I have been repairing the iPhone 4 and 4S since they were first released. These models represent an iconic era of design, featuring a glass back panel that slides upwards to reveal the internals. Over the years, original batteries chemically degrade, sometimes even swelling up and pushing the rear glass away from the metal frame. Before booking a repair, I always recommend a simple software check: navigate to Settings > General > Reset > Reset All Settings. Sometimes, a rogue legacy app running in the background causes rapid drain. If this doesn't solve it, the hardware has chemically expired. We will safely remove the old cell, clean the contacts, and fit a new premium battery to ensure your device functions perfectly once again. For official battery guidance, you can view Apple Support.

Every vintage battery replacement is backed by our comprehensive 1-year Return To Base warranty, covering you against manufacturing defects or sudden power drops. Our £29.99 repair process is careful and precise:

• Safe Housing Entry: We remove the dual pentalobe screws at the base and carefully slide the rear glass panel upward to expose the internal logic board.
• Component Extraction: We unscrew the battery connector bracket, gently unseat the ribbon cable from the motherboard, and safely lift out the chemically degraded or swollen cell.
• New Battery Installation: We install a high-quality, fully tested replacement battery that matches or exceeds the original factory specifications, securing it firmly before resealing the glass backing.

Your photos, music, and personal data remain entirely secure on your flash memory during this hardware swap.

We provide professional lithium-ion battery replacements for the following legacy Apple iPhone models:

• iPhone 4 Battery Replacement
• iPhone 4S High-Capacity Cell
• Swollen Battery Extraction
• Random Shut-down Fixes
• Rapid Draining Diagnostics
• Safe Lithium Disposal

⭐ "a very good experience"
"Pleased to say I have just had a very good experience with my 8-year-old Macbook. I needed a new battery but Danny was also able to repair a sticking key and clean the unit - which was fortunate as he found a vent was blocked with accumulated..." — Hedley Basford

⭐ "all sorted in 15minutes"
"Great service. I had a non responsive laptop that I needed to access quickly. I rang up, popped in and it was all sorted in 15minutes. They were very friendly and helpful, I would definitely recommend." — Jon Starck

⭐ "resolved in just a few minutes"
"We had a few problems when changing over a phone so took it into the shop for assistance. The shop assistant was so helpful on both occasions and the problem was resolved in just a few minutes - brilliant." — PAULINE WITCHELL

1. 1. Free Label: Receive a pre-paid Royal Mail tracked label via email after checkout.
2. 2. Safe Shipping: Drop your securely packed iPhone at any UK Post Office.
3. 3. Fast Return: Repaired in our workshop and returned via tracked delivery, usually within 3-5 working days.

Is it worth replacing the battery in an iPhone 4 or 4S?
Absolutely. Many people still use these rugged, classic devices as dedicated iPods, backup emergency phones, or for specific legacy apps. For just £29.99, a new battery breathes years of life back into the hardware, making it a highly economical choice.

Why does my iPhone 4 die when it still says 30%?
This is a classic sign of severe chemical degradation. Over years of use, the lithium-ion cells lose their ability to report accurate voltage to the logic board, causing unexpected shutdowns when the processor demands sudden power. A £29.99 replacement fixes this instantly.

Can a swollen battery damage my phone?
Yes. If the internal cell swells up, it pushes aggressively against the rear glass panel and the internal motherboard. If left unchecked, it can crack the glass or fracture the logic board. It is crucial to have swollen batteries safely removed and properly disposed of.

How long does an iPhone 4 battery replacement take?
If you visit our Canterbury shop, we can frequently perform the replacement while you wait. For UK postal orders, we aim to have the device repaired, fully cycle-tested, and dispatched back to you within 3 to 5 working days of it arriving at our lab.

How much does it cost to fix an iPhone 4S battery in the UK?
At Atlantis in Canterbury, we offer a highly competitive fixed price of £29.99. This encompasses a premium high-capacity replacement cell, expert installation by trained technicians, and free UK-wide tracked return postage.

Can I replace an iPhone 4 battery myself?
While the iPhone 4 is easier to open than modern devices, removing the internal battery connector without the correct anti-static spudgers can easily rip the tiny logic board components right off the motherboard, permanently destroying the phone. Professional installation is always recommended.

Where can I get an iPhone 4 fixed in Kent?
Atlantis, located at 155 Wincheap in Canterbury, provides expert hardware restoration for the entire legacy iPhone range. We offer rapid walk-in services for local customers and a highly secure, free postal service covering the whole of the UK.