5 ways to keep your phone charged in a power outage

And when the power goes out, these gadgets can quickly become stylish but useless bricks.

As Hurricane Sandy pummels the Northeast, now is the time to be juicing up the mobile devices you use to stay connected. Also, don't forget about backup devices like that BlackBerry you got from work, tablets and even e-readers that have Web access.

But when the lights go out, you're on your own. Here are some tools and tips to try to keep you connected longer.

If you have time to grab some gear now:

A backup charger for your phone or tablet can can keep you linked in longer.

"Juice packs" can be bought for $100 or less (Mophie, for one, makes them for Apple and Android devices) and many of the chargers double as protective cases for your smartphone or tablet. Alternately, battery-powered backup chargers like the Zagg Sparq can provide several full charges for your mobile devices after the usual electrical options are gone.

You can even find chargers that use solar power. So as long as you've got a dry spot and at least a brief break from the rain, Mother Nature can help bail you out.

And don't forget about your car charger, assuming you have one. Your car's battery will be solid long after you're phone's isn't.

Power inverter

If you need to power up something a little bigger than a phone, a power inverter might be a useful tool. If you want to be able to use a laptop or desktop computer during an outage, this may be the way to go.

The inverter can be used to convert DC power from your car battery into AC juice for things usually plugged into a wall outlet.

Places like Batteries Plus, as well as most computer stores, usually have these around in a wide range of power. Ask an employee how much of a charge you need for what you want to do.

Here are some other tips if you don't have the option of buying new chargers:

Laptop as back-up generator

This one seems obvious ... once you've thought about it. But it's the sort of thing that can slip your mind when there's a lot of other preparation to be done.

While there's time, fully charge your laptop (or, best case, laptops).

Then don't use it. When other power sources go out, you can plug your phone or tablet into the laptop, via the USB port, for the extra juice.

Stop running apps

Check your phone's settings. Some apps quietly run in the background even when you're not using them, causing your battery to drain faster. Wi-Fi and Bluetooth are two examples, but there are plenty of others. Here's a video for how to disable Wi-Fi on an iPhone and a walkthrough for how to control battery usage on Android devices. (Hat tip to Quartz.com).

Also, texting burns less power than a phone call, so go that route when you can. And turning down your screen's brightness will also help conserve juice.

Use a battery-life app

Several free apps for both iOS (Apple) and Android devices promise to help you extend your phone's battery life. One such app is Carat, which observes how you use your smartphone and makes personalized suggestions about which power-sucking apps you might delete.