Samsung Galaxy S8 Battery Replacement Cost and Guide

Replacing a Samsung Galaxy S8 battery is the cheapest way to bring a tired S8 back to a full day of use. A 3000mAh replacement battery for the S8 (SM-G950F) costs £7.89 from E-Tech61 (price read 15 October 2026). Doing it yourself also needs back glass adhesive and basic tools; a repair shop will add labour. The job involves heating and removing the glued glass back, so it is a moderate DIY repair rather than a quick swap. Before spending anything, check the battery's health and rule out software causes of drain. Keep in mind that the S8 is a 2017 phone that no longer receives Samsung security updates, which affects whether it should remain your main phone. This guide covers costs, checks, the replacement steps and battery-saving tips.

Galaxy S8 battery at a glance

Detail	Galaxy S8 (SM-G950F)
Battery capacity	3000mAh
Battery type	Lithium-ion, glued in place, not user-removable
Charging	USB-C fast charging and wireless charging
Access	From the back, after removing the glued glass back
Replacement battery price (E-Tech61)	£7.89 (15 October 2026)

Background on the phone is on Wikipedia's Galaxy S8 page. The S8+ (SM-G955F) uses a different, larger battery, so check your model under Settings > About phone before ordering.

Signs your S8 needs a new battery

The phone no longer lasts a day with your normal use.
It shuts down at 15–30% charge, especially in the cold.
The percentage jumps around or drops suddenly.
The phone feels warm when idle, or charges unusually slowly.
The back glass or screen is lifting. This can mean a swollen battery. Stop charging and using the phone and replace the battery promptly.

How to check Samsung S8 battery health

Samsung does not show a simple battery health percentage on the S8 like iPhones do, but you have options:

Samsung Members app: open Samsung Members, go to Support (or Get help) > Phone diagnostics > Battery status. It reports battery life as normal, or recommends replacement.
Battery usage: Settings > Device maintenance > Battery shows which apps use the most power, helping you separate a worn battery from a misbehaving app.
Behaviour: if the phone shuts down early or drains fast even with few apps running, the battery is likely worn.

Samsung S8 battery replacement cost

Option	What you pay for	Notes
DIY	Battery £7.89 (E-Tech61, 15 October 2026), plus back adhesive and basic tools	Lowest cost; risk of cracking the back glass if rushed
Independent repair shop	Battery plus labour	Usually quick; ask what battery is used and the warranty
Samsung	Samsung's repair pricing, if still offered for this model	Availability for a 2017 model varies; check Samsung UK support

We do not quote shop or Samsung labour prices because they vary. Get a written quote, ask whether the price includes a new back glass seal, and check the warranty on the battery.

For Samsung Galaxy S8 (SM-G950F) Replacement Battery 3000mAhBuy now – £7.89

Choosing the best replacement battery

Quality varies between replacement batteries. Look for:

The correct capacity (3000mAh for the S8). Be cautious of listings claiming much higher capacities in the same size; they are rarely accurate.
A battery built to OEM standard with proper protection circuitry.
A recent manufacture date. Lithium-ion cells slowly age on the shelf.
A warranty and a supplier that handles returns.

Many owners look for a factory Samsung S8 battery. Samsung no longer sells new S8 batteries widely through retail, so most replacements are aftermarket. A good battery built to OEM standard performs like the factory part for everyday use.

How to replace a Samsung Galaxy S8 battery

This is an overview. Photo guides are available on iFixit's Galaxy S8 page.

Tools and materials

Heat source: a heat mat, heat gun on low or a hair dryer.
Suction handle, plastic opening picks and a plastic spudger.
Phillips #00 screwdriver and tweezers.
New back glass adhesive (pre-cut is easiest).
High-purity isopropyl alcohol to soften battery adhesive and clean surfaces.

Steps

Discharge below 25% to reduce risk if the battery is damaged.
Power off and remove the SIM tray.
Heat the back glass evenly, especially the edges. The S8's back is curved glass and is the most fragile part of the job.
Lift the back with a suction handle at the bottom edge and insert a pick. Slide picks slowly around the edges, reheating as needed. Avoid pushing deep near the fingerprint sensor beside the camera; its flex cable is attached to the back glass.
Disconnect the fingerprint flex carefully as you open the back, then set the back aside.
Remove the screws holding the wireless charging coil and NFC panel, and lift it away.
Disconnect the battery connector with a plastic spudger.
Release the battery adhesive. Apply a few drops of isopropyl alcohol around the battery edges, wait a minute, then lift gently with a plastic card or wide spudger. Never use metal and never bend the battery. Be careful not to press through to the display, which sits directly beneath.
Fit the new battery with a thin strip of adhesive, connect it and power on to test.
Refit the wireless charging panel and screws, reconnect the fingerprint flex, then fit new back adhesive and press the back into place. Clamp gently while it sets.
Test charging (wired and wireless), fingerprint, NFC and calls.

Safety

A punctured or bent lithium-ion battery can smoke and catch fire. If the old battery hisses, swells or heats up, move it to a non-flammable surface outdoors if safe.
Wear eye protection when handling cracked glass.
Take the old battery to a battery recycling point; GOV.UK's recycling collections finder shows local options. Never put batteries in household bins.

