How Many Years Does a Used iPhone Last? Battery Life Guidelines and How to Extend It

公開日: 2025年05月19日更新日: 2025年07月24日

Many people considering buying a used iPhone are curious about how long it will last.

"How long do used iPhones last?"

"Is there a way to make a used iPhone last longer?"

This article explains how long used iPhones last. We also cover iPhone battery life and tips to extend its lifespan.

[Conclusion]

The lifespan of a used iPhone typically ranges from 1 to 4 years, depending on its condition. A used iPhone can last longer if the battery is replaced and it is used carefully.

[By reading this article to the end, you will learn]

How long used iPhones last
An estimate of battery life
Ways to make a used iPhone last longer

Let's take good care of your used iPhone and make it last.

How Long Do Used iPhones Last? An Estimate

Model Condition	Estimated Lifespan
New-old Stock	2-4 years (longer if in good condition)
Used for several years (no battery replacement)	1-2 years (can be extended with battery replacement)
Used (battery replaced)	Original lifespan + 2-3 years extended

Used iPhones come in three conditions:

New-old stock
Used for several years (no battery replacement)
Used (battery replaced)

You can estimate the lifespan for each condition. We'll introduce how the condition of a used iPhone impacts its lifespan.

Lifespan of New-Old Stock

New-old stock refers to items that have been shipped but are unused. Although they have been handled, their condition is like new because they are unused.

Under normal use, they can be expected to last approximately 3-4 years. In some cases, items in excellent condition may last even longer.

Lifespan of Used Items (Several Years Old, No Battery Replacement)

For used iPhones that have been in use for several years, their lifespan depends on the number of years used and their condition. If the maximum battery capacity at the time of purchase is 80% or more, they can often be used for about 1-2 years.

If the battery has deteriorated significantly, there is a possibility that the lifespan will be shorter than 1-2 years, so it is recommended to consider battery replacement.

Lifespan of Used Items with Battery Replaced

Used iPhones with replaced batteries have the advantage of being equipped with a new battery, allowing them to be used for a longer period than usual.

The estimated lifespan is generally said to be the original usage period plus 2-3 years, and you can expect a longer time without charging compared to used iPhones without battery replacement.

The Average Lifespan of a New iPhone is Generally 3-7 Years

The lifespan of a new iPhone is generally said to be about 3-7 years.

The reason for this 3-7 year range is due to the following three factors:

Apple states an iPhone's lifespan is 3 years
It can be used within the iOS update range for about 5 years
An iPhone can be safely used for a maximum of about 7 years

Let's explain each point in detail.

Apple's Stated Lifespan for iPhone is 3 Years

Apple's official report states, "We assume a model with iOS, iPadOS, or watchOS for 3 years."

3 years is merely a guideline, and many cases last longer than 3 years.

Usable for About 5 Years Within the iOS Update Range

The period for which iOS updates are provided is approximately 5 years from the release date. When updates end, apps may no longer be compatible, and security risks increase.

You can check if the model you are considering is eligible for iOS updates on the Apple official website.

The safe lifespan of an iPhone is up to about 7 years.

Even for models that are no longer eligible for iOS updates, security updates for safe use continue. This applies to models that have been discontinued for about 7 years.

After iOS updates end, the risk of device malfunctions and battery depletion increases, so caution is advised.

An iPhone battery below 80% is a benchmark for replacement.

When choosing a used iPhone, the remaining battery level is important. If the battery is below 80%, you should consider replacing it.

We will explain the following three points about iPhone batteries:

How to check maximum battery capacity
Battery replacement method
Battery replacement cost

The battery is an important factor for extending the life of your iPhone. Let's cover the key points.

How to check maximum battery capacity

You can check the maximum battery capacity by navigating to "Settings" → "Battery" → "Battery Health & Charging".

If the maximum battery capacity is below 80%, it's time to consider a replacement. Regularly check your battery's maximum capacity.

Battery Replacement Method

iPhone battery replacement can be done at Apple Stores or authorized service providers. Apple Stores and authorized service providers are known for their high safety standards.

While repairs at unauthorized shops may be cheaper than at Apple Stores or authorized service providers, the quality and use of compatible parts may affect the device's performance.

Although you have the option to replace the battery yourself, it requires technical skill and is not recommended.

We recommend having your battery replaced at an Apple Store, an authorized service provider, or a trustworthy unauthorized shop.

