How to fix iPhone battery shutting off in cold

Do you have an iPhone that battery randomly shuts off in the cold?




  • This is a common problem faced by many users with batteries in the colder climates.


The iPhone Battery

All iPhones use a type of battery called Lithium-Ion (sometimes abbreviated Li-ion). This is the most common battery technology found in rechargeable devices.

Li-ion batteries carry certain advantages – they charge fairly quickly and don’t need to be completely depleted before recharging (in fact, it’s better to recharge at 20% then waiting for your phone to die). Unfortunately, these batteries don’t do so well when the temperature outside drops.


Lithium-Ion batteries suffer in extreme cold temperatures:

According to Battery University, cold temperature “increases the internal resistance and diminishes the capacity” of a Li-ion battery. Specifically, they estimate that at -18 degrees Celcius a Li-ion may only deliver 50% of its capacity.

During last winter’s Polar Vortex, Global news did an experiment which showed an iPhone left outside dropped 14% in only 30 minutes, while an identical phone left inside dropped only 1%.




Apple specifies that their batteries work best at a range of 0 degrees Celsius to 35 degrees Celsius. While we almost never reach the upper range in Canada, temperatures below freezing are typical for the winer months.

 Because the battery meter is calibrated assuming warmer temperatures, the reduced capacity in the cold can cause the reading to be unreliable. This is one of the reasons your phone may die while still showing 30%.


All cell phones use Lithium-Ion batteries and as such as subject to this problem. This issue is also exacerbated when the battery itself has been used for a great deal of time (>1yr) and is already week due to the high cycle counts incurred from multiple charges.


The best thing to do when the battery is older is to get it replaced which is a quick and easy repair provided by the technicans working at Wires Computing. Most battery replacements for iphones and other devices are less than $65 and take only about 15-20mins to replace and test.


External USB Battery


  • If you would rather use an external battery pack to charge your phone be sure to check out our selection of: external usb battery packs



Stop by today to get your battery life back to normal!


Also see: iPhone Swollen Battery Fix


What is a Sim Card?

A Sim card or also known as a Subscriber Identity Module is found in almost all mobile devices which have the capability of mobile wireless service for data and/or calls via a wireless company carrier such as AT&T, T-Mobile, H2O, Net10


 Contrary to popular belief, sim cards contain very little [if any] user saved data. The main purpose of a sim card to to authenticate your device onto the network of choice and facilitate wireless transfers to and from your device to the wireless towers in the form of data and/or voice calls.


A SIM card contains its unique serial number (ICCID), international mobile subscriber identity (IMSI) number, security authentication and ciphering information, temporary information related to the local network (MCC-MNC), a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking code (PUK) for PIN unlocking.


  • The use of SIM cards is required in GSM Devices



Sim Card Cross Section


SIM cards store network-specific information used to authenticate and identify subscribers on the network. The most important of these are the ICCID, IMSI, Authentication Key (Ki), Local Area Identity (LAI) and Operator-Specific Emergency Number. The SIM also stores other carrier-specific data such as the SMSC (Short Message Service Center) number, Service Provider Name (SPN), Service Dialing Numbers (SDN), Advice-Of-Charge parameters and Value Added Service (VAS) applications.

SIM cards can come in various data capacities, from 8 KB to at least 256 KB. All allow a maximum of 250 contacts to be stored on the SIM, but while the 32 KB has room for 33 Mobile Network Codes (MNCs) or "network identifiers", the 64 KB version has room for 80 MNCs. This is used by network operators to store information on preferred networks, mostly used when the SIM is not in its home network but is roaming. The network operator that issued the SIM card can use this to have a phone connect to a preferred network, in order to make use of the best commercial agreement for the original network company instead of having to pay the network operator that the phone 'saw' first. This does not mean that a phone containing this SIM card can connect to a maximum of only 33 or 80 networks, but it means that the SIM card issuer can specify only up to that number of preferred networks; if a SIM is outside these preferred networks it will use the first or best available network.



Sim Card Sizes


An integrated circuit that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers). It is also possible to store contact information on many SIM cards. SIM cards are always used on GSM phones; for CDMA phones, they are only needed for newer LTE-capable handsets. SIM cards can also be used in satellite phones.


The SIM card introduced a new and significant business opportunity for MVNOs — mobile virtual network operators — who lease capacity from one of the network operators rather than owning or operating a cellular telecoms network, and only provide a SIM card to their customers. MVNOs first appeared in Denmark, Hong Kong, Finland and the UK. Today they exist in over 50 countries, including most of Europe, United States, Canada, Mexico, Australia and parts of Asia, and account for approximately 10% of all mobile phone subscribers around the world.

