How to make your smartphone battery last longer in a disaster
There are various kinds of disaster damages. For travelers in Japan, a power failure would be unexpectedly awful. In 2018, by earthquakes and typhoons, power transmission networks were frequently destroyed, and power failures over several days occurred in some areas in Japan.
I guess a lot of people intend to use smartphones to collect information in Japan where you cannot understand their language. However, once a power failure occurs, you cannot charge a smartphone. In due course, a battery will run out the next day.
It is very lonely and dangerous to be isolated without information in a foreign country. First of all, when a power failure occurs, let's try to reduce power consumption of the smartphone and let it last as long as possible.
Technique to reduce power consumption of smartphone
By taking the measures shown below, it is possible to minimize battery drain.
● Decrease screen brightness
Screen backlight consumes power most in a smartphone. Lower the brightness of screen from “Setting” of the system.
● Terminate running applications.
When an application is running, the power consumption increases accordingly. Terminate as many applications as possible, leaving only ones necessary for getting in touch with the outside.
● Change network modes
Wireless communication also consumes a lot of power. Changing the wireless connection setting of Internet will reduce battery drain.
In Japan, 2G (GSM) communication which is common in EU has not spread so much. Please set "LTE / 3G" or "4G / 3G" as standby setting. If a power failure occurs, a base station of communications may also be down, or communications may be restricted due to overcrowding. It is more effective to save battery while waiting for the restoration, setting “airplane mode” to disconnect a line of communication for 2 ~ 3 hours, rather than hastily trying to connect into the Internet.
It is better to set up the connection only for free Wi-Fi service at hotels and other accommodation facilities. Even during the time of power failure, the communication environment of facility may be kept available with uninterruptible power supply, etc.
What not to do to save electricity in a disaster
There are settings that you should not do in the event of a disaster though they could reduce power consumption.
● Turning GPS off
Although having a power saving effect, this would make you unable to search evacuation routes, and transmit location information when calling for help via twitter. Power consumption of GPS is not so big. It is better not to turn it off.
●Turning “Sync” off
Although this also has the effect of reducing power consumption, the evacuation may be delayed as safety confirmation and emergency message etc. would not reach in real time.
Let’s check setting of your smartphone in advance.
Before you encounter a power failure, it is useful to check what functions your terminal has. Depending on models, your smartphone may have power saving settings and a power saving feature that can be switched with one touch. It's also good to try a power-saving apps.
In many disasters in Japan, as mobile base stations came to devastated areas the following day, the communication environment was restored even in case of a power failure. By changing the settings cleverly and making a battery power last longer, you will be able to reduce the risk of isolation without information.