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Apple's iPhone 6S, iPhone 6S Plus in :90Apple (, Tech30) releases the latest version of its iOS mobile operating system on Wednesday. iOS 9 was first announced in June and features a number of new iPad multitasking tools, predictive features and some welcome under-the-hood performance improvements.

I've been using the beta for a couple months. Some of the best new features are trapped in the Apple ecosystem and don't work with third-party apps, at least not yet. Luckily, the stability and battery improvements make up for it.

Here are nine new things to try in iOS 9.

Leave the charger at home (but don't go far)

It's a big, bold claim: Apple says iOS 9 will give devices (even older ones) up to one hour more battery life. Apple has made system apps more energy efficient and implemented smaller tweaks, like not lighting up the screen for notifications when a phone is face down.

Additionally, a new Low Power option makes it possible to get another three hours of life. When your battery drops down to 20% and 10%, you're given the option to switch to Low Power mode. It pauses background processes, lowers the screen brightness, doesn't check for mail as often and goes to sleep faster. I quickly forget about the mode once I'm in it, except when nobody emails me and I wonder why.

If you really need more juice, you can also find the biggest offenders in the new battery settings screen, which lets you know what's draining power.

Hit the back button

This is by far the new feature I use most. Apple has added a back button to the top left hand corner of apps. For instance, if you open a link in Safari from Facebook, then hop to your calendar from an event notification, now you can follow the breadcrumbs back to the first app you opened.

Get to work

Apple really wants to make the iPad a serious work tool. iOS 9 adds a handful of powerful multitasking features to existing iPads (though many don't work on older models).

Slide Over lets you preview another app on the side of your screen. If you're reading a movie review in the new News app, now you can look up movie times in Safari simultaneously.

For full multitasking, Split View puts two apps side-by-side, which you can copy and paste between. It's a step closer to capturing the work capabilities of a PC, but it's not quite enough to win me over yet. As I write this, I have at least four different windows of notes, web pages and screenshots crammed into my 11-inch laptop screen.

Keep one eye on video

My favorite iPad addition is the screen-in-screen feature. If you're in a FaceTime call or watching a video on an Apple video app, tap the home button and the video will shrink into a smaller floating window. No matter what other apps you use, the video will continue playing.

Hopefully third-party apps will be able to tap this feature in the future so you can have Hulu or Netflix (, Tech30) playing while you work on an Excel spreadsheet.

ios 9 See if Apple gets you

One of the most hyped improvements to iOS 9 is also the most underwhelming.

The operating system is taking the time to get to know you - your habits, likes and locations - to predict what information you need before you ask. The "proactive" assistance features show up in a variety of apps, including Mail, where it suggests recipients. It's most visible in Siri and the new cluttered Search screen.

At the moment, the feature is a pale imitation of Google Now. At its best, it tells you when to leave for a meeting to beat traffic, but it doesn't have access to the breadth of information Google (, Apple has questionable taste in restaurants.)

Make Siri do new tricks

Siri now understands context. If you're looking at Halloween costumes in Safari, you can say, "Siri, remind me to buy this tonight, " and it will remember the web page. It only works in Apple apps like Mail, Safari and Messages.

The voice assistant can search photos and videos (in the Apple Photos app). Ask Siri to show you wine-tasting selfies from Napa last week, and she's got it covered.

Give Notes another chance

Apple's Notes has always been a utilitarian, bland built-in app. In iOS 9, it's trying to catch up to third party options like Evernote and OneNote. There are more formatting options and drawing and photo tools. If you're in another app, you can save links and images directly to a note. It's like making a Pinterest board that just lives in the Notes app.

Test out Apple Maps (but don't forget about the bus)

In iOS 9, it finally adds transit directions. Interestingly, I noticed that Google Maps and Apple Maps offer different routes and even departure times from my home to work - and that Apple ignores the bus closest to my house.

Proceed with caution, but less than usual

I always recommend waiting until Apple releases its first update before installing a new iOS on your device. It gives the company time to iron out any early bugs.

New versions of iOS are notorious for slowing down older devices. We don't know yet if iOS 9 will follow the same maddening pattern, but there are reasons to be optimistic. The size of the update is significantly smaller than usual. And the above mentioned battery improvements will be welcome on older devices with more limited power.

iOS 9 was also released as a public beta for the first time. In addition to the usual developers, regular people have been kicking iOS 9's tires for months now.

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