Replacement Smartphone Batteries & Mobile Phone Batteries

subtel® - UK phone battery specialists since 2004

subtel® has been a trusted specialist for all types of batteries across Europe and the UK since 2004, offering the best, highest quality rechargeable, replacement smartphone batteries, mobile phone batteries and phone replacement parts for a huge variety of models and brands - for high-quality, high-capacity, long-life and reliable mobile phone battery replacements at affordable prices that are as good or better as your original phone battery.

If your original smartphone battery is losing power and no longer holding its charge, or you’re looking for a modern, Fast Charging and high capacity battery upgrade, subtel® will have the perfect, 100% compatible smartphone battery replacement for you.


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A huge selection of replacement phone batteries

subtel® sells a large selection of universal smartphone battery replacements, new batteries for phones and phone power banks include high performance, compatible replacement batteries for all leading smart phone types, brands and models.

These include replacement Samsung batteries, including Samsung Galaxy battery replacements, phone battery replacements for Nokia phones, replacement batteries for Apple smartphones including iPhone replacement batteries, HTC batteries, Sony Xperia batteries and many, many more. 

Many of our battery packs come with a smartphone tool box, containing all of the tools you’d need to replace the smartphone battery yourself.

Replace your battery, not your smartphone

Is your original smartphone battery no longer holding its charge? Don’t throw away your device - simply replace the battery. 

By exchanging your smartphone’s battery pack instead of buying a new one, you’ll save money over the long-term whilst also helping to reduce environmental waste. You’ll also be able to give your favourite smartphone a second life - good as new for years to come. 

The modern replacement smartphone batteries from subtel®’s brand, CELLONIC®, can also be higher-capacity, more powerful and with a longer lifespan than even the original batteries that came with your smartphone - for reliable power and fewer charging breaks.  

It’s often very simple to replace the battery of your smartphone yourself - all you need is a compatible replacement battery pack, a few good tools and an online tutorial or YouTube video.

Certified safety and proven quality

All subtel® and CELLONIC® batteries use the highest-quality cells: E & ROHS certified, Grade A battery cells with short-circuit, overheating and overvoltage protection that have been tested and certified for optimum capacity, reliability and safety – all before installation.

3-Year Manufacturer’s Warranty

Our Fast Charging, longlife mobile battery replacements stand for certified safety and high-quality standards. Because of this, we offer a 36-month guarantee on all of our batteries. 

How do you know when a smartphone battery needs replacing?

Most smartphones use rechargeable lithium-ion batteries. These types of batteries do wear out over time and will eventually need replacing. But, how do you know your smart phone battery is dying?

When you first bought your smartphone, the battery pack held probably around one day’s worth of charge before it needed to be recharged. 

If your smartphone’s battery life has become substantially shorter, you find yourself constantly needing to recharge your phone or even have it constantly plugged into the mains and charging for it to work, there’s a good chance that the problem lies with its battery.

However, before you decide to change the battery of your phone, it might be worth double-checking that the fault doesn’t lie with the charging cable you’re using. Experiment with another charger cable - if the problem still exists, it’s probably the battery.

What tools do you need to replace a smartphone battery?

Changing the battery of a smartphone is definitely something you can do at home, without needing any professional smartphone repair experience. 

And, if your smartphone battery has stopped working or quickly runs out of charge, you should do it - it’s definitely cheaper and more sustainable than buying a brand new smartphone. 

But, what tools would you need to do it?

Smartphone tool boxes come with an array of different tools to make opening up a smartphone and smartphone repair simple. Common tools you’ll find are:

  1. Mini screwdrivers. Different smartphones use different screws, and a tool set for smartphones will often contain a handful of mini screwdrivers - generally Torx screwdrivers and tri-wing screwdrivers.

  2. Anti-static tweezers to help you to remove and collect the tiny screws and other small components while protecting the delicate circuits and electronics within your smartphone.

  3. Spudgers and pry tools. As the cases of most smartphones are not only screwed together, but also fit tightly together anyway, you need to apply leverage to pry them open. Spudgers and pry tools come in numerous shapes and sizes but their main purpose is to get into the tight spaces between smartphone back and screen to enable the exertion of leverage to gently open the smartphone without damaging or scratching it. 

    Different spudgers and pry tools can also be used to gently loosen and remove internal components - such as batteries - from inside the smartphone.

  4. Suction cups for opening the mobile phone up. Once affixed to the screen and back of the smartphone, the suction cups allow you to exert even pressure when separating them - minimising the chance of any screen bending or potential damage. 

  5.  Adhesive tape or plaster to fix the new battery in place. 

Many of the smartphone batteries we sell at subtel® come with a smartphone tool kit included - featuring all of the tools you need to easily, safely and successfully change the battery in your smartphone. 

