Takeaway: The HTC ThunderBolt may be breaking land speed records with its 4G LTE connection, but all that speed seriously drains the battery. Here are practical tips for squeezing out more battery life.

As I mentioned in my review of the HTC ThunderBolt, the ThunderBolt is a top-notch device that breaks through the speed barriers of the traditional smartphone. However, the ThunderBolt also has one big caveat: Battery life. This is a foible that many Android devices suffer from, particularly HTC devices. The HTC EVO and HTC Incredible are both excellent smartphones that struggle to get through an entire business day on a single charge.

For the ThunderBolt, the primary issue is when it’s in 4G LTE mode. That’s when it really screams — in terms of speed — but it’s also when the battery can completely drain in as little as four hours with heavy use. In order to help ThunderBolt users get the most out of this otherwise useful device, I’ve put together some power tips for squeezing extra battery life out of the ThunderBolt. While these tips are aimed primarily at the ThunderBolt and reference HTC-specific widgets and settings, they can also be applied more generally to almost any Android device (and specifically other HTC devices), with just a few adjustments.
I should also note that when the ThunderBolt is not in 4G mode, its battery life is actually very respectable. Using the tips in this article, I was able to get through a full day of normal use with the HTC ThunderBolt on a combination of 3G and Wi-Fi and still had 70% of the battery left after 10 hours. On 4G, I was able to use these tips to stretch the ThunderBolt battery to almost eight hours.

1. Tweak the display
If you want to see what’s draining most of your power, go to Home screen | Menu button | Settings | About phone | Battery | Battery use. You’ll see a screen like the one below. In most cases (except for when you’re on 4G), the display will be at the top of the list because the display is the primary power drain on nearly all smartphones.
There are several things you can do to reduce the display’s hit on your battery. Go to Menu | Settings | Display and adjust the following settings:
•    Turn off auto-brightness: Uncheck the box for “Automatic brightness” and drop the slider down to about a third. The ThunderBolt screen is still bright and clear, even at this setting.
•    Decrease screen timeout: The default is 1 minute. Drop it down to 30 seconds.

2. Throttle sync settings
Once you get your display settings under control, another quick thing you can do that will immediately make a big impact on your battery life is to get your sync settings under control. When you install and use various apps and widgets, they often set themselves up to automatically sync without warning you or allowing you to set up the sync settings such as how often to update. As a result, most Android devices end up with a bunch of things running in the background updating themselves constantly, which drains battery life and quietly eats away at your mobile data allotment on 3G/4G.
To see which of your apps and widgets are doing stealth syncs in the background, go to Menu | Settings | Accounts & sync. I prefer to uncheck the “Auto-sync” box and simply disable background syncing altogether (especially when I’m trying to ring out every last drop of battery life). You can always compensate by using HTC’s “Sync all” widget so that when you unlock your phone you can just tap the Sync all button and all of your data for all of your approved apps and widgets get synced (on 4G it will sync really fast anyway). If you want to take it a step further, in the Accounts & sync screen, uncheck the “Background data” box so that no apps are allowed to quietly transfer data in the background.
Alternatively, in the sync settings you can also grant just a few select apps the ability to sync and then set the frequency for syncing to a longer interval.

3. Manage your radios
Another way to have a quick impact on battery life is to shut down some of the radios. Nearly all modern smartphones are packed with multiple radio transmitters and each one draws power when they are turned on. Turn them off when you’re not using them. HTC makes this easy on the ThunderBolt because it has a bunch of toggle widgets that you can tap to enable/disable the various radios/features.

I always turn off Bluetooth and GPS, except when needed. If I know I’m going to be on the mobile network for an extended period of time then I turn off Wi-Fi so that the Wi-Fi radio isn’t wasting power searching for connections. One of the things I did to save battery life when I was on the 4G LTE network was to use “Airplane mode” when I was in meetings or other long periods where I knew I wasn’t going to be using the phone. This turns off all of the radios, including the cellular network.

4. Turn down the eye candy
One of the attractive things about the HTC Sense UI — as well as the newer versions of Android and some of its third-party add-ons — is that it has some great eye candy. The animated weather on HTC’s default home screen clock, the live wallpapers that move in the background, and the eye-popping skins and alternative home screens all look great, but they can be an additional drain on the phone’s resources.
I’d recommend using the simple and elegant “Slate” skin (below) on the HTC ThunderBolt. I’d also recommend avoiding the live wallpapers and selecting a static image. For battery savings, I’d also recommend turning off animations by going to Menu | Settings | Display | Animation and selecting “No animations.”

5. Manage apps and widgets
We’ve already talked about how some apps and widgets can slowly siphon resources by syncing in the background. Many apps will also turn themselves on automatically (or remain in memory even after you close them). Of course, the widgets that you put on your various home screens are also running quietly at all times as well, so you’ll need to be wise about which ones you use and keep an eye on them.
To monitor and manage your apps and widgets you’ll need to download a task manager like the popular Advanced Task Killer. This lets you see what you’ve currently got running (and what is quietly turning itself on without your permission). You can do this periodically and manually kill all of your open apps to avoid letting power-hogs drain your battery. Advanced Task Killer even comes with a handy widget that you can place on your home screen. Just tap it once and it kills all your apps, and gives you a short message telling you how many apps were killed.