Common mistakes on S8 battery replacements

Too little heat on the back glass. Forcing picks into cold adhesive is the main cause of cracked backs. Reheat often and work slowly.
Too much heat near the screen. The curved AMOLED display can be damaged by excessive heat. Keep the heat source moving and focus on the back edges.
Tearing the fingerprint flex. On the S8, the fingerprint sensor is attached to the back glass. Open the back slowly from the bottom and disconnect the flex before lifting the back fully away.
Prying the battery against the display. The display's back is directly under the battery. Pressing down with a tool can create a dead spot or crack in the screen. Lift from the edges with a wide plastic card.
Skipping new adhesive. Reusing old adhesive lets the back lift and lets in dust and moisture.
Testing after sealing. Always test charging, fingerprint and wireless charging before the back goes on for good.

Calibrating after a new battery

A new battery's percentage reading can be inaccurate for the first few cycles. To help the phone learn the new battery:

Charge to 100% and leave it on charge for another hour.
Use the phone normally until it reaches a low level, ideally around 5–10%.
Charge back to 100% without interruption.
Repeat once or twice if readings still seem odd.

After calibration, judge battery life over a few normal days rather than the first day, which often includes heavy setup and app updates.

DIY or repair shop?

Choose DIY if you have opened a glass-backed phone before, have a heat source and patience, and are comfortable with the risk of cracking the back. Choose a repair shop if you have not done this kind of repair, if the battery is swollen (which makes removal more hazardous), or if you need the phone back quickly. A shop will usually include a new back seal and a warranty on the work.

Hypothetical cost comparison

As an illustration only: if a local shop quotes a total that is several times the £7.89 battery price, the difference is labour, adhesive and warranty. For a phone you rely on daily, that can be worth paying. For a spare phone, DIY makes more sense.

How to fix Samsung Galaxy S8 battery drain

If the battery is not old or the drain started suddenly, try these first:

Check battery usage in Settings > Device maintenance > Battery. An app using a large share in the background is the usual culprit; update, restrict or uninstall it.
Restart the phone. It clears stuck processes.
Turn off the Always On Display if you do not need it.
Reduce screen resolution to FHD+ in Display settings and lower brightness.
Use power saving mode on long days.
Turn off features you do not use, such as Bluetooth, NFC and location, or set location to battery-saving mode.
Clear the cache partition from recovery mode after major app or system changes.
Factory reset as a last resort, after backing up, if drain persists without an obvious cause.

How to make your Galaxy S8 battery last longer

Avoid heat: do not charge under pillows or leave the phone in hot cars.
Avoid letting the battery regularly drop to 0%.
Use a good-quality USB-C charger and cable.
Use dark mode (night mode) where available; the S8's AMOLED screen uses less power showing black.
Remove apps you no longer use.

Is it worth replacing the battery on a Galaxy S8?

For a phone that otherwise works well, a new battery is a very cheap way to extend its life. But the S8 is a 2017 phone: its last major Android update was Android 9, and it no longer receives Samsung security updates. The UK National Cyber Security Centre advises against using unsupported devices for sensitive tasks. A fresh battery makes the S8 a good music player, sat-nav, child's first phone without banking apps, or backup device. If it is your main phone for banking and email, consider moving to a supported model.

Other S8 and Samsung repairs

If the screen also needs attention, see our guides to the Samsung S8 screen replacement and the S8 Plus OLED replacement. Parts are in our Galaxy S8 (G950F) parts and Galaxy S8 Plus (G955F) parts collections. For a newer model, our S21 Ultra battery replacement guide shows how the process has changed.

Frequently asked questions

How much does a Samsung S8 battery replacement cost?

The battery is £7.89 from E-Tech61 (15 October 2026). With a shop fitting it, add labour; prices vary between repairers.

How do I replace a Samsung S8 battery?

Heat and remove the glass back, disconnect the fingerprint flex, remove the wireless charging panel, disconnect and lift out the battery with isopropyl alcohol and plastic tools, fit the new one, test and reseal.

How do I remove a Samsung S8 battery?

After disconnecting it, soften the adhesive with a few drops of isopropyl alcohol and lift slowly with a plastic card. Do not bend or puncture it.

How do I check Samsung S8 battery health?

Use the Samsung Members app: Support > Phone diagnostics > Battery status.

How do I fix Samsung Galaxy S8 battery drain?

Check battery usage by app, restart, turn off Always On Display, lower resolution and brightness, and use power saving mode. If drain persists on an old battery, replace it.

Does the S8 battery fit the S8+?

No. The S8+ uses a larger battery with a different size and connector position.

How long does an S8 battery replacement take?

An experienced repairer usually needs well under an hour. A first DIY attempt can take one to two hours, mostly spent removing the glass back and the battery adhesive safely.

Will wireless charging still work after the repair?

Yes, as long as the wireless charging coil is refitted and its connector seated properly. Test it before sealing the back.

Can a worn battery make the S8 slow?

It can contribute. A worn battery struggles to supply peak power, which can cause lag or shutdowns under load. A new battery often makes the phone feel steadier.

Summary

A worn Galaxy S8 battery is cheap to replace: £7.89 for the part, plus adhesive and an hour or two of careful work, or a shop's labour. Check battery status in Samsung Members first, rule out app-related drain, and take your time with the curved glass back. Given the S8's age, use the revived phone for everyday or secondary tasks rather than banking.