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The battery life that devices promise can vary considerably from the battery life they actually deliver, and because of this, it is always a good idea to carry with you some extra juice in the form of an external battery pack.
Carry a whopping 12,000mAh of power – enough to recharge an iPhone six times according to the manufacturer – in your pocket with the Anker Astro3 (CNET battery comparison). This battery pack doesn't have any buttons, and all you need to do to start it charging or to check the power levels is to give it a shake.
One of the biggest productivity boosters you can add to any post-PC device is a keyboard. While on-screen keyboards are great for tapping out a tweet or email, they just aren't up to the challenge of typing out reams of material.
Add a keyboard and your smartphone or tablet becomes a true content creation machine!
My personal favorite keyboard for iDevices is the Apple Wireless keyboard. (CNET best keyboards). It's expensive, but it's reasonably slim for easy transportation, very ergonomic, tough (unusual for an Apple product), and very comfortable to type on for long periods.
Price: Depends on what you go for.
If you spend a lot of time in your car -- like I do -- you need a way to keep your portable devices charged up while you're on the move. While chargers for smartphones such as the iPhone are plentiful, good chargers that output the 2.1A needed by tablets such as the iPad are harder to find.
Currently I'm using a dual USB-port Just Mobile Highway Pro that keeps my iPhone and iPad charged up. It's a little pricey at around $30, but it's one of the most reliable charger I've come across so far – and I should know because I've bought a lot over the years.
Price: Around $30.
(Source: Just Mobile)