Battery Life

With 39 hours to test I was pretty limited in what I could do when it came to battery life testing. I was able to run through two tests (one run a piece) and only in one configuration each. I wanted to see how Tegra 3 and the Prime fared in the worst case scenario so I picked the Normal power profile. Over the coming days I'll look at battery life in the other two profiles as well, not to mention run through more iterations of our test suite.

My bigger concern has to do with the malfunctioning WiFi in my review unit. For our video playback battery life test WiFi was on but not actively being used, those numbers should be ok. It's our general use test that loads web pages and downloads emails over WiFi and it's there that I believe things could've suffered a bit.

In both cases I saw around 9 hours of continuous battery life out of the Transformer Prime, without its dock. These numbers are a bit lower than the original Transformer but it's unclear to me how much of this is due to the additional cores/frequency or the misbehaving WiFi. The fact that we're within striking range of the original Transformer with the Prime running in Normal mode tells me that it's possible to actually exceed the Transformer's battery life with the Balanced or Power Saver profiles. That's very impressive for an SoC built on the same manufacturing process as its predecessor but with twice the CPU cores and a beefier GPU.

Video Playback - H.264 720p Base Profile (No B-Frames)

General Usage - Web Browsing, Email & Music Playback

What I'm not seeing however is the impressive gains in battery life NVIDIA promised its companion core would deliver. I'm not saying that the companion core doesn't deliver a tangible improvement in battery life, I'm just saying that I need more time to know for sure.

That the Transformer Prime can deliver roughly the same battery life as its predecessor without any power profile tweaking may be good enough for many users. Both ASUS and NVIDIA shared their own numbers which peg the Prime's battery life in the 10 - 13 hour range. As I mentioned before, I'll have more data in the coming days.

Update - With a replacement Transformer Prime in house, battery life is looking a lot better already:

Update 2: Even more battery life results in our follow-up

Camera Quality The Dock & Keyboard
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  • MiSoFine - Thursday, December 1, 2011 - link

    I had a TF 101 & used a cheap USB mouse & worked just fine--better than the touch pad in some instances; with my wireless printer I was able to print documents with ease. Didn't try the game pad--don't game. Might borrow an XBox to test with my preordered TF 201.
  • Sanz84 - Thursday, December 1, 2011 - link

    Android natively supports flash disks, usb external drives or devices and game controllers such xbox or ps3 wireless controllers - no need for third party apps. For the galaxy s2 you just need a cheap micro usb - female usb connector for example
  • Sanz84 - Thursday, December 1, 2011 - link

    Great job with the review. However, I'd like to point out how many people are losing perception of what a portable computing device should be for, especially for the masses. On too many sites (not here ofc) I saw reviews like: not unleashing all the power like iOS does; such phrases start to become embarassing and I'll explain why. Sorry if I'm derailing a bit, still will describe the Asus Prime even if not mentioning it.

    Common users take such devices - mostly- for web browsing, video viewing, music listening, connectivity and file management.

    Granted, I'd like to know in which of any of these fields is iOS such a beast.

    Web browsing - performance wise is quite good, ics browser showed up superiority anyway; incomplete experience without flash: no video streams from many sites, incomplete facebook feeling without addons, no 1080p youtube (correct me if I'm wrong)

    Video viewing: native player does not support popular containers such .mkv, paid apps not so smooth on 1080p? Video upload only via itunes, need to have fun with video converting.

    Music listening: converts audio library to m4a format, hard times if you want to add a single song from a different terminal

    Connectivity: no bluetooth file transfer, no wifi transfer outside itunes (on android can browse the device with w7 explorer), no usb, no sd.

    File management: guess.

    This said, why would an adult individual prefer an iOs tablet over the Prime? Why many reviewers take as normal the lack of file management and connectivity? If the iPad goes insane, you still need another device to recover it. It's not indipendent, but the Prime on its way, it is.

    The Prime with ics will be a big step forward into mobile computing and will be completed when win8 and x86 will be in game aswell. For me the iPad is a toy with a drawn apple that is great in mobile gaming. (can use external controllers tough?)

