The ULTIMATE Guide to make your smartphone battery lasts longer

Introduction

A marketing survey reveals that everyone wishes their battery to last for preferably 2 days or more. However, many are disappointed when their new phone fails them when it fails to last for 8 hrs. Why? Indeed, 37% of the responders felt that the lifespan of the mobile phone is too short.

There are websites which spelt out the tips and tricks to conserve your mobile phone battery. Unfortunately, they are only covering major aspects of the topics and give general tips. So far, none of the website provides a complete guide on the determining factors and squeeze battery till the last watt. I will try to fulfill this role here.

Selecting a phone that suits your lifestyle

All 3G phones have Bluetooth and GPRS. Certain models have Wifi, GPS or Email client which may deplete the battery faster. The size of the screen is another crucial factor of the battery life. 3.5G promises HSPDA which speed up the download speed of phone. With a data plan, 3.5G phone is the best buy for the bucks. With many applications installed in the phone, the battery life becomes the most important factor before you grab it.

When you select a phone, you must check if the phone is powered by an adequate battery. Based on the manufacturer's specification, it is good to estimate the estimate real lifetime of the phone at use. I shall term it the REAL BATTERY LIFE (RBL). RBL of a mobile phone (hrs) is defined as the multiplication of the standby time found in the specification and the RBL percentage. RBL percentage is derived from the average battery life of mobile phone in real life as spelt out below:

RBL Percentage	2G	3G without data plan	3.5G with data plan
Light user	40%	20%	20%
Moderate user	25%	15%	10%
Heavy user	15%	10%	5%

For example, if you are buying a 3.5G smartphone with 300 hrs standby time, the phone will last 60 hrs for a light user but only 6 hrs for a heavy user. Therefore, it is unwise to buy LG KS500 if you are a heavy user unless you have access to a charging facility.

Therefore, you need to perform a match of your lifestyle with the RBL. Failing to perform this check may cost you dearly in buying an expensive phone that cannot keep up with your busy lifestyle. RBL is valuable more to a heavy user than a light user. Currently, Philip Xenium X500 offers up to 3600 hrs of standby time based on a 1720mAh battery. However, it is a simple 2G phone with no GPS, 3G and wifi features. If you are using purely voice call and SMS, you may like to consider buying Xenium X500 instead of a smartphone since it is tailored for your lifestyle.

Battery Maintenance

To prolong a battery life, you need to understand your battery. A lithium battery lasts for 500 charges so it is advisable to change your battery after every 2-3 years. It will permanently lose ~20% of its rated mAh after 400 charges. Although there is no memory effect for lithium battery, it is unwise to fully discharge unless the phone is not displaying the correct amount of energy. It is also unwise to charge your phone when you still have more than 50% battery life else you will use up the number of recharge. Therefore, charge your phone when the battery shows 1-2 bar.

If you have a spare battery, you need to use and charge it regularly because it will deteriorate if they are not in use. Having said that it is not advisable to get 2 batteries, why not get the best battery for the phone? For Motorola Q 9h, the standard battery is Li-Ion 1170 mAh. If there is a trade-off to get a 1300 mAh which is also supported by the phone, you have an improved battery.

Maintenance is also important to prevent the battery from exposing to extreme heat or overcharge for too long. These damages may be permanent on the battery lifetime. If it is too hot, battery may be malfunction. Therefore, it is unwise to charge them every day or exposing them to moisture environment. Insist on buying an original battery is also important to prevent circuit damage caused by the clone battery during charging.

Tips for the mobile phone

These are the usual tips recommended by reviews and popular websites:

1. Turn off your Bluetooth, GPS, Wifi and 3G after use;
   
2. Lower screen brightness and time;
   
3. Select a black or dark coloured theme;
   
4. Remove screensavers and animated wallpapers;
   
5. Switch off the phone when not in use;
   
6. Disable the number of applications in the phone especially the battery consuming ones;
   
7. Turn off the vibrating mode, keypad tones or ringtones;
   
8. Use a longer polling time for your mails;
   
9. Use less radio, camera, browsing, speaker and games and switch them off after using;
   
10. Switch to GSM mode instead of using 3G or 3.5G network. This is important for users who talk very often and sending a SMS does not require 3G at all;
    
11. Lower the volume of your speaker;
    
12. Avoid installing redundant or repeated applications with the same functions;
    
13. Update to the latest firmware with fixes on bugs; and
    
14. Install your critical programs into your phone memory instead of external memory cards. Remove your external card if possible to stop frequent access.
    

