Publish this as part of a home emergency survival series. See if we can get back up battery manufacturer advertise.
Finish rewriting, especially do not stream. clarify terminology, "extra connections", "push"
credit http://news.cnet.com/8301-1035_3-57542254-94/smartphone-survival-guide-how-to-stretch-your-battery-life/?tag=nl.e214&s_cid=e214. See if there any worthwhile comments with additional ideas to include.
Write to iPhone, android if they have any additional thoughts
In an emergency, your smartphone may be your household's lifeline. Here's how to keep it alive as long as possible during a power outage:
Share phones. If you're with a group of people, Have only one phone on at any given time to maximize the overall life. If necessary, write down critical phone numbers before turning off the devices -- but better yet keep a printout of your contacts and a laminated copy of emergency contact numbers.
Turn off extra wireless connections. High power connections that you can live without during an emergency include Bluetooth, Wi-Fi, 4G, GPS and location services.
Switch to airplane mode to shut off all of the radios, and switch back out of airplane mode only when you need to make a call or send a text message.
Close unnecessary apps. A lot of applications, e.g. e-mail, run in the background or get their own push notifications. Close these applications to ensure that your phone isn't still pinging the network without your knowledge.
Limit use. Each time you turn on the display, you're cutting into the phone's battery life.
Keep your phone plugged in. If, for the moment you still have power, keep your phone plugged in. When the power goes out, your phone Will be fully charged.
Charge backups. Do you have an extra battery? Make sure that's charged up. Alternatively, a fully charged laptop can also be used as a battery of sorts, since it can charge a phone through a USB connection.
Do not stream. If you must listen to music or video (why?), don't use streaming services, which constantly puts a strain on the phone's battery. Only play videos or songs already loaded on the phone. If you must play games (why?), do not play games that require a connection, like "Words With Friends" or "The Simpsons: Tapped Out," or games that require phones to rev up their processors, such as the "Infinity Blade" series.
Dim the display. Displays actually take up quite a bit of power, particularly if the phone has a large and bright screen. Most phones have an automatic brightness option, though you could manually dim the screen to preserve battery. Lock the phone and turn off the display as much as possible.
Send text messages instead of calling. Because of the nature of text messages, the conversation is usually kept short and concise. Phone calls can drag on, sucking up valuable battery life, but a text message gets the information out far more efficiently, and isn't constantly running.