Does Fone4u offer a warranty on second-hand smartphones?

Yes, we offer a 12-month warranty on all second-hand mobiles, such as hardware and functionality issues not resulting from accidental damage.

Can I trade-in my old mobile phone with Fone4u?

Yes! Sell your mobile stress-free with Fone4u. Get a quote instantly on our Sell Your Phone page, and hand in or post your device for rapid payment.

Does Fone4u repair phones and tablets?

Yes, we have expert repairs for iPhones, Samsung, iPads, and more, including screen repair, battery issues, and diagnostic work.

We are located at Tolan Street, Ballina, Co. Mayo, F26 XT02, Ireland. You can also visit us at the Sligo Co. Sligo store or the Bray Co. Wicklow store for purchases, repairs, and trading in your devices.

How long is delivery when I shop online?

We provide next-day delivery throughout Ireland on orders received up to 1 PM. Delivery is usually 1-2 working days from your location.

Which payment options does Fone4u provide?

We provide all major credit and debit cards, PayPal, American Express, and in-store payments.

Are the second-hand phones unlocked?

Yes, all our second-hand phones are completely unlocked and ready for use with any Irish or foreign network.

What if I change my mind after I've bought?

We operate a 14-day money-back guarantee on online purchases. If you do change your mind, simply return the phone in its original condition for a refund or exchange.

Aaliya Yousaf
27 Jan, 2026

Sudden Battery Drops on iPhone? Here’s How to Fix It Without Buying a New Phone

Your iPhone is built to be powerful, fast, and reliable—although none of those things matter if the battery isn’t up to the task. If you notice your phone dying quickly or dropping from a charge of 40% to just 10%, or if you notice it acting sluggish when you’re using it normally, you may already know that the health of your battery isn’t what it used to be.

At Fone4U.ie, we assist iPhone users in learning about their iPhone battery condition even before it becomes a serious problem, particularly since the introduction of iOS 26, which requires even more power than ever.

The Hidden Cost of Ignoring Battery Health

In fact, many people using an iPhone think problems with batteries are issues that develop in the span of one overnight period. Yet, this is not true

In lithium-ion batteries, as time progresses, the chemicals in the battery gradually weaken its ability to retain a charge. Its failures include:

The battery percentage is spilling unpredictably
The mobile phone turns off when charged
Performance throttling when running resource-intensive applications
Long Charging Times and Heat Generation

If you fail to take note of such signs, it will decrease your cellular phone’s life span and value.

What Apple Doesn’t Tell You About Battery Capacity

According to Apple, the capacity level at which a given iPhone battery is considered “normal” is when it falls to less than 80%. But problems with the handset could arise much earlier, especially among those who use their phones for:

Navigation applications
Video Calls
Gaming or content creation
Mobile payments everyday

This is the reason why an expert battery analysis is always more informative than data shown on the screen.

How to Check iPhone Battery Health Yourself (Quick Guide)

Before visiting us, you can do a basic check:

Open Settings
Tap Battery
Select Battery Health & Charging

Look for:

Maximum Capacity (%)
Peak Performance Capability
Any warnings, such as “Service Recommended.”

If your battery is below 80% or showing warnings, it’s time for expert evaluation.

When a Professional Battery Health Check Is the Smart Choice

You should think about having a professional check if:

Your battery is being unusually drained

Your iPhone restarts with 20–30% charge left.

You are going to upgrade or trade in your phone.

You’re installing or updating to iOS 26

You want to avoid emergency shutdowns.

What Fone4U’s Battery Health Test Reveals

Unlike basic settings checks, our diagnostic process examines deeper performance indicators, including

Diagnostic Area	Why It Matters
Battery cycle count	Reveals real battery wear
Power stability	Detects shutdown risks
Charging efficiency	Identifies slow-charge causes
Physical battery condition	Detects swelling or damage
Board-level power flow	Rules out port or IC issues

You receive a clear explanation, not technical jargon—so you can decide what’s best for your device.

Same-Day iPhone Battery Replacement in Dublin

If replacement is advised, Fone4U.ie provides:

Same-day battery replacement
OEM-quality premium batteries
Highly trained technicians
There will be no loss of data in the replacement
Cost-effective alternative to buying a new phone

A replacement battery will frequently restore performance to almost new condition at a fraction of the cost.

Thinking of Upgrading Instead? Here’s the 2026 Advantage

If your iPhone is near the end of its lifecycle, it may be wiser to upgrade.

Exclusive 2026 Deal at Fone4U

Every phone sold in 2026 has an 18-MONTH WARRANTY
Applies to new & certified pre-owned phones
Covers peace of mind beyond standard warranties
Limited to 2026 only—must be availed before the offer ends

Our team will help you decide on either replacing the battery or upgrading, which gives better long-term value

Why Dublin Customers Choose Fone4U.ie

Walk-in service—no appointment necessary

Honest diagnostics & transparent pricing

More expert advice (repair vs. upgrade)

Trade-in options available

Reliable local phone experts

We pride ourselves on doing work that benefits you, not a load of unnecessary repairs.

Get Your iPhone Ready for iOS 26—Without Battery Anxiety

A poor battery can spoil your experience with an iPhone. Need a health check done quickly or a same-day battery replacement service done on the day you want it done? Whatever the requirement is, Fone4U.ie is there for all kinds of assistance.

Call into our Dublin store today

Phone us for a battery check or quote/estimation

You can use your iPhone with confidence—every day

Walk-in service requires no appointment

Honesty about Diagnoses & Prices

Specialist advice (repair vs. upgrade)

Available Trade-in Options

Experienced local phone technicians

Frequently Asked Questions

Yes. iOS 26 introduces enhanced background processes, AI-related enhancements, and higher system performance requirements. Most older iPhone models have low battery life; the new iOS upgrade may lead to faster battery drain, slowness, or even random restarts, making a battery health check a strongly recommended process before the upgrade.

Over time, yes. A dying battery can cause voltage issues, which can impact the logic board, charging port, and overall functionality. It is easier and less costly to fix battery problems early on.

In this case, a charge level below 80% causes performance throttling, sudden shutdowns, and reliability problems, especially when making calls, using the navigation system, or making mobile payments. However, it is generally safe to use.

For best performance, it is advised to check the battery health of the iPhone every year or if there is any unusual usage, such as rapid draining, overheating, or sudden restarts.

Yes. Using low-quality chargers can lead to the battery deteriorating quickly and can also cause the battery to heat up. It is advised to use high-quality chargers, such as Apple-approved chargers, to extend the life of the battery.

In most cases, yes. When a degraded battery is replaced, iOS no longer constrains performance in an attempt to prevent shutdowns.

Absolutely. Fone4U accepts iPhones with battery issues. However, if you replace the battery before trading it in, you might get a higher trade-in value. Our team will assist you in determining which option is best for you.

Your data remains completely safe. Battery replacement does not erase any data. Still, we recommend backing up your iPhone as a general precaution.

Yes. All battery replacements are guaranteed at Fone4U.ie. This means that you can be assured of performance and quality.

The most suitable course of action depends on the age of your iPhone. If your iPhone is relatively new, the best value for money would be to change the battery. But if your iPhone is an older model, an upgrade might be the best course of action, considering the 18-month warranty that Fone4U provides for the purchase of phones in 2026.

The 18-month warranty covers defects in manufacturing and hardware issues for new and certified pre-owned smartphones. This is an exclusive offer that is only valid for purchases made in 2026.

No appointment is needed. Fone4U.ie operates a walk-in service at our Dublin store, providing quick diagnosis and same-day repair whenever possible.