Even if you are not using any of the functions and switch your phone to offline mode, the real life idle time is still a fraction of the standby time provided by the specifications.

Signal Strengths

Depending on your location, signal strengths from base stations varies. If the phone is struggling to lock on to a network, it will use more power. It happens when places have weak signals, no signal or when you are underground. If you stay in these places for a prolong time period, it is advisable to switch the phone off since it has only 1 or 2 bar of signal strength. When you are moving and using the phone concurrently, moving from cell to cell requires the phone to negotiate between stations so it uses more power when you are mobile.

Useful S60 applications related to the battery

For Symbian smartphones, there are a few gems to have.

1. Nokia Energy Profiler or NEP (free) – provides a comprehensive result on the power consumption, current, voltage, CPU, signal strength, data traffic and estimated hour of idling time
   
2. Ravensoft Battery Extender – employs a few profiles to optimize the battery
   
3. Capree's iON Battery Timer – estimates the remaining time of the battery before it is flat
   
4. Alie Tan's ActiveFile – removes tasks which hoard power
   
5. Dr Jukka's Profile Scheduler (free) – switches to offline mode while not in use (flight or meeting)
   
6. Plan Task (free, www.opda.net.cn) – switches off and on the phone at specified timings (sleeping)
   
7. Mobisophy Technology's Interactive Voice Call Master – provides answering machine facility to save call out for voice mails when you have missed calls
   
8. Cclock (free) – enables the power saving mode with no screensaver.
   

Debugging the culprit

After you have applied the tips, your smartphone still cannot last for 12 hours, there must be something wrong with the phone, battery or software. If the battery depletes too fast or gets too hot while on use, it may be faulty and a change is necessary. If you have upgraded to the latest firmware and the problem persists, it is likely due to the applications running in the smartphone. Below is the debugging process.

For instance, my battery lasts run 20 hrs running applications with an average watt of 0.28W (Graph 1). If there is incoming or outgoing calls, the power consumption is higher driving battery life to only to 4:20 hrs of talktime based on 1.35W (Graph 2).

1. Switch off all unused functions in the phone (Bluetooth, GPS, Wifi etc)
   
2. Switch off all applications (Push mail, Battery monitoring softwares etc) except ActiveFile and NEP
   
3. Run ActiveFile first and take note of all the tasks running in the background (around 20).
   
4. Start NEP recording for 20-30 minutes.
   
5. Stop NEP and spikes are observed at 1.5 min intervals (Graph 3)
6. Spikes recorded during the process imply that some applications are running in the background.
   
7. List down the tasks. Some of the safe and common tasks are listed below. They are the safe list.
   
   1. DevEncstarter
      
   2. ActiveFile
      
   3. Anykey
      
   4. vcommandmanager
      
   5. Autolock
      
   6. SysAp
      
   7. aknnfysrv
      
   8. screensaver
      
   9. Telephone
      
   10. HomeScreen
       
   11. akncapserver
       
   12. essysapp
       
   13. LedController
       
8. Identify the unknown tasks and eliminate one task at a time (with application manager) and observe the graph in the NEP over 20-30 minutes
   
9. Take note of the deleted task which produces lower current and lower average power. If there is no change, repeat step (8) again and remove another task. (Graph 4 and 5)

   

   
   

   

10. Uninstall the identified task with the application manager.
    
11. Reboot the device and repeat step (1) to step (10) until graphs show that the current is 4-5 mA, CPU utilization at 1% and average power is 0.02W (Graph 6).

    

    At 0.02W with no spikes, the idle standby time is recorded as 273.22 hrs which is the best lifetime of the battery. It is still far from the specifications of 20 days or 480 hrs.
    
12. You have eliminated the resident programs which cause the high current consumption.
    
13. Now, reboot your phone and you should get an optimal battery life running all essential applications based on your lifestyle.

Below is the table for the standard 1500 mAh battery and the number of days the battery can last:

Average Watt - Number of day
0.250W - 1 day
0.125W - 2 days
0.0833W - 3 days
0.0625W - 4 days

So, if NEP shows that the average watt is 0.23, your phone will last slightly more than 1 day.

Conclusion

After running the exercise, your smartphone is performing at its peak with the best battery consumption. If it is still not satisfactory, I conclude either you buy the wrong phone, you like to torture the phone or your dream phone has not been produced yet.