Paying attention to just a few commonsense pointers will pay off with a longer battery lifespan and battery life for your iPhone. The most important thing is to keep your iPhone out of the sun or a hot car (including the glove box). Heat will degrade your battery’s performance the most.

Some Terms You Need to Understand

“Battery life” means the time your iPhone will run before it must be recharged.“Battery lifespan” means the total amount of time your battery will last before it must be replaced.

Viewing Usage Statistics

Awareness of how you use your iPhone and knowing how long your battery typically lasts can help you improve its battery life. You can view your iPhone usage statistics by tapping the Settings icon on the Home screen and choosing General > Usage. Under the “Time since last full charge” heading you’ll see two items:

• Usage: Amount of time iPhone has been awake and in use since the last full charge. The phone is awake when you’re on a call, using email, listening to music, browsing the web, or sending and receiving text messages, or during certain background tasks such as auto-checking email.
• Standby: Amount of time iPhone has been powered on since its last full charge, including the time the phone has been asleep.

Update to the Latest Software

Always make sure your iPhone has the latest software from Apple, as engineers may find new ways to optimize battery performance. Using iTunes 8.2 or later, you can update your iPhone with the latest software. Connect your iPhone to your computer, then select iPhone in the Source List. In the Summary panel, click “Check for Updates” to see if there’s a new version of the iPhone software available. Click Update to install the latest version.

Optimize Your Settings

Depending on how they are configured, a few features may decrease your iPhone battery life. For example, the frequency with which you retrieve email and the number of email accounts you auto-check can both affect battery life. The tips below apply to an iPhone running iPhone 3.0 or later software and may help extend your battery life.

• Minimize use of location services: Applications that actively use location services such as Maps may reduce battery life. To disable location services, go to Settings > General > Location Services or use location services only when needed.
• Turn off push notifications: Some applications from the App Store use the Apple Push Notification Service to alert you of new data. Those applications that extensively rely on push notifications (such as instant messaging applications) may impact battery life. To disable push notifications, go to Settings > Notifications and set Notifications to Off. Note that this does not prevent new data from being received when the application is opened. Also, the Notifications setting will not be visible if you do not have any applications installed that support push notifications.
• Fetch new data less frequently: Applications such as Mail can be set to fetch data wirelessly at specific intervals. The more frequently email or other data is fetched, the quicker your battery may drain. To fetch new data manually, from the Home screen choose Settings > Mail, Contacts, Calendars > Fetch New Data and tap Manually. To increase the fetch interval, go to Settings > Mail, Contacts, Calendars > Fetch New Data and tap Hourly. Note that this is a global setting and applies to all applications that do not support push services.
• Turn off push mail: If you have a push mail account such as Yahoo!, MobileMe or Microsoft Exchange, turn off push when you don’t need it. Go to Settings > Mail, Contacts, Calendars > Fetch New Data and set Push to Off. Messages sent to your push email accounts will now be received on your phone based on the global Fetch setting rather than as they arrive. If the global Fetch setting is set to Manually, you will not be able to locate your iPhone using the MobileMe Find My iPhone feature.
• Auto-check fewer email accounts: You can save power by checking fewer email accounts. This can be accomplished by turning off an email account or by deleting it. To turn off an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and set Account to Off. To remove an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and tap Delete Account.
• Minimize use of third-party applications: Excessive use of applications such as games that prevent the screen from dimming or shutting off or applications that use location services can reduce battery life.
• Turn off Wi-Fi: If you rarely use Wi-Fi, you can turn it off to save power. Go to Settings > Wi-Fi and set Wi-Fi to Off. Note that if you frequently use your iPhone to browse the web, battery life may be improved by using Wi-Fi instead of cellular data networks.
• Turn off Bluetooth: If you rarely use a Bluetooth headset or car kit, you can turn off Bluetooth to save power. Go to Settings > General > Bluetooth and set Bluetooth to Off.
• Use Airplane Mode in low- or no-coverage areas: Because your iPhone always tries to maintain a connection with the cellular network, it may use more power in low- or no-coverage areas. Turning on Airplane Mode can increase battery life in these situations; however, you will be unable to make or receive calls. To turn on Airplane Mode, go to Settings and set Airplane Mode to On.
• Adjust brightness: Dimming the screen is another way to extend battery life. Go to Settings > Brightness and drag the slider to the left to lower the default screen brightness. In addition, turning on Auto-Brightness allows the screen to adjust its brightness based on current lighting conditions. Go to Settings > Brightness and set Auto-Brightness to On.
• Turn off EQ: Applying an equalizer setting to song playback on your iPhone can decrease battery life. To turn EQ off, go to Settings > iPod > EQ and tap Off. Note that if you’ve added EQ to songs directly in iTunes, you’ll need to set EQ on iPhone to Flat in order to have the same effect as Off because iPhone keeps your iTunes settings intact. Go to Settings > iPod > EQ and tap Flat.
• Turn off 3G: Using 3G cellular networks loads data faster, but may also decrease battery life, especially in areas with limited 3G coverage. To disable 3G, from the Home screen choose Settings > General > Network and set Enable 3G to Off. You will still be able to make and receive calls and access cellular data networks via EDGE or GPRS where available.

