Samsung Battery Replacement: The Complete Guide

A customer brought in his Galaxy S22 last week. Two years old, otherwise perfect condition, but the battery was draining by 3pm every day. He'd started carrying a power bank and was considering buying a new phone.

We checked his battery health: 71%. The phone was throttling to compensate for the degraded battery, making everything feel sluggish. £89 and forty minutes later, he had a phone that lasted until bedtime again.

We replace about 150 Samsung batteries a year. Most customers are surprised how quick and affordable it is compared to buying new. Here's what you need to know.

Did You Know?

Our Samsung Battery Replacement Results (2025)

• • 156 Samsung batteries replaced - Galaxy S, A, and Note series
• • Average health before replacement: 68% capacity
• • Most common model: Galaxy S21/S22 (now 3-4 years old)
• • Repair time: 45-60 minutes for most models
• • Customer satisfaction: 97% report "like new" battery life
• • Average cost saving vs new phone: £700+

Data from celltech repair logs, January-December 2025

When Does a Samsung Battery Need Replacing?

Signs Your Battery Is Failing

• Rapid drain - Full charge doesn't last a working day
• Slow charging - Takes significantly longer than when new
• Unexpected shutdowns - Phone dies at 15%, 20%, or higher
• Sluggish performance - Phone throttles to protect weak battery
• Physical swelling - Back panel lifting (urgent - stop using immediately)

Warning

If your back panel is lifting: This indicates battery swelling and is a safety concern. Stop using and charging the phone immediately. Swollen batteries can be dangerous.

How to Check Samsung Battery Health

Unlike iPhones until recently, Samsung has always shown battery health prominently:

1. Open Settings
2. Go to Battery and Device Care
3. Tap Battery
4. Look for Battery status or check More battery settings

You'll see your current capacity as a percentage of original. Below 80% is when most people start noticing problems. Below 70% and the phone becomes frustrating to use.

Did You Know?

Quick check: You can also dial *#0228# on many Samsung models to access a detailed battery status screen with voltage and health information.

Replacement Cost by Samsung Model

Compare this to £800-1200 for a new phone. Battery replacement makes financial sense for most Samsung phones under 4 years old.

What Happens During Replacement

1. Diagnostics
   We confirm battery health and check for any other issues.
2. Back glass removal
   Heat application to soften adhesive, then careful separation.
3. Battery removal
   Disconnect and remove the old battery, clean adhesive residue.
4. New battery installation
   Quality replacement battery fitted with fresh adhesive.
5. Reassembly and testing
   Back glass resealed, full charge cycle, quality checks.

Your data is completely untouched throughout. Battery replacement is purely a hardware swap.

Is Replacement Worth It?

Definitely Worth It

• Galaxy S21 and newer (still receiving updates)
• Phones in otherwise good condition
• Flagship models with strong resale value
• When repair cost is under 15% of new phone price

Consider Carefully

• Galaxy S20 and older (limited software support remaining)
• Phones with other issues (cracked screen, charging problems)
• Budget A-series where new models are relatively affordable
• Recent water damage — batteries can degrade faster after exposure

We'll always be honest about whether replacement makes sense for your specific phone and situation.

Ready for a New Battery?

Most Samsung battery replacements take under an hour. Walk in or book ahead, and you'll leave with a phone that lasts all day again.

Visit us: Byte, Dovehouse Parade, Solihull.
Mail-in: Free shipping both ways across the UK.

Samsung Galaxy battery not lasting like it used to? After 2-3 years, most Samsung batteries show significant degradation. This guide covers warning signs, replacement costs, and whether it's worth replacing vs upgrading your phone. For other Samsung repairs including screen replacements, see our full Samsung repair guide.

Battery Warning Signs

Samsung doesn't make battery health as visible as Apple does, but there are clear signs your battery needs attention:

Definite Replacement Signs

• Swelling: Battery pushing against back glass or screen—replace immediately
• Random shutdowns: Phone dies at 20-30% battery
• Rapid drain: 1% per minute or faster when using apps
• Won't hold charge: Falls from 100% to 80% in under an hour idle
• Overheating: Phone gets hot during normal use or charging

Swollen Battery = Urgent

A swollen battery is a safety hazard. Stop using the phone, don't charge it, and bring it in for replacement as soon as possible. Swollen batteries can catch fire or explode.

Early Warning Signs

• Need to charge more than once daily (with normal use)
• Battery percentage jumps (80% to 60% suddenly)
• Phone feels warmer than it used to during charging
• Charging takes longer than before (also check for charging port issues)

Checking Battery Health

Samsung added battery health checking in One UI 5.0+. Here's how to check:

On One UI 5.0 and Later

1. Open Settings
2. Tap Battery and device care
3. Tap Battery
4. Tap the three dots → Battery usage
5. Look for battery health percentage

Using Third-Party Apps

Apps like AccuBattery can estimate battery health by analysing charge cycles. They're not as accurate as built-in tools but give a reasonable indication.

What the Numbers Mean

Galaxy S Series Batteries

Galaxy A Series Batteries

UK Replacement Cost Summary

What's Included

Our battery replacement includes: genuine or equivalent quality battery, new adhesive, water resistance restoration where possible, and a 27-month warranty on the battery.

OEM vs Third-Party Batteries

The parts debate isn't just for screens—batteries matter too. For a deeper dive into Samsung parts quality, see our Samsung OEM vs third-party parts guide.

Samsung OEM Batteries

• Guaranteed capacity and quality
• Proper charging calibration
• Usually 10-20% more expensive
• Best for newer phones you want to keep long-term

Quality Third-Party Batteries

• Reputable brands match OEM specs
• Often better value
• We only use Samsung-spec replacements
• Same warranty as OEM

Maximising Battery Life

Samsung-Specific Tips

• Use "Protect battery": Settings → Battery → limit to 85%
• Enable adaptive battery: Learns your usage patterns
• Avoid fast charging always: Use regular charging overnight
• Maintain 20-80%: Avoid full discharge or constant 100%

Frequently Asked Questions

How long does Samsung battery replacement take?

Usually 45-60 minutes. Samsung phones require careful opening due to the waterproofing and adhesive. We take time to do it properly and restore water resistance.

Will I lose my data?

No, battery replacement doesn't affect your data at all. Everything stays exactly as it was.

Will my phone still be water resistant?

We reapply waterproof adhesive, but we can't guarantee the original IP68 rating. We recommend treating it as water-resistant rather than waterproof after any repair. If your phone has already suffered water damage, that's a separate repair that may affect the battery too.

Is it worth replacing the battery or should I upgrade?

If your phone is under 3 years old and otherwise working well, battery replacement at £49-89 is much better value than a £600+ new phone. If your phone has other issues or is 4+ years old, upgrading might make more sense.