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Old April 9th, 2010, 06:20 PM   #1 (permalink)
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Exclamation ***Official HTC Evo 4g Battery Thread***


Breaking-In” the battery:
  1. The Battery: (directly from the user guide)
    • Charge the battery
      (Do this before you use it for the 1st time! HTC recommends charging it the first time for 8 hours.)
    • The battery in your phone hasn’t been charged yet. While your phone is charging, it’s important that you do not remove the battery pack. Doing so can damage your phone. Also, please don’t try to take your phone apart. (If you do, it may invalidate your warranty.)
    • Your phone comes with a rechargeable Lithium-ion polymer or Lithium-ion battery and is designed to use only manufacturer-specified original batteries and accessories. Battery performance depends on many factors, including network configuration, signal strength, the temperature of the environment in which you operate your phone, the features and/or settings you select and use, items attached to connecting ports, and your voice, data, and other program usage patterns.
  2. Inserting the battery:
    • Remove the back cover. Refer to “Removing the back cover.”
    • Insert the contacts side of the battery first and then gently push the battery into place.
  3. Removing the battery:
    • Remove the back cover. Refer to “Removing the back cover.”
    • Lift out the battery from the notch near the speaker.
  4. Charging the battery:
    • The battery is partially charged when shipped. Before you turn on and start using your phone, it is recommended that you charge the battery. Some batteries perform best after several full charge/discharge cycles.
      • Attach the power plug to the AC adapter.
      • Connect one end of the USB cable to the sync connector on your phone.
      • Connect the other end of the USB cable to the USB port of the AC adapter
      • Plug the AC adapter into an electrical outlet to start charging the battery.
    • As the battery is being charged, the notification LED shows a solid red light when the battery is being charged. The light turns to solid green when the phone is fully charged. When you charge the battery while the phone is on, the charging battery icon is displayed in the status bar of the Home screen. After the battery has been fully charged, a full battery icon will be displayed in the status bar of the Home screen.
      • Use only an approved charging accessory to charge your phone.
      • Do not remove the battery from the phone while you are charging it using the AC or car adapter.
      • As a safety precaution, the battery stops charging when it overheats.

Kappy’s tip: I believe a proper calibration of the battery meter on the phone is important (At least 1 full charge and discharge, but possibly 3-5 full charge/discharge cycles). Before using the phone for the first time (this is great if you order online or pre-order the phone), plug the phone in and let it charge (turned off) fully. HTC recommends charging it the first time for 8 hours! I know at the store they turn it on and program it for you and whatnot, but after that I would turn it off, go home, and charge it fully. I know this is hard to do, but “good things come to those who wait” :-)

Train/Condition the battery:
Kappy’s tip: Notice #13 below. I totally agree with this! It has been said that with today’s modern re-chargeable batteries they do not have memory and you do not have to worry about over-charging them. I agree and disagree with that. From my personal experiences I seem to notice that if I re-charge the battery with most of its life left (70%+) or leave it on the charger over night, my battery dies quicker (this may not be an issue with the battery, but my battery meter on the phone needing to be calibrated). I used to ALWAYS do this and have now stopped. I recommend charging your battery when it is 50% or LOWER and letting it charge to full capactiy if possible (and charge with the phone turned off).

I also recommend that at least once a month letting the battery run down to the red (10% or lower) and fully charging it turned off. That keeps it fresh and keeps the battery monitoring system on the phone as accurate as possible. DO NOT let your battery sit dead for an extended period of time or plugged in to a power source fully charged for an extended period of time. Also, try not to use your phone a lot or for an extended amount of time (until it dies) in the red. I do not recommend fully discharging the phone often. Once a month (or 30 charges) is fine.

Extending your battery life:
Kappy’s tip: Remember, conditions such as signal strength, how many programs/applications you have running at once, and how old your battery is will determine battery life. The following are steps I feel you can take to extend your battery life:
  • Download power-saving widgets or add them to your home screen. Some will already be on the phone (see pages 36, 37, 127, and 138 of the user guide). These will allow you to easily turn off bluetooth, wifi, and data. I also recommend turning off GPS. I would turn these off when not in use. (See attached thumbnail. Thanks GeorgeH!)
  • Turn down the screen brightness. Keep it at an acceptable level.
  • Adjust screen shut-off time or use the power key to turn off the screen immediately when you’re done using it.
  • Turn off some and/or all push notifications if not needed (e-mail, facebook, MySpace, twitter, etc).
  • Turn off live wallpapers or anything else “live”.
  • Limit speakerphone use.
  • Turn off haptic feedback/vibrations.
  • Turn off any key tones.
  • Keep ringer volume and ear piece volume as low as you personally can.
  • DO NOT let the battery become ultra hot or keep it in a hot car for an extended amount of time.
  • Periodically clean the battery contacts of any dust/dirt.
  • Use wifi when possible.
  • Limit game playing.
  • Watch your camera use, especially if using the flash. *Thanks floorit!
  • Use a task-killer? This has been debated and is up in the air. I only suggest using one if you are having trouble closing programs or have really poor battery life.
  • Regarding “sense”. You can create profiles and add different power management widgets to those profiles. This could help for those who really like to customize their phone. *Thanks GeorgeH!
  • Watch out for applications that are constantly updating or using data.

Applications that (have been known to) drain battery life:
  • Handcent SMS (There was a bug, it should be fixed now) *Thanks NKT!
  • Weatherbug (If you leave location on. It tracks your location so it can update the weather at that location) *Thanks NKT!

I think the information I have listed above and the information below could be helpful to all of us so we get the most out of each battery cycle. Remember, your battery will die at some point :-(. It is okay, because we can replace the battery! PLEASE REMEMBER to recycle your dead battery appropriately! Talk to the phone techs at your local Sprint store for more tips and information. Don’t forget to play around with your settings and try your own techniques to preserve battery life and please share with the rest of us!

