When purchasing a used iPhone, many people say that the battery condition is their biggest concern.

• Poor battery life, requiring frequent charging
• Slow performance or sudden shutdowns

If the battery has degraded, you may experience these symptoms.

You'd want to avoid situations like "I bought it, but I can't use it comfortably."

 

This article provides a detailed explanation of how to check for battery degradation in used iPhones and points to consider when purchasing one.  

 

 

Key Points to Check for Battery Degradation in Used iPhones

 

When purchasing a used iPhone, the battery condition is extremely important.

As the years of use increase, the battery degrades, which can affect performance. 
 

Therefore, it is essential to check the battery condition before purchasing to avoid future problems. 

Here, we will explain in detail how to check battery capacity, signs of degradation, and how to address them. 
 

We will also touch upon how battery degradation affects the overall performance of the device. 

 

 

Check battery capacity

 

Checking the battery capacity of a used iPhone is crucial for understanding the device's condition. 
 
If the battery capacity is low, the charge duration will be shorter, potentially hindering daily use. 

Therefore, it is wise to check the battery condition before purchasing and consider replacement if necessary. 

 
Battery capacity gradually decreases with the iPhone's age and number of charge cycles. 

Typically, after 500 charge cycles, the maximum battery capacity is said to decrease to about 80% of its original capacity. 

 

 

How to check battery condition

 

The battery condition of an iPhone can be easily checked from the Settings app. 

 

1. “Settings”
2. “Battery”
3. “Battery Health & Charging”

 

Tapping in this order will display the maximum battery capacity. 

 

The current capacity is displayed as a percentage of the new capacity (100%), so if it's 80% or below, the degradation is considered to be advanced. 

Also, check the "Peak Performance Capability" section; if it says "Normal Peak Performance," there is no problem. 
 

If it says "Service," the battery degradation is advanced, and replacement should be considered. 

 

 

 

Signs of battery degradation and how to address them

 

Battery degradation has several signs. 

• Battery drains faster
• Sudden power-offs
• Device becomes unusually hot

 

If you observe symptoms such as these, battery degradation may be advanced. 
 

Battery replacement is the most effective solution.

By replacing the battery at an authorized Apple service provider or a third-party repair shop (unauthorized repair shop), you can restore the device's performance. 
 

The advantage of authorized repair shops is the peace of mind that comes with receiving an Apple-genuine battery replacement, ensuring that manufacturer or carrier warranties and trade-in values are not affected after the repair. Unauthorized repair shops, on the other hand, offer the benefits of relatively lower prices and same-day repairs, so you can choose the option that best suits your needs.

 

At PRODIG Akihabara store, in addition to selling used iPhones, iPads, and Androids, we also offer repairs such as battery replacement, glass replacement, and LCD replacement for smartphones and tablets!

For iPhone models 11 and later, a system has been introduced to ensure maximum performance even with battery degradation, and measures are being taken.

However, it remains important to take the following precautions to extend the life of your iPhone by minimizing battery degradation:

• Avoid extreme temperatures (especially high temperatures accelerate degradation)
• Avoid complete discharge and overcharging; charge within the 20% to 80% range
• Use genuine chargers and certified accessories
• Reduce unnecessary background processes to lighten the battery load

For iPhone 15 models and later, the charging limit can be set between 80% and 100%, which can be utilized to extend battery life.

By paying attention to these points, you can extend the battery life and use it comfortably for a long period. 

 

Other Points to Check Besides Battery in Used iPhones

 

 

When purchasing a used iPhone, the battery condition is important, but there are several other points to check. 
 
Checking these points in advance can prevent problems after purchase and help you acquire a device that you can use with peace of mind. 

 

Here, we will explain in detail important but often overlooked checks such as warranty coverage, operation restrictions, exterior inspection, and SIM lock status. 
 
By understanding these points, you can make your used iPhone purchase safer and more satisfying. 

 

 

 

Check for warranty coverage

 

When purchasing a used iPhone, warranty coverage is extremely important. 
 
Authorized retailers and reputable used product stores often offer a warranty for a certain period. 

This warranty provides peace of mind in case of a malfunction. 

 

Check the warranty period and coverage to understand how much repair or replacement is covered.

It's also a good idea to check if AppleCare+ is still active.

AppleCare+ is an extended warranty program that offers discounted repairs and replacements for accidental damage. 
 

If there is no warranty, you need to consider the cost of repairs in case of a malfunction before purchasing. 

Generally, common repairs such as screen repair and battery replacement can be done at an Apple Store or authorized repair shop, but the costs are not insignificant. 

 

 

Check for operational restrictions

 

When purchasing a used iPhone, it is extremely important to check if there are any operational restrictions. 
 

"Red ROM" status is particularly noteworthy. 

This refers to a state where communication restrictions are imposed by a carrier (Docomo, au, SoftBank, etc.) due to reasons such as unpaid device fees. 

A "Red ROM" device cannot communicate and is essentially unusable. 

 

Before purchasing, check the IMEI number and verify on each carrier's website whether there are any usage restrictions. 

The IMEI number can be found under "Settings" > "General" > "About." 

 

Also, it is necessary to check whether the activation lock has been deactivated. 

Activation Lock is a security feature that links an iCloud account to the device.

If it is not deactivated, the device cannot be used without the previous owner's Apple ID and password. 
 