    Sorry for the wall of text and correct if I'm wrong :)
  • Icehawk - Thursday, December 1, 2011 - link

    As an iPad owner and daily user who is a dedicated PC owner, gamer, and a prior IT admin for 10yrs, here is my reply:

    First it all comes down to usage IMO. I have an iPhone & PC, and aTV too. What I find myself using the iPad for is the following: gaming, reading books, and acting as a go-between for my PC share and my aTV/stereo. When I'm in the living room and we want to fact check, IMDB, etc I find myself reaching for my phone if it is closer because on neither do I want to do more than a quick look - I do not find either enjoyable mediums for "real" browsing. I like to play so-called casual games while I'm listening to podcasts, radio shows, audiobooks and the like and the iPad is great for that IMO. I have a large, diverse library - I use Airplay and apps like Airvideo to bridge the gaps between devices in my home and find it pretty simple. What I don't do is any real work, any browsing of multiple pages/any length, and obviously more in-depth games like Skyrim need to be played on an actual computer. Oddly I have been using my iPad to do video editing even though it's probably easier on my PC.

    Regarding your specific points:

    Web Browsing - I use this exclusively for a quick browse - usually looking something up on iMDB, checking a TV schedule, etc so Flash isn't usally an issue unless, for example, a restaurant uses a Flash splashpage. Keep in mind I watch little online content in Flash format in any event so YMMV. Do I agree with Apple, no, but for me it isn't a deal breaker by any means.

    1080p, yup none of that but it's not a huge deal honestly - yes, I'd like it but you can't have everything and visual quality is good enough I can give up a little here. Maybe next time.

    Music - I don't have any m4a files mine is all MP3 and that isn't an issue. Yes, you do have to use iTunes and it still sucks monkey testicles and that in my mind is the real problem with any iDevice. iTunes pretty much chokes on my 200gb of music. The reality is though that I can either stream music from Spotify, et al or from my PC share most of the time, for trips away I can suffer through loading music on it or my phone.

    Connectivity - I can't disagree although it really isn't a huge deal for the most part. A lot of apps support file transfers btw seperate from iTunes or via iTunes without a sync. You do get AirPlay which works awesome most of the time and allows video & audio streaming. Regarding file transfer see my next comment.

    File System - ok, w/o a jailbreak you are fairly limited no doubt. If you DO JB, and you will if there is one available, you can install one simple file and then use a million different programs to browse the file system and even transfer files. I do wish iOS supported pure drag & drop though, trust me!

    Basically the things a lot of non-tablet owners think are an issue are not because it just doesn't fit the way you end up using them. IMO, YMMV, etc but this has been my experience ever since I got the iPad on release day. Where I find it to be the best damned thing I've owned is on flights - toss a few movies, ebooks, etc on there and I'm a happier camper.
  • Icehawk - Thursday, December 1, 2011 - link

    One more thing - you said if the iPad goes insane you need another device to fix it. I don't know about Android but one thing I LOVE about iOS is that it is virtually impossible to brick them. Plug them into a PC/Mac and there is always a way to restore it.
  • metafor - Thursday, December 1, 2011 - link

    True but having had an iPhone for 3 years and having to restore from backup a few times, it's ultra-annoying to lose everything that happened between your last backup.

    I don't know that it's really possible to "brick" an Android device to the point where you need to restore from backup. I suspect this is just Apple being more conservative with the internal state of their device.
  • steven75 - Saturday, December 3, 2011 - link

    With iCloud, backups are wireless on wifi and happen automatically every couple days. How much can you really lose in that time considering many apps themselves now backup to iCloud on their own?
  • Sanz84 - Friday, December 2, 2011 - link

    On android you can backup your data let's say on an external sd or usb flash disk and restore factory settings on the go (reinstalls the os basically). No need to plug the device to the pc. My iphone went nuts at least two times and couldn't call until I recovered it via itunes. On my sgs2 just restored factory defaults in few minutes and I was able to call.
  • steven75 - Saturday, December 3, 2011 - link

    That's no longer the case on iOS 5.
  • vvk - Thursday, December 1, 2011 - link

    iOS works seems to work better for none techie people. My parents are happy with their Ipad 2 (there was nothing better in May 2011 but my grandma is getting Android tablet for X-mas :)
    I personally feel like I am wearing straitjacket whenever I have to use iOS and the game of cat and mouse with the jailbreak gets tiring at some point. However, where I find restraints other people find support - humans are strange :)

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