the easiest way to measure the CPU usage of an app.

"I was just browsing on a couple of travel agent websites, which one in particular was unresponsive at times, also tried with a different browser and it was pretty much the same results."

I've emphasized with bold the culprit: yes, it was the active JavaScript usage on that particular travel page that caused your CPU work hard and, consequently, chew thru the battery.