 

Also check the exterior

 

The exterior condition of a used iPhone is an important indicator of the device's usage history. 

Be sure to check for screen cracks or scratches, and frame dents. 

 

Exterior damage is not just a cosmetic issue; it could indicate internal malfunctions. 

Also, it's important to check the responsiveness of all buttons. 

 

We recommend physically operating the device to check if the power button, volume buttons, and home button (if applicable) function normally, and if there are any issues with the touchscreen's responsiveness. 

 

Furthermore, check for scratches or cloudiness on the camera lens, and any issues with speaker or microphone sound quality. 

Replacing these parts can be relatively expensive, so checking them before purchase is important.  

 

 

 

Check if SIM lock is applied

 

Finally, it is also important to check the SIM lock status. 
 
If the SIM is locked, you cannot use SIM cards from carriers other than the specific one. 

iPhones released after October 2021 are sold SIM-free, but caution is needed for older models. 
 

By checking the SIM lock status before purchase and unlocking it if necessary, you can create an environment where you can use your device more freely. 

SIM unlock procedures can be performed on each carrier's website or at their stores. 
 

If the SIM lock is released, you can use SIM cards from various carriers both domestically and internationally, allowing for flexibility when traveling or switching providers. 

Furthermore, by using a low-cost SIM, it is possible to significantly reduce communication fees. 

 
By carefully checking these points, you can confidently purchase a used iPhone and use it comfortably for a long time. 

 

Pros and Cons of Buying a Used iPhone

 

 

When considering the purchase of a used iPhone, it is crucial to understand its advantages and disadvantages. 
 
While there is the appeal of obtaining one at a lower price compared to a new device, there are also several points to be aware of. 

 

Here, we will explain in detail the main pros and cons of buying a used iPhone. By considering this information, you will be able to make the best choice that suits your needs. 

 

 

 

Pro① Get a high-performance device at a lower price.

 

The biggest advantage of a used iPhone is that you can buy it at a significantly lower price compared to a new one. 
 
In particular, models that have been on the market for 1-2 years are still perfectly usable in terms of performance, while their prices have dropped significantly. 

For example, it's not uncommon to find an iPhone that costs over 100,000 yen new for less than half price used. 
 
Leveraging this price difference increases your chances of choosing a higher-performance model within your budget. 

 

 

 

Pro② No carrier restrictions after purchase

 

When purchasing a new iPhone and signing a contract at a carrier store, you may be tied into a long-term contract. 
 
However, used iPhones are often sold unlocked, allowing you to freely choose your preferred carrier or MVNO. 
 
This enables you to reduce communication costs and flexibly change your plan to suit your lifestyle. 

 

 

 

Pro③ You can choose your favorite model from a wide range of options available in the market.

 

The used market offers a variety of models, including not only current models but also those released in the past. 

 
It's easier to find older models that are no longer available new, or specific color variations. 

For example, if you prefer a compact size, you can choose an older model from the iPhone SE series. 

 
In this way, the ability to find your ideal model from a wider range of options to suit your preferences and needs is another major advantage of used iPhones. 

 

 

 

Con① You need to carefully check if there are any operational restrictions.

 

The biggest concern when purchasing a used iPhone is whether the device has any operational restrictions. 

 
Particular attention should be paid to a state known as "red ROM." 

This refers to a state where communication restrictions have been placed on the device by the carrier due to reasons such as unpaid device fees. 

 
A red ROM device is practically unusable, so it's important to check with each carrier's website using the IMEI number before purchasing. 

 

 

Con② Accessories may not be included.

 

When purchasing a used iPhone, unlike a new one, accessories may not be complete. 

 
In particular, chargers and earphones are often missing. If you need to purchase these accessories separately, additional expenses will be incurred. 
 
It is wise to check for the presence of accessories before purchase and factor in the cost of separate purchases if necessary. 

 

 

Con③ The battery may be degraded.

 

One of the biggest concerns with a used iPhone is battery degradation. 
 
The longer the usage period, the lower the maximum battery capacity, and the shorter the time it can be used on a single charge. If the battery capacity drops below 80%, performance will also start to be affected. 

 
It is necessary to check the battery condition before purchase and consider the cost of battery replacement if necessary. You should also be aware that you might need a battery replacement soon, potentially leading to an over-budget situation.
 
However, some used retailers sell devices with replaced batteries, so choosing such products is also an option. 

 

 

When purchasing a used iPhone, checking the battery condition is essential.

 

 

Purchasing a used iPhone is an attractive option for obtaining a high-performance device at a reduced cost. 
 
However, there are important points to check, such as battery condition and the presence of operational restrictions. While used iPhones offer advantages not found in new devices, there are also risks such as missing accessories and unexpected defects.

By carefully selecting according to the points introduced in this article, you can make a satisfying used iPhone purchase. 

 

Furthermore, for those who wish to purchase a used iPhone with greater peace of mind, please consider using "PRODIG," the official online store for used smartphones and tablets.

PRODIG offers strict quality standards and a 180-day long-term warranty, and only handles devices with a battery capacity of 80% or more. 

With a wide selection and fast shipping, you're sure to find the perfect used iPhone for you. 

 

Click here for a list of used iPhone products offered by PRODIG.

 

Click here for a list of used smartphone products offered by PRODIG.