How do you change a smartphone battery?

Whilst DIY phone battery replacement is entirely possible - and will save you money over replacing the device completely, the process for removing and replacing mobile phone batteries greatly differs between brands and models. 

For example, how to replace a Samsung Galaxy battery will have a different process to installing a new iPhone battery. Not just that - the different generations of phones will also have different procedures.   

As a rule of thumb, it’s easier to replace the batteries of older phone models than newer ones. Older models had removable batteries - and changing the battery was as simple as taking the back off and swapping the batteries. If you have such a smartphone, you can stop reading this now.  

Now, more and more, smartphone brands are concealing the screws needed to open a phone up under panels held down by adhesive strips, and adhesive strips are also used to hold the phone’s hardware in place.

Work-arounds for these things include using heated pads to soften the glue, enabling you to get inside - but this all depends on the type of smartphone you’re trying to open up. 

A quick guide to replacing a smartphone battery

  1. Firstly, make sure your smartphone is fully switched off. Next: remove any small screws which may be holding the back of the smartphone together (check around the charging port).

  2. Using a pry tool or spudger to get between the screen and the back cover, apply gentle pressure around the gaps where the screen and cover meet - slowly and steadily turning the tool to avoid any damage to the clips holding them together.  

  3. Once you’ve loosened the back enough, separate it from the screen and put it to one side. Should the battery be covered by a piece of tape, use a pry tool to remove it.

  4. The battery should be connected to the smartphone via a ribbon cable (or perhaps multiple). Gently disconnect these cables using a pry tool (first removing any metal plates which might be holding the cables in place and paying attention to not damage the sockets), remove any screws which may be holding the battery in place and lift the battery out. 

  5. When unplugging any cables, keep in mind where they were - you’ll have to reattach them in exactly the same way with the new battery. 

  6. If the battery is affixed with an adhesive strip, you’ll need to use a pry tool to get underneath the battery and get it out.

  7. When fitting the new battery, simply repeat this process in reverse: place the new battery in place, replace the adhesive strips, reattach the cables, replace the screws, reapply the tape. 

  8. Align the screen with the back cover and gently snap the cover back in place - making sure that all sides and edges are securely back together. 

  9. Turn your phone on - does it work? If so, now you can fully charge it.   

Of course, if you are still unsure of how to change your smartphone’s battery, we recommend that you find a guide or YouTube tutorial for your specific model. 

How can you extend the life of your smartphone battery?

There are many tricks for extending the battery life of your smartphone whilst using it. 

These include lowering screen brightness to conserve energy, disabling background apps and freeing up hard drive space by deleting apps you find yourself not using, switching on any battery-saving modes your device may have, disabling GPS location settings and Bluetooth when you’re not using it and so on. 

But, how do you actually prolong the life of your smartphone battery? 

Having a smart charging routine can help increase the lifespan of batteries. The name of the game here is to not let your smartphone fully charge and discharge - e.g. going from 100% battery to 0% battery - on a regular basis. 

Instead, plugging your smartphone in to charge when it reaches 30-40% battery capacity and unplugging it when it reaches 80% could help maintain a healthy, long lasting charge, and never letting it drop below 20% could be a good rule of thumb

Following on from this rule, it’s best to not keep your smartphone plugged in all of the time. This includes overnight charging. Overcharging the battery (whilst also not practising a good, regular charging routine) can reduce a battery’s ability to hold charge.

Keep your smartphone cool - high temperatures and temperature fluctuations have a large, negative effect on the long-term performance and capacity of a smartphone battery. Avoid direct sunlight and sources of heat.   

Another option would be to simply upgrade the capacity of your smartphone’s battery. You could do this by buying a new smartphone battery which has a higher capacity than your existing battery and exchanging the batteries. 

The capacity of a battery is measured in mAh (milliamp hours) and the higher the mAh figure, the larger the capacity of the battery (meaning longer breaks in between charges). 

Replacement batteries for smartphones that have a higher mAh than the battery that  originally came with your smartphone are available (especially if your smartphone is older and technology has advanced) and subtel® sells a wide range of higher capacity, 100% compatible replacement batteries for smartphones. 

Reliable power when you need it

When looking for a replacement smartphone battery, choose a brand you can trust. 

subtel®’s CELLONIC® brand of designed-in-Germany battery cells use the best materials and technology to create high-end, heavy-duty, high-capacity, reliable and long-life batteries for all device types.

All mobile batteries ordered from subtel® are shipped within the UK from the day your purchase is made and come with a 3-year manufacturer’s warranty. If for whatever reason you’re unsatisfied with the quality of our batteries, you can return them within 30 days.