Our cell phones are such a huge part of our lives that seeing 7% on the battery indicator can be as alarming as feeling ourselves about to pass out. But while we all know what to do to boost our own energy, it's not always obvious how to keep our handheld devices fully (or partially) charged. To that end, DealNews has gathered up the nine best tips for squeezing extra life out of your phone's battery. See Your Biggest Drains Knowledge is power! Before you start tweaking things to extend your battery life, see where your power is going. This process varies a bit from phone to phone, but in general: Android phones: Settings > Battery iPhones: Settings > Battery > Battery Usage This will give you an idea of what your biggest drains are and let you effectively target your battery conservation efforts. Reduce Screen Brightness Manually reducing your screen brightness is one of the most effective things you can do to improve battery life, though you'll likely have to manually increase it again when you're outdoors in order to read the screen. Some people have found they can nearly double their battery life by going from maximum to minimum brightness. SEE ALSO: When's The Best Time to Buy the Most Popular Smartphones? Note that you must change this manually. You may be familiar with your phone's "auto-brightness" feature and assume it's already managing this for you, but that's not the case. While this setting will change your brightness for you (and save battery when you're in low-light situations), it's still usually a battery drain. Why? When auto-brightness is on, the phone is constantly checking its sensor data and doing calculations to determine the appropriate brightness, which often takes nearly as much energy as the feature is saving (or more!). Turn Off Unused Hardware GPS is usually the largest and most noticeable battery drain, but Bluetooth, WiFi, and your mobile data antennae use power, too. While you may be loath to cut yourself off from the world, you probably aren't using WiFi during your nature hike, and some people may rarely or never use Bluetooth. If power's tight, cut down your data links to what you're really using. It might not save a ton of energy, but every little bit helps. Turn Off the Vibrate Feature The motor that makes your phone vibrate actually takes a fair amount of juice to power, and can drain your battery quickly. If you're low on battery, make do with visual or audio alerts. Turn Off Notifications Do you really need to know instantaneously when someone has "liked" your Facebook status? OK, maybe you do. But if you can wait until you open the app to get updates, you'll save a little juice. You may need to leave some of them running (like your email), but you may be able to do without others, like Instagram, Facebook, or Twitter. Android phones: Settings > Apps. Then choose individual apps and uncheck "Show notifications." (Note that this process can vary depending on which Android build you're using.) iPhones: Settings > Notifications You may find you can further preserve battery life through individual app settings. For example, you could reduce email sync frequency or disable auto-upload of photos. SEE ALSO: All the iPhone 8 Rumors You Need to Know Keep Your Apps Updated This one's simple enough: Make sure you're running the most recent version of all your favorite apps. Developers often optimize old code to run more efficiently. Enable "Power Saving Mode" (If You Have One) Not every phone has a power saving mode (iPhones running older operating systems don't), but if yours does, it can be a quick way to drastically decrease your drain in a pinch. Check your "Settings" menu to see if the option is listed. Beat the Heat While it might not make a difference to an individual charge, heat can degrade battery performance over time. Try not to leave your phone lying in direct sunlight, and consider changing or removing your case if you frequently notice it running hot. "Captain, She Needs More Power!" Don't want to fiddle with all these settings? Pick up a portable charger and keep it topped off, so you always have an extra power source in a pinch. Many modern cell phones have between 2,500mAh and 3,000mAh batteries, and DealNews regularly lists battery backups even above that range for under $10. If you're willing to pay a bit more, you can easily find portable power banks that have 20,000mAh or more. That's enough for a day's use of even the most power-hogging applications, or more moderate use for extended periods — such as camping trips or power outages. Readers, did we miss an important power-saving tip? Let us know in the comments below! Related DealNews Blog Posts: All the iPhone 8 Rumors You Need to Know 9 Things You Should Know About the Samsung Galaxy S8 When's The Best Time to Buy the Most Popular Smartphones?