Direct answer: Xiaomi battery replacement in the UK runs from £39.95 for the budget Redmi A-series up to £99.95 for a Mix Fold 4, with Xiaomi flagships around £69.95–£84.95 and the Redmi Note line £39.95–£54.95. Redmi's large-capacity cells are a known degrade point over two to three years. Every figure here is fixed, and each replacement is backed by a 27-month guarantee.
Xiaomi-family phones — the Redmi line especially — are built around large-capacity batteries, which is a gift to run-time but a magnifying glass when the cell ages: the same generous pack that once pushed a Redmi Note through two days barely limps to one, and the drop is impossible not to notice. A couple of years in, that fading pack is the single biggest reason a Redmi leaves its owner's pocket, and it is also one of the lowest-priced faults on any phone to put right. The exact fitted price across Xiaomi, Redmi and Poco, the symptoms that flag a worn cell, and the OEM-grade-versus-aftermarket call are below. See the full Xiaomi repair cost UK hub for the wider picture.
Battery replacement prices for Xiaomi, Redmi & Poco
| Model | Battery replacement (fitted) |
|---|---|
| Xiaomi 14 Ultra | £84.95 |
| Xiaomi 14 Pro / 13 Ultra | £79.95 |
| Xiaomi 14 / 13 Pro | £74.95 |
| Xiaomi 13 / 12 Pro | £69.95 |
| Redmi Note 14 Pro+ / Pro | £49.95–£54.95 |
| Redmi Note 14 / 13 | £44.95 |
| Redmi Note 13 Pro / 12 Pro | £39.95–£44.95 |
| Redmi Note 12 / 11 | £39.95 |
| Poco F6 Pro / F6 | £59.95–£64.95 |
| Poco X6 / X5 | £49.95–£54.95 |
| Redmi 14C / 13C / 13 / 12 | £39.95 |
| Redmi A3 / A2 | £39.95 |
Standard repairs include diagnostics. Every cell carries the 27-month warranty tier.
Why large-battery Redmi models degrade
Redmi Note models are sold on big-capacity cells (often 5,000mAh and up). A larger cell does not degrade any faster per cycle, but because the phone is marketed on multi-day run-time, the same percentage loss is more visible — a Redmi Note that has lost 20% of its capacity is far more noticeable than a small-battery phone with the same loss. The practical effect is that Redmi owners feel battery ageing keenly, and a replacement restores the headline run-time.
Signs your Xiaomi battery needs replacing
- A multi-day Redmi now barely sees out one. When a big cell loses capacity the drop is dramatic, because the phone was sold on the run-time that capacity bought.
- It powers off with charge still showing — 20% or more. A fatigued cell cannot hold its voltage when the phone draws hard, so it cuts out early.
- The rear panel is no longer flush. A lifting back signals a swelling cell; stop charging and using the phone and send it in.
- It gets hot on HyperCharge. Some warmth is normal at high wattage, but a cell that runs notably hotter than it used to is tiring.
Battery cell quality
On a Xiaomi-family phone the cell grade matters more than on most, because a Redmi's entire pitch is endurance — and a bargain cell quietly claiming a capacity it cannot deliver hollows that pitch out within months. We fit OEM-grade, cycle-rated cells matched to the original capacity so the headline run-time actually returns. If a cell is not one we would happily live with in our own phones, it does not go into yours. See our parts-grade guide.
Is battery replacement worth it?
Nearly always. A Redmi or Poco is usually a sound, capable phone held back by nothing but a worn cell, and a £39.95–£54.95 battery brings its full run-time back for a fraction of a replacement. The Xiaomi flagships and Mix foldables keep enough value that a cell swap still wins out, with the 27-month guarantee behind it.
Battery replacement by post
Book at /repair/phone/xiaomi, choose a suitable tracked delivery service and follow the order instructions. Standard battery repairs include diagnostics, the price is confirmed before work begins, and return delivery follows the order terms. Our Xiaomi repair by post guide covers the process, and our common Xiaomi & Redmi faults page covers other faults.
If posting a Mix Fold or Mix Flip, pad it so it cannot fold or shift, protecting the inner display and hinge.
What a Xiaomi-family battery replacement involves
A Xiaomi, Redmi or Poco battery swap is rear-entry work, but “the back” means something different on each branch of this sprawling family — and the differences bear directly on the large Redmi packs this page is really about.
