Smartphone battery life explained:
As
many will know my Samsung S2 battery life article has become quite the
flag bearer for mobile inquirer, unfortunately it has taken me a while
to get around to writing the follow-up up that aims to help owners of
smartphones with their battery life issues…instead of just moaning..;)
So here it is, the definitive guide and resource to learning more about your smartphone battery and improving it’s life:
Smartphone Battery Life Guide
I
am going to cover myths of battery life on smartphones, and ways you
can help prolong the battery life of your device in general:
Firstly
I have to tell you what battery we are talking about when it comes to
the power source that is actually inside your smartphone:
Li-ion smartphone battery: Your
smartphone invariably makes use of a rather amazing bit of kit called a
Lithium-ion type battery, with my Samsung S2 taking a Li-ion 1850mAh
Rogers Model with a 1650mAh model also being offered for this device.
Your smartphone probably uses something similar.
The
problem that many are facing, is that the power demanded from your
smartphone is not yet matched by the power offered from your battery,
and this causes obvious issues, not least of which in Apple’s case is
you can not actually replace the battery, so if it runs out during your
day, which they so often do, you pretty much have no choice but to stop
and recharge.
And so it has to be said that at least in devices
where you can replace the battery, you can currently own two or more
spares, to get you through a little longer.
The smartphone battery test: This
test was carried out in 2010 by batteryuniversity.com and is a thorough
analysis of how a pool of batteries degrades over time under certain
conditions.
The pool of brand new 1500mA Li-ion batteries for
smartphones were tested on a Cadex C7400 battery analyzer. These 11
pouch packs, started with a capacity range of 88–94 percent, they then
decreased in capacity to around 73–84 percent after 250 full discharge
cycles (2010).
Here are some of the key findings from the fairly technical report:
It
has to be said that they were seemingly testing for the life of the
battery and it is slightly configuring as to if they refer to the life
of a charge or the life of the battery over months…i.e how much it
degrades over time, either way some truths are still contained that we
should all really know about.
Similar to a mechanical device that
wears out faster with heavy use, so also does the depth of discharge
(DoD) determine the cycle count. The smaller the depth of discharge, the
longer the battery will last. If at all possible, avoid frequent full
discharges and charge more often between uses.
This above quote
dispels most commonly held views that you should let your smartphone
battery fully charge down when you first get your phone, and then charge
it all the way back up, and keep doing this through the lifetime of
your phones battery.
Myth number 1 – Memory effect:
“Memory
effect” caused some rechargeable batteries to lose maximum charge
capacity unless they were fully drained before recharging, this effect
does not occur with smartphone batteries and the chart below shows that
for optimum life of a smartphone battery, they are best kept charged and
not allowed to drop to fully empty that often.
Here is a chart
showing that if you were able to keep your phone charged at around 40%
all the time instead of going from full to empty as many owners do, your
overall battery capacity would not degrade at such a level.
Smartphone Battery Life
Myth number 2 – Priming batteries: This
was also necessary for some (ones that did not have it done at the
factory) Nickel Cadmium (NiCd) and Nickel Metal Hydrate (NiMH) batteries
which needed to be “primed” in order to ensure that the worked ot their
fullest, thsi meant that you needed to initially run the battery dead
before charging it up.
Li-ion in general (including Li-ion Polymers) do not need priming.
Myth number 3 – Temperature: Gone
are the days of putting your battery in the fridge or in the the sun to
get a little more juice out of your smartphone, and is totally
impractical anyway.
Your smartphone battery will nowadays most
likely prefer to be kept at around 20 degrees Celsius, this means that
recharging using a wireless mat for instance will not probably help the
battery stay in its prime condition as the energy lost in the exchange
is transferred into heat and will actually cause the battery to
unnecessarily raise in temperature overall, and looking at “scientific”
data, this would lead me to conclude that a degradation would occur
which may not have happened if you used a conventional lead based
method.
Exposing the battery to high temperature and being at
full state-of-charge for an extended time can be more damaging than
cycling. Newer designs may show improved results.
Apps to help battery life: Well
one way maybe to actually kill your apps in all honesty, using your
task killer options where available, however there are rumours to be
some application options that
may help to improve your battery life.
For the iPhone you have:
Battery Doctor
And for Android you have:
Juice Defender
I
have no idea whatsoever if these work well or not, I have trialled the
free version of Juice Defender to improve my own Samsung S2 battery
problems but I found it to be quite complicated and unsure it did
anything much after trialling for a few days on various settings, but
maybe the pro version is better.
Accessories to help smartphone battery life: We covered this model in our top 5 iPad accessories list, so here it is again.
The New Trent iCruiser IMP1000 11000mAh External Battery Pack, which will give you a charger on the go.
This nifty device is really worth checking out especially if you like camping etc.
Methods you can utilise day to day to extend battery life: There
are some every day lessons to be practised that many people may not
know about and should help you obtain better battery life in general and
will work for most smartphones.
- Keep your background image simple
- Underclock your phone’s CPU
- Disable GPS / Bluetooth
- Force a 2G or 3G signal do not make your device keep switching
- Reduce widgets on your home screen
- Minimize auto sync features
- Reduce screen brightness
*In
all honesty some of the above areas that I mentioned could do with
fleshing out a bit, as some points are not that obvious to accomplish
for the average user.
Innovations that could be considered to save battery life: Here I want to take a look at some areas that could be developed that would help bring about battery life improvements:
Cloud based technology for content delivery: More
and more cloud based applications like Onlive are now taking some of
the heat off our smartphones processors, by doing the calculations in
the cloud and sending a compressed stream to decode on our phones, this
method allows extremely high quality gaming to be seen on smartphones
and mobile devices, I think that GPS would benefit from improvements
here.
Hot Swapping One inventor called Ric Richardson’s has
produced, what he calls, “hotswap” batteries for laptops, these new
batteries allow you to take one battery out and replace them with
another without having to turn the device off and create a 2-5 minute
delay, this would be very useful for mobile devices such as smartphones,
in particular, if you were in the middle of a very important call, or
raging inferno and needed help!
Graphene Another great invention
appears to come from a group of engineers at Northwestern University,
Professor Harold Kung, has found a way of improving smartphone battery
life by a factor of ten by using layers of perforated Graphene as a
material between the lithium ions, that is said to aid their transfer
and speed charge times up. The team also went on to add silicon in to
this layer which aided capacity, Professor Kung went on to say:
“We
have much higher energy density because of the silicon, and the
sandwiching reduces the capacity loss caused by the silicon expanding
and contracting. Even if the silicon clusters break up, the silicon
won’t be lost.”
So here we have speed of battery charge improved
by factors of up to ten, and capacity improved by the same, meaning that
we could very well have the solution to all our battery woes in the
form of Graphene.