Lock Your iPhone

It may seem obvious, but you should lock your iPhone when you aren’t using it. You will be able to receive calls and text messages while it is locked, but nothing happens if you touch the screen. To lock iPhone, press the Sleep/Wake button. You can also set the Auto-Lock interval so your iPhone will turn off more quickly after a period of inactivity. To set Auto-Lock, go to Settings > General > Auto-Lock and set the interval to a short time, such as 1 minute.

Use iPhone Regularly

For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

source : apple.com

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Paying attention to just a few commonsense pointers will pay off with a longer battery lifespan and battery life for your iPod. The most important thing is to keep your iPod out of the sun or a hot car (even the glove box). Heat will degrade your battery’s performance the most.

Some Terms You Need to Understand

“Battery life” means the time your iPod will run before it must be recharged (sometimes this is also called “playtime” or “runtime”). “Battery lifespan” means the total amount of time your battery will last before it must be replaced.

Update to the Latest Software

Always make sure iPod has the latest software from Apple, as engineers may find new ways to optimize battery performance. For instance, early iPod models without a dock connector benefit from update 1.3 or later. Using iTunes 7.4 or later, you can update your iPod with the latest software. Put your iPod in its dock or plug it into your computer and iTunes will notify you if an update is available.

Use iPod Regularly

For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month. If you use your iPod infrequently (gasp), you might want to add reminder to your calendar program.

Extend Your Battery Life

If you want to extend the battery life of your iPod for any given charge cycle, you may conserve power by following these tips.

Hold and Pause

It may seem obvious, but set the Hold switch when you aren’t using your iPod. This will prevent iPod controls from inadvertently waking up iPod and using unnecessary power. Also, if you are not listening to iPod, pause it, or turn it off by pressing the play button for two seconds.

Optimize Your Settings

There are a few features that use your iPod battery more quickly. If you don’t use these features, your iPod will play tunes longer.

• Wi-Fi: Wi-Fi consumes power even if you are not using its features to connect to a network. You can turn it off to save power. Go to Settings > General > Network > Wi-Fi.
• Backlight: Setting the backlight to “always on” will significantly reduce your battery life. Only use the backlight when necessary.
• Equalizer: Adding EQs to playback uses more of your iPod processor, since they aren’t encoded in the song. Turn EQ off if you don’t use it. If, however, you’ve added EQ to tracks in iTunes, you’ll need to set EQ to “flat” in order to have the effect of “off,” because iPod keeps your iTunes settings intact.
• Minimize use of third-party applications: Excessive use of applications on iPod touch, such as games that prevent the screen from dimming or shutting off, can reduce battery life.
• Fetch new data less frequently: Applications on iPod touch such as Mail can be set to fetch data wirelessly at specific intervals. The more frequently email or other data is fetched, the quicker your battery may drain. To fetch new data manually, from the Home screen choose Settings > Fetch New Data and tap Manually. To increase the fetch interval, go to Settings > Fetch New Data and tap Hourly. Note that this is a global setting and applies to all applications that do not support push services.
• Turn off push mail: If you have a push mail account on iPod touch such as Yahoo!, MobileMe, or Microsoft Exchange, turn off push mail when you don’t need it. Go to Settings > Fetch New Data and set Push to Off. Messages sent to your push email accounts will now be received on your iPod touch based on the global Fetch setting rather than as they arrive.

Maximize Your Memory

iPod plays music out of a solid-state memory cache to provide skip-free playback and maximize battery life. iPod spins its hard drive to fill this cache, which uses power. A couple of factors affect how often this happens, and if you minimize these factors, you’ll extend battery life.