Opening the back — three different rear assemblies
Everything in the range is sealed with a perimeter adhesive bead, so the rear comes up to temperature on a heated platen first. A budget Redmi A or C wears a plastic back that peels away cleanly the moment the glue lets go. A Xiaomi 13 or 14 Pro carries glass bonded to the frame that must be eased off evenly on picks — the Leica-edition backs are especially brittle and crack if the pressure is uneven. The Mix Fold and Mix Flip fold the problem in half again, with a hinge and twin cells that the opening has to work around. That spread of rear assemblies is a good part of why a battery runs from £39.95 on a Redmi A to £99.95 on a Mix Fold 4.
Lifting and swapping the large Redmi cell
Once the back is clear, the old pack is unplugged and its adhesive softened with heat rather than levered up. This is the careful part on the big Redmi Note cells: a larger pack that has begun to fatigue is more prone to puncture, so the glue is warmed through and the cell eased out flat rather than prised. A cycle-rated, OEM-grade replacement matched to the original capacity goes in, is reconnected and secured, and the perimeter seal is laid back down on reassembly. Skimp on the cell here and the failure is pointed: it cannot deliver the endurance the whole Redmi Note idea rests on, it warms up under HyperCharge, and it sags within months.
Testing before return
Before return, the new cell is capacity-checked, its charging monitored, and the phone tested under load. If the original symptom remains, the battery may not have been the root cause; this is why diagnostics come first. Standard battery repairs include diagnostics, while any specialist terms are confirmed before work. The grade reasoning sits on our OEM vs aftermarket vs genuine parts page.
How Xiaomi battery pricing compares
Xiaomi's battery ladder is unusually wide because one family runs from a budget Redmi A to a Mix foldable, which means its floor is among the lowest in the Android market and its ceiling is among the highest. Placing it next to its siblings makes the value clear.
- Against OnePlus. OnePlus has no true budget tier, so its battery floor is higher; its flagships compare with Xiaomi's, and SuperVOOC ageing is the parallel of HyperCharge ageing. See our OnePlus battery replacement page.
- Against Nothing. Nothing Phone is a single flagship line, so its battery pricing clusters higher than the Redmi volume line. Compare it on our Nothing Phone battery replacement page.
- Against Samsung. The Galaxy range climbs the same way on battery pricing, A-series up to flagship. The Samsung repair cost hub has the detail.
The honest read: the Redmi and Poco end of the family is where battery replacement delivers the best value in the UK Android market, because the parts are plentiful and the phones are otherwise sound. The whole-market view sits on our Android repair cost hub.
Replace the battery, or replace the phone?
Renew the cell, in almost every case. A Redmi, a Poco or a mid-range Xiaomi whose only weakness is a tired pack is precisely the phone that gains most from the job — a battery at the prices above restores full run-time for a fraction of a new device, with 27 months of cover behind it set out in the published Celltech terms. The flagships and Mix foldables keep enough resale value that the sums still point the same way.
The phone to pause over is the one whose “battery” complaint is really a board-level power fault or hidden liquid damage. The diagnostic is there for exactly that: should the cell prove healthy and the trouble sit elsewhere, a swap achieves nothing, and we tell you before any money changes hands, judging it against the beyond-economical-repair mark. It is the guard against paying for the wrong fix.
Frequently asked questions
How much does a Xiaomi battery replacement cost in the UK?
It depends on the sub-brand and model. Xiaomi flagships run £69.95–£84.95, Redmi Note £39.95–£54.95, Poco £49.95–£64.95, and budget Redmi A-series from £39.95. Each model is listed in the table above.
Why does my Redmi Note battery drain faster than it used to?
Redmi Note models have large cells marketed on long run-time, so the same percentage loss of capacity is more visible than on a small-battery phone. Two to three years of cycles is the typical point to replace; a fresh OEM-grade cell restores the headline run-time.
My Xiaomi shuts down above 20% — is that the battery?
Very probably. A phone that switches off while the meter still reads a comfortable figure is showing the classic worn-cell signature — the pack can no longer sustain voltage under demand. The diagnostic confirms it before you commit a penny.
Are your Xiaomi replacement batteries genuine?
We fit OEM-grade, cycle-rated cells matched to the original capacity, so a big Redmi pack genuinely behaves like new again. You will be told precisely what grade is going in before the work begins.
How long is the replacement battery guaranteed for?
27 months on every cell we fit.
Is a swollen Xiaomi battery dangerous?
Yes — a swelling cell is a hazard, not a cosmetic niggle. Stop charging and using the phone and book it straight in; lifting a swollen pack out safely is something we do routinely at the bench.
Will I lose data during a Xiaomi battery swap?
No. Swapping the cell never touches your storage, so the phone returns with everything just as you left it. We still suggest a backup before any repair, as a matter of habit.
Can I send my Xiaomi for battery replacement by post?
Yes. Book online and choose suitable tracked inbound postage. Return delivery follows the terms shown for the order.