The Key Takeaways

Three things to hold in your head before you spend £800 you don’t need to spend.

• Your iPhone isn’t slow — your battery is tired. iOS throttles CPU performance when battery health drops below ~80%. Replace it and the “slowness” vanishes.
• A battery swap costs roughly 8% of a new iPhone. Two extra years of phone life for the price of a weekend meal out.
• Mend My iPhone is 5 minutes from South Cave, 10 from Beverley, 15 from Pocklington — and an hour closer than the nearest Apple Store in Leeds.

The Conversation We Have Six Times a Week

A real exchange from our shop (custard creams received).

Nine times out of ten, the customer walks out an hour later genuinely shocked their phone feels “like new.” The tenth one still wants an iPhone 17 — fair, we don’t twist arms. But most people had no idea the phone they were about to bin was going to cost them £800+ to replace a part worth a fraction of that.

Your iPhone Isn’t Dying. It’s Just Thirsty.

A quick explainer of why old iPhones feel slow — and why the fix is a battery, not a whole phone.

Lithium-ion batteries are the Hobnobs of the phone world. Crunchy and brilliant at first, but put them through enough cups of tea — that’s charge cycles — and they go soft. That’s not a defect. That’s chemistry.

Apple publishes this, but they bury it on page 4 of a support document: an iPhone battery is designed to hold about 80% of its original capacity after 500 full charge cycles. If you charge every night, that’s roughly 18 months to 2 years. After that, the battery holds less, drains faster, and here’s the part nobody mentions: iOS starts slowing the phone down on purpose.

It’s why your three-year-old iPhone feels laggy opening the camera. It’s not the chip. The A15 in an iPhone 13 can still edit 4K video. It’s the phone telling itself: “I can’t ask for a burst of power — the battery will brown-out and the phone will crash.” So it runs in low-power mode permanently.

Change the battery. The throttling stops. The phone wakes up. You don’t need a new iPhone — you need a new heart for the one you’ve got.

The Maths Nobody Does

We’ll do the thing most customers don’t. Actual numbers.

Look at the last column. That’s the “true” cost. A new iPhone costs you £200 a year in ownership. A battery replacement at Mend My iPhone costs you £28 a year. That’s a Freddo a day versus a coffee every day.

If you’re worried about “but the new one has better cameras” — fair. But ask yourself honestly: when was the last time you looked at a photo from 2023 and thought “wow, this needs better bokeh”? The camera on your iPhone 12 or 13 already takes better photos than the £500 DSLR you had in 2015.

Is It Actually the Battery?

Not every slow iPhone is a battery issue. Try these 30-second checks first.

1. Settings → Battery → Battery Health. If Maximum Capacity is below 85%, it’s the battery. Stop reading and book us.
2. Check your storage. Settings → General → iPhone Storage. If you’re over 95% full, clear photos to iCloud first.
3. Restart the phone. Hold power + volume down. Yes, it’s the IT Crowd answer. Yes, it fixes 30% of “slow phone” complaints for free.

If the slowness and poor battery life persist after those three, it’s almost certainly the battery. Come and see us.

Real Chat: “I Was About to Buy an iPhone 17”

Sarah from Beverley, messaging us last month.

Sarah left with an iPhone that felt new. She messaged three weeks later to say it was lasting “all day, and it’s fast again.” Total cost: one battery. Savings: a holiday.

Market Weighton vs The Apple Store in Leeds

An honest side-by-side. The nearest Apple Store is 52 miles away.

Which iPhones We Replace Batteries For

All of them. Most common models we see right now:

• iPhone 11 / 11 Pro / 11 Pro Max — still brilliant phones, just thirsty
• iPhone 12 / 12 Mini / 12 Pro / 12 Pro Max — the sweet spot for keep-vs-replace
• iPhone 13 / 13 Mini / 13 Pro / 13 Pro Max — newest model we see in regularly
• iPhone 14 / 14 Plus / 14 Pro / 14 Pro Max — early adopters hitting the throttle point
• iPhone 15 / 15 Plus / 15 Pro / 15 Pro Max — first batch now due
• iPhone SE (all generations) — smaller battery, degrades fastest
• iPhone X / XS / XR and earlier — yes, we still do these

Why Choose Mend My iPhone

One specialist. One focus. Getting your iPhone right first time.

Areas We Cover

Frequently Asked Questions — iPhone Battery

Everything you need to know before booking your iPhone battery replacement.