• Limit Fast-Forwarding: If you fast-forward through your playlist, iPod has to fill its cache more frequently, thus accessing the hard drive more often and using more power. This decreases overall battery life. By creating great playlists in iTunes that cater to your personal taste, you can decrease your need to fast-forward. Using the shuffle feature may also help to minimize your use of the fast-forward feature.
• Use Compressed Songs: The iPod cache works most efficiently with songs of average file sizes (less than 9MB). If your audio files are large or uncompressed (including AIFF or WAV format), you may want to compress them, or use a different compression method, such as AAC or MP3, when importing them into iTunes. Also, consider breaking very long songs or tracks into shorter tracks that have smaller file sizes. If you encode your music at 128 Kbps, your iPod will fill its cache about every 25 minutes.

source : apple.com
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With a little bit of care, you can maximize the battery life (i.e. the time your battery will run before it must be recharged) and lifespan of your notebook's battery. Most importantly, use your Apple notebook in its comfort zone for temperature (See “Notebook Temperate Zone”). Don’t leave it locked in a hot trunk during the summer

Your New Notebook

Be sure to fully charge your portable when you plug it in for the first time, and then run Software Update to ensure you have the latest software. Apple periodically releases updates that may improve battery performance.

Standard Maintenance

For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her MacBook Pro on the train, then plugs it in at the office to charge. This keeps the battery juices flowing. If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month. Need a reminder? Add an event to your desktop’s iCal.

Long-Term Storage

If you don’t plan on using your notebook for more than six months, Apple recommends that you store the battery with a 50% charge. If you store a battery when it’s fully discharged, it could fall into a deep discharge state, which renders it incapable of holding any charge. Conversely, if you store it fully charged for an extended period of time, the battery may experience some loss of battery capacity, meaning it will have a shorter life. Be sure to store your notebook and battery at the proper temperature. (See “Notebook Temperate Zone.”)

Optimal Setting

You can choose to use your Apple notebook in a way that maximizes its battery life.

• Energy: The Energy Saver control panel offers several settings that determine power levels for your PowerBook. Your portable knows when it’s plugged in, and runs accordingly. When on battery power, it will dim the screen and use other components sparingly. If you change this setting to maximize performance, your battery will drain more quickly.
• Brightness: Dim the screen to the lowest comfortable level to achieve maximum battery life. For instance, when watching a DVD on an airplane, you may not need full brightness if all the lights are off.
• AirPort Wireless: AirPort consumes power, even if you are not using its features to connect to a network. You can turn it off in its control panel to save power.
• Bluetooth Wireless: Likewise, you can turn off Bluetooth to maximize your battery life, as it also consumes power when not in use.
• Applications and peripherals: Disconnect peripherals and quit applications not in use. Eject CDs and DVDs if not currently accessing them.

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Rechargeable lithium-based technology currently provides the best performance for your Apple notebook computer, iPod, or iPhone. You can also find this standard battery technology in many other devices. Apple batteries share the characteristics common to lithium-based technology in other devices. Like other rechargeable batteries, these batteries may eventually require replacement.

Standard Technology
Lithium-ion polymer batteries pack in a higher power density than nickel-based batteries. This gives you a longer battery life in a lighter package, as lithium is the lightest metal. You can also recharge a lithium-ion polymer battery whenever convenient, without the full charge or discharge cycle necessary to keep nickel-based batteries at peak performance. (Over time, crystals build up in nickel-based batteries and prevent you from charging them completely, necessitating an inconvenient full discharge.)
lithium-ion Battery Charge Chart


Standard Charging
Most lithium-ion polymer batteries use a fast charge to charge your device to 80% battery capacity, then switch to trickle charging. That’s about two hours of charge time to power an iPod to 80% capacity, then another two hours to fully charge it, if you are not using the iPod while charging. You can charge all lithium-ion batteries a large but finite number of times, as defined by charge cycle.
Charge cycles

Charge Cycle. Using and recharging 100% of battery capacity equals one full charge cycle.


A charge cycle means using all of the battery’s power, but that doesn’t necessarily mean a single charge. For instance, you could listen to your iPod for a few hours one day, using half its power, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two, so you may take several days to complete a cycle. Each time you complete a charge cycle, it diminishes battery capacity slightly, but you can put notebook, iPod, and iPhone batteries through many charge cycles before they will only hold 80% of original battery capacity. As with other rechargeable batteries, you may eventually need to replace your battery.

How to Maximize Power Use
The length of time your battery will power your device depends on how you use it. For instance, watching a DVD will use up your notebook battery’s power more quickly than simple word processing. You can follow some easy steps to maximize your notebook, iPod, or iPhone battery life.

source : apple.com

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