Even better, open Advanced Task Killer and go into Menu | Setting and set the “Auto Kill” option. I’d recommend setting the Auto Kill Level to “Safe” and setting the Auto Kill Frequency to “Every half hour.” If you’re really paranoid and want to keep stuff under wraps, you can set the Auto Kill so that it wipes everything out every time you turn off your screen. Keep in mind that some people argue that killing processes on Android has dubious value, but I find that it’s a good way of keeping potential battery hogs under control, even if it knocks out some harmless stuff in the process.

Takeaway: It’s official. Verizon is getting the iPhone. There are five big questions that we’ve been hearing in relation to the iPhone 4 launch on Verizon. Here are the answers.

It’s official. AT&T’s deal as the exclusive US carrier for the iPhone has ended (apparently the 4-year deal concluded at the end of 2010), and Verizon is the first new US telecom to add the iPhone to its roster. The long-anticipated move was announced at a Verizon press event at New York’s Lincoln Center on Tuesday in the midst of a circus atmosphere that included the tech press, all of the national news networks, and even The Daily Show.

The iPhone 4 will arrive on Verizon on February 10. Current Verizon customers will be able to pre-order online starting February 3. The price of the iPhone will remain the same: $199 for 16GB and $299 for 32GB, with a two-year Verizon contract. As for the price of Verizon data plans for the iPhone, Verizon coyly stated, “Customers will also be required to activate a data package. Pricing will be announced at a later date.”

It’s odd that the iPhone wouldn’t simply use the existing Verizon 3G data plans. This seems to indicate a couple possible scenarios. Either: 1.) Verizon is going to have a special data plan just for the iPhone (it has been rumored that Verizon would offer a truly unlimited data plan for iPhone), or 2.) Verizon is about to change the price of all of its 3G data plans in conjunction with the iPhone launch.

Beyond the basic details, here are answers to five big questions that we’ve been hearing from our audience in relation to the iPhone finally landing on Verizon:

1. Will it be CDMA or LTE?
Unfortunately, the iPhone 4 will only run on Verizon’s 3G CDMA network and not on its newly-launched 4G LTE network. This was the biggest disappointment of the Verizon iPhone announcement, especially since upcoming Android devices like the HTC Thunderbolt and Motorola Droid Bionic will be running on the LTE superhighway in a few months. At CES last week I tested the HTC Thunderbolt on the Verizon LTE network and was blown away by the desktop-like speeds for loading Web pages. At today’s press event Apple said that including LTE in the iPhone 4 would have involved “design compromises” (probably in size and battery life) and would have taken longer before it was ready to launch. However, both Apple and Verizon stated that this is just the beginning of their partnership (Translation: Expect an LTE-capable iPhone in the future).

2. Will it have mobile hotspot capability?
The biggest surprise of the Verizon iPhone announcement — and arguably the biggest news of the press conference since everything else was pretty much as expected — was that the Verizon version of the iPhone will offer the capability of turning itself into a mobile hotspot that can share its 3G Internet connection over Wi-Fi with up to five devices. Again, no information was provided on whether Verizon will charge extra for mobile hotspot capability. Verizon has wide variations in its treatment of tethering and mobile hotspot charges. It has charged Android users an additional fee for it, but threw it in for free to Palm Pre Plus users. What they do with the iPhone will probably depend on how aggressively the company wants to try to poach current AT&T iPhone customers.

3. Does new Verizon model fix iPhone 4’s antenna?
As you’ve probably heard, when the iPhone 4 first launched last June there were a bunch of customers who experienced antenna problems when holding the iPhone in a way that covered a sensitive portion of the antenna in the lower left-hand corner of the phone. The problem was drastically overblown by the tech press and drastically understated by Apple. In the end, Apple said the problem was significantly reduced if you use an iPhone case and offered free cases to buyers. A number of people have asked if Apple has fixed the problem in this new iteration of the iPhone 4 for Verizon. Naturally, Apple hasn’t said that it has changed anything with the iPhone antenna, but a closer look at the Verizon iPhone shows that it does indeed have a different antenna design and early reports indicate that the Verizon iPhone is not exhibiting the antenna problems.

4. Can you transfer an existing iPhone to Verizon?
The AT&T version of both the iPhone 3GS (which just got a price drop to $50) and iPhone 4 are built on what’s called GSM radio technology (used by both AT&T and T-Mobile in the US). Meanwhile, Verizon and Sprint use a completely different technology called CDMA. The two standards are incompatible. They use different radios and operate on different wireless frequencies. So, no, you cannot take your existing AT&T iPhone and walk into a Verizon store and simply switch networks. Even if you own an iPhone 4 you will have to purchase a completely new iPhone 4 with CDMA chips in order for it to work on Verizon.

5. Will iPhone kill Verizon’s network like it did to AT&T?
Another question that we heard a lot leading up to the expected announcement of the Verizon iPhone today was whether the influx of millions of new iPhone users would bring the Verizon network to its knees the same way it has crushed the AT&T network in areas such as New York, San Francisco, and Los Angeles and at big events like CES and SXSW. I think the answer is “no,” for several reasons. First of all, Verizon is a lot more serious than any of the other US wireless carriers when it comes to network integrity. They aggressively test and audit their own network, so I’ll think they’ll be ready. Second, they just beefed up all of their cell sites to handle additional bandwidth and network load for the launch of their 4G LTE network in 38 cities and they are in the process of upgrading the rest of the US to LTE over the next 24-36 months. Third, while there will be plenty of existing Verizon customers who jump on board with the iPhone and some die-hards who jump from AT&T to Verizon, the vast majority of iPhone customers will remain on AT&T because they are under contract and leaving would be prohibitively expensive.

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