How to Make Your Used iPhone Last Longer

Here are five ways to make your used iPhone last longer:

Choose a used item in good condition.
Purchase from a retailer with comprehensive warranty.
Handle the battery carefully.
Use appropriate protective cases and films.
Avoid excessive water exposure and humidity.

Let's explain each point in detail.

① Choose a used item in good condition.

Check Item	Checkpoints	Caution
Appearance	・Are there no noticeable scratches or dirt? ・Are there no cracks or dead pixels on the LCD?	Be cautious if there are large scratches or screen lifting.
Operation	Is touch and button operation smooth?	Be cautious if touch or buttons are unresponsive.
Battery	Is the maximum capacity 80% or more?	If below 80%, consider battery replacement.

To make a used iPhone last longer, it's crucial to choose one in good condition. The three key points to check when buying are appearance, operation, and battery.

Check for "no significant scratches or dirt on the exterior," "smooth touch and button operation," and "battery maximum capacity of 80% or more."

Rank	Condition
S Rank	・Almost no signs of use, like new ・Absolutely no scratches or dirt ・No functional issues whatsoever
A Rank	・Minor, unnoticeable scratches or signs of use, but overall beautiful ・No functional issues ・No significant damage to the screen or body
B Rank	・Signs of use, with multiple small scratches or dirt ・Functions normally, but the exterior shows some minor damage ・No hindrance to daily use
C Rank	- Noticeable scratches and dirt, with significant exterior damage - May have minor operational defects - Depending on the device, repair may need to be considered

*Ranking standards vary by store, so conditions may differ even within the same rank.

Some retailers use product rankings. The higher the rank, the better the condition.

If you plan to use it long-term, choosing a higher-ranked item is recommended.

② Purchase from a retailer with comprehensive warranty.

If you want to use a used iPhone for a long time, choose a retailer with a comprehensive warranty. By opting for a store's warranty, you can get repairs if any issues arise.

Warranty details and coverage vary by retailer, so be sure to check the warranty terms before purchasing.

Additionally, PRODIG has strict inspection criteria and a 180-day warranty system, so even first-time buyers of used iPhones can use our services with confidence.

③ Handle the battery carefully.

Point	Specific Method	High-load Usage
Maintain appropriate charging range	Manage charging to keep the remaining capacity between 20-80%. Avoid full charging or complete discharge.	Using the battery until 0% or leaving it at 100%.
Avoid extreme temperatures	Do not use or store in high (above 35℃) or low (below 0℃) temperature environments.	Leaving it in direct sunlight in summer. Leaving it in a car in winter.
Use genuine accessories	Use reliable charging cables and adapters to prevent excessive current and heat generation.	Using unreliable non-genuine accessories or degraded accessories.
Limit use during charging	Avoid high-load activities like gaming or video streaming while charging.	Playing games or watching videos for long periods while charging.
Utilize optimized charging	Turn on "Optimized Battery Charging" in "Settings" → "Battery" → "Battery Health & Charging" and then charge.	Charging continuously with optimized charging turned off.

By handling the battery carefully, you can extend the life of your used iPhone. Using the battery in a way that puts a strain on it will accelerate the depletion of its maximum capacity, so be careful.

To make your used iPhone last longer, it's essential to put in the effort.

④ Use appropriate protective cases and films.

Using protective cases and films designed for your model can extend the lifespan of both the device and its display.

Protective cases and films can shield the device from impacts and scratches when dropped. Especially since corners and sides are prone to scratches, using shock-resistant protective cases and films offers greater peace of mind.

⑤ Avoid excessive water exposure and humidity.

To ensure your used iPhone lasts longer, it's crucial to protect it from water and humidity. While iPhones have some water resistance, they are not completely waterproof.

Excessive water exposure or humid environments can stress the device, leading to malfunctions.

To prevent water damage, it's important to avoid using the device in wet places or high-humidity environments.

If the device accidentally gets wet, immediately wipe it with a dry cloth and allow it to dry in a well-ventilated area.

For long-lasting used iPhones, choose PRODIG.

The lifespan of a used iPhone is about 1-4 years. To make it last longer, it's important not only to choose one in good condition but also to be mindful of how you use it to avoid putting stress on it.

Consider replacing your iPhone battery when its maximum capacity falls below 80%. PRODIG not only sells used iPhones but also offers battery replacement and other repair services.

PRODIG is a full member of the Reuse Mobile Japan (RMJ) association and only handles iPhones that have passed quality inspections, so even first-time users can use our services with confidence.