On some networks, the mobile phone is locked to its carrier SIM card, meaning that the phone only works with SIM cards from the specific carrier. This is more common in markets where mobile phones are heavily subsidised by the carriers, and the business model depends on the customer staying with the service provider for a minimum term (typically 12, 18 or 24 months). SIM cards that are issued by providers with an associated contract are called SIM only deals. Common examples are the GSM networks in the United States, Canada, Australia, the UK and Poland. Many businesses offer the ability to remove the SIM lock from a phone, effectively making it possible to then use the phone on any network by inserting a different SIM card. Mostly, GSM and 3G mobile handsets can easily be unlocked and used on any suitable network with any SIM card.

In countries where the phones are not subsidised, e.g., India, Israel and Belgium, all phones are unlocked. Where the phone is not locked to its SIM card, the users can easily switch networks by simply replacing the SIM card of one network with that of another while using only one phone. This is typical, for example, among users who may want to optimise their carrier's traffic by different tariffs to different friends on different networks, or when traveling internationally.

In 2016, carriers started using the concept of automatic SIM reactivation whereby they let users reuse expired SIM cards instead of purchasing new ones when they wish to re-subscribe to that operator. This is particularly useful in countries where prepaid calls dominate and where competition drives high churn rates, as users had to return to a carrier shop to purchase a new SIM each time they wanted to churn back to an operator.



iPhone Battery Swollen Fix

Do you have an iPhone 5, 5C or iPhone 6 that has decreased battery life and is now puffy and swollen to the point it has pushed your screen out and even cracked it?



This is a typical issue faced with mobile devices that have lithom ion polymer batteries.

Every iPhone device has a Li-ion battery inside and eventually it will need to be replaced. Typically most batteries are only rated at about 600-700 charge cycles, after or even before this time the battey life will be much shorter then it used to be. It may also get a bit warm as the cells inside the battery wear out.

A cycle is considered when a charge from <5% - 100%

Occassionly when the cells get worn out from so many charge and discharge cycles it can swell up in the phone causing it to damage or even crack the screen.


Unfortunately when this happends, not only does the battery need to be replaced, but the lcd screen assembly as well. When the screen is being pushed out it will crack and ruin the sensitive under part of the screen which can often result in no image on the device also.


If you need a battery replacement on your mobile device or iPhone, be sure to contact us today for this repair which takes no more then 30mins. No appointments are needed and we stock many iphone and batteries in house to allow for fast repairs!



iPhone 6 Long Screw Damage

During the disassembly process of the iPhone 6 you remove a plate with 5 screws holding the Digitizer, LCD, Front Camera Flex, and Home Button Flex to the board. During this process it is very important to keep the screws in the right spot that they were removed from.




The top 2 screws (shown in orange and yellow) screw into the frame and/or stand-off screws. The 3 screws in the bottom triangle are sitting atop the motherboard milimeters above very tiny traces that can be breached if a longer screw is used, hence the name "long screw damage". This is often caused by in-experienced technicians and/or Do-It-Yourselfers who failed to accurately keep track of the screws.

When this type of damage is done, the only method to repair the phone is micro soldering with a microscope. It is very signifigant and often times can completly ruin the phone. The symptoms of this damage is often: blue screen on start up, red screen on boot, no backlight, no image on boot, phone still vibrates but no image on screen.

After dissassembling the device and inspecting the screw posts under a microscope we can see the long screw has breached the motherboard on the bottom left screw.




  • After spending some time carefully removing the screw post we can inspect and see that 3 traces have been cut short and no longer connect. 
  • During this repair the person working to resolve the issue needs to mind the thicker traces that have vias which go between the board layers, also separating the ground planes near other circuits.





  • In order to repair this, very tiny jumpers thinner then human hair are needed
  • You will also need ZXW Tools USB dongle to find the correct traces and repair the cuts



After the repair is performed you can see the very delicate jumpers that connect the traces to each other to allow the signals to flow between components. 

This repair is very complex and does not always end up with success. Next time you want to save a few dollars on a repair by trying to replace a cracked iphone 6 screen yourself, stop and take it to the professionals first. This repair starts at $145 and this does not include the screen repair. When a screen repair would have only been $115 for 30mins, this repair would end up costing about $200 and 3-4 business days for testing and repair. 

For this or any other repair you may need, be sure to check us out: Wires Computing

See all the services we offer at Micro Soldering Repairs


Samsung Galaxy Repair Services

Samsung Galaxy Repair Services by Wires Computing

Wires Computing offers many repairs services such as samsung galaxy repairs

  • Samsung Galaxy Series Cracked Screen Repairs
  • Samsung Galaxy Series Charger Port Repairs
  • Samsung Galaxy Series Back Cover Replacements
  • Samsung Galaxy Series Camera Repairs
  • Samsung Galaxy Series Battery Replacements
  • Samsung Galaxy Series Water Damamge Repairs



We repair all devices such as Samsung Galaxy s4, s5, s6, s7 & edge series

Samsung Galaxy Note Repairs


Stop by Wires Computing located at: 383 College St. Burlington, VT 05401

No Appointments needed!

Repair shop Open Mon-Fri 3pm-8pm

Saturday 12pm-6pm