Tip 1. Keep your iPhone out of the sun and hot places such as your car or cars glove compartment. Excessive heat will have the most damaging effect on your battery life. Room temperature is the ideal temperature for your iPhone battery.
Tip 2. Update to the latest software as Apple engineers may find new ways to optimise battery performance. You can do this by connecting your iPhone to your computer and selecting 'iPhone' in the source list. Then in the summary panel click 'Check for Updates' to see if there are any newer versions to your current software. Click 'Update' to install the latest version.
Tip 3. Minimise the use of applications that use location services such as Maps. To disable location services go to Settings>General>Location Services and use the location services only when needed.
Tip 4. Turn off push notifications as some applications use this to alert you of new data. These applications that extensively rely on push notifications may impact on your battery life. To disable these go to Settings>Notifications> and set Notifications to Off.
Tip 5. Fetch data less frequently. Applications such as mail can be set to fetch data wirelessly at specific intervlas. The more frequently email or other data is fetched, the quicker your battery life will run out. To save battery life it is better to fetch new data manually by going on the application yourself when you want to check if you have new mail etc. To do this go to Settings>Mail, Contacts, Calendar>Fetch New Data and chose Manually.
Tip 6. Turn off push mail. If you have a push mail account such as Yahoo!, MobileMe or Microsoft Exchange then turn off the push notifications when you don't need them. To do this go to Settings>Mail, Contacts, Calendar>Fetch New Data and set Push to Off. Your messages will now only be received on your phone, based on the global fetch setting rather than when they arrive.
Tip 7. Auto-check fewer email accounts. If you use less email accounts, this will save you some battery life. You can do this by turning off an email account or deleting it. Go to Settings>Mail, Contacts, Calendars, choose an email account and set Account to Off. To remove an email account go to Settings>Mail, Contacts, Calendars and choose the email account that you want to delete.
Tip 8. Minimise the use of third-party applications. Excessive use of apps such as games that prevent the screen from dimming or apps that use locations services can reduce your battery life.
Tip 9. Turn off your Wi-Fi. If you rarely use it then turn it off to save your battery life. To do this go to Settings>Wi-Fi and set Wi-Fi to Off. Note that if you browse the web regularly on your iPhone then use Wi-Fi instead of mobile data networks, as this method uses less power.
Tip 10. Turn off Bluetooth. If you rarely use it then turn it off to save power. To do this go to Settings>General>Bluetooth and set Bluetooth to Off.
Tip 11. Use Airplane Mode in low or no coverage areas. Your iPhone will always try to maintain a connection with the mobile network and may use more power in a low or no coverage area. Turning it on Airplane Mode can increase your battery life in these situations, but you will be unable to make calls or receive texts. To do this go to Settings and set Airplane Mode On.
Tip 12. Adjust the brightness. By dimming the screen you can extend your battery life. To do this go to Settings>Brightness and drag the slider to the left to lower the default screen brightness. Also, you can turn on Auto-Brightness to allow the screen to adjust its brightness based on the current lighting conditions. To do this go to Settings>Brightness and set Auto-Brightness to On.
Tip 13. Turn off the equalizer. To turn off the EQ go to Settings>iPod>EQ and choose Off. Note that if you've added EQ songs directly in iTunes then you'll need to set EQ on your iPhone to Flat in order to have the same effect as Off because your iPhone keeps your iTunes settings intact. To do this go to Settings>iPod>EQ and choose flat.
Tip 14. Turn off your 3G. Using 3G mobile networks will load data faster but may also decrease battery life, especially in areas with limited 3G coverage. To disable 3G go to Settings>General>Network and set Enable 3G to Off. You will be able to make and receive calls and access mobile data networks via EDGE and GPRS where available.
Tip 15. Lock your iPhone. If you aren't using it then lock you iPhone, you will still be able to receive calls and texts but nothing happens if you touch the screen. To lock your iPhone press the Sleep/Wake button (on the top right hand side of your iPhone). You can also set the Auto-Lock interval to a shorter time so it will turn off quicker after a period of inactivity. To set this go to Settings>General>Auto-Lock and set the interval to a short time such as 1 minute.
Tip 16. Use your iPhone regularly. It's important to keep the electrons in lithium-based batteries moving occasionally. Be sure to go through at least one charge cycle per month. This is where you charge the battery to 100% and then completely running it down.
Tip 17. Take off your case. Certain cases may generate excess heat which can affect battery capacity. If you notice your iPhone gets hot when you charge it then take it out of its case first.
Tip 18. View your usage statistics. To do this go to Settings>General>Usage to view your:
Usage - the amount of time your iPhone has been awake and in use since the last full charge
Standby - the amount of time your iPhone has been powered on since its last full charge, including the time the phone has been asleep
Knowing this can help you change how you use your iPhone to optimise its battery life.
Tip 19. Turn off Vibration. To do this go to Settings>Sounds and under Vibrate set it to Off.
Tip 20. If you have Siri on your iPhone turn off 'Raise to Speak' by going to Settings>Siri and choosing Off.