And for Steven58 =D You can always purchase an extra or extended battery to keep with you! Thank you to everyone who has helped me with this and I hope it will be helpful to everyone. Feel free to contact me about adding any more information!


From “Optimizing your Droid Eris battery life” thread:
  1. The stock visual voicemail app, if active is known to keep your phone "awake" there is no way to uninstall this app, just don't use it. Also the Youmail app will keep your phone "awake" as well.
    *For the below 4 settings (tips 2, 3, 4, and 5) you can easily set toggles on your home screen to flip these on and off with one touch. Simply hold an open spot on your home screen to add widget, pick HTC widgets, pick settings, then add whatever widget you want to control.
  2. Turn wifi off when not using it (settings>wireless controls>wifi on or off)
  3. Turn GPS off when not using it (settings>location>turn gps on or off)
  4. Turn Bluetooth off when not using it (settings>wireless controls>turn bluetooth on or off)
  5. Turn Mobile Network off when not using it (settings>wireless controls>turn mobile network on or off) (if both this and wifi are disabled you will not be connected at all to the internet. the only thing you will be able to do is make/receive phone calls and send/receive sms messages, this will give you tremendous battery savings though)
  6. Turn off audible touchtones (settings>sounds and display> audible selection)
  7. Turn off haptic feedback for typing and touchscreen inputs (with keyboard up press the gear for settings>sound feedback and vib when typing OFF)
  8. Also turn off screen animations. (settings>sounds and display> animations)
  9. Turn screen brightness down to a moderate level.
  10. Turn on disable auto backlight. (settings>sounds and display> disable auto backlight)
  11. You can set screen time out to 30 second, I leave mine at a minute, thing is just to remember to hit your red call end button when putting the phone down.
  12. Turn off auto-sync for your Google account features (setting>data synchronization>Google)
  13. Conditioning the battery by letting it run all the way down and then charging it up seems to help a lot. For best results, do this three days in a row.
  14. It is reported that using wifi rather then 3g service from Verizon uses less if you are in an area for an extended period of time with wifi available use it and see.


User guide to optimizing the phone’s battery life:
When you’re on the go, it’s not always easy to charge your phone’s battery as often as you’d like. Follow these tips to extend the time between charges:
  • Turn off wireless functions such as Bluetooth, Wi-Fi, and data connection when you’re not using them. See the Internet and Bluetooth chapters for details.
  • Do not use GPS satellites to determine your GPS location. See the Maps & Location chapter for details.
  • Lower the screen brightness. See “Adjusting the screen brightness manually” in this chapter for details.
  • Switch off screen animations. See “Switching animation effects on or off” in this chapter for details
  • Cut down on activities such as Internet browsing. Wireless data consumes a lot of power.
  • Avoid making very long phone calls or using the camera for extended periods of time.
  • Consider carrying a spare battery for times when you can’t charge your battery for an extended period.
  • Batteries gradually lose storage capacity over time. Consider replacing your battery after eight months to a year, or if you notice that the battery life is decreasing.
Checking the power usage of applications:
  • Press HOME > MENU, and then tap Settings.
  • Scroll down the screen, and then tap about phone > Battery > Battery use.

Websites w/more battery information:
To purchase extended batteries:*I would stay away from e-bay batteries and/or cheap, discounted batteries.

Other Member Tips:

  • Trickle charging is not what you people are referring to. If I have a batter made to accept a charge at 10 volts, trickle charging is putting a 2 (or any number less than 10) on it, and getting a smaller current flow. Lithium batteries CAN NOT do this. It ruins the batteries. The ones in your phone will accept a charging voltage at about 5V (USB spec). When you say trickle charge, you mean charge at less than 1 ampere (USB spec is 500mA). There is never any reason for you to charge your battery at anything other than 5V +/- 5% or so. All chargers and USB ports do this. Although in an emergency you can use something else (I have seen a 9V used in emergency b/c current flow is a more important thing no to exceed), it is not advisable nor logical to do that for everyday charging.
  • Batteries live longer with a slower charge and moderate discharge rate. Although 1A may be within the appropriate tolerances of your battery (it is what your chargers are set as their max), a 500mA charge if you have the time may be healthier in the long run. Note these are all maximum currents. Depending on the resistance of your charing circuitry and battery, you may be getting less current. The circuit just trips at the max. The voltage is the invariable specification on chargers (except exotic ones that you will probably never use to charge a phone).
  • When charging, your battery goes up to out 4.20V per cell. It almost guearenteed has a built in circuit to stop charging at 4.30 V/cell, as that is the border of unsafe. The time you spend at 4.20V/cell should be minimized.
  • Lithium ion batteries require no break in or anything of that sort. The first charge is as effective as the 30th, and that is it. That being said, a complete charge and discharge will calibrate the digital charge estimator, and your battery does auto shutoff when the charge is too low (it prevents itself from dropping to "OMG my batter no longer holds a charge after that last discharge" level), so make your own call. Perhaps no more than once a month? I usually do it if I notice the battery indicator is too off, as it getting 3 hours off a charge after it says 10% remaining. I also do it when I first get the battery...I play with it, full charge, full discharge, full charge, possibly another full discharge if it happens (if not, it is probably still calibrated), and that is it.
  • Lastly, a point on how a battery charges. It goes up to about 70% charge, and then tops off as the current drops down to about 10% of the initial current. Fast chargers only go up to 70%. The last part, the topping current, takes about 2x the time the first part does. Thanks NKK!
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Last edited by twospirits; June 1st, 2010 at 09:36 PM.
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