One of the most common issues with used iPhones is a damaged battery. The following are some tips on how to correctly evaluate the condition of your battery when purchasing a used iPhone.
1. Battery Health can be checked within Settings
How to check:
Battery Health & Charging > Settings
Maximum Capacity (% indicates battery wear)
Peak Performance Capability
Pros:
Apple's official measuring (most precise)
This indicator informs you when performance throttling takes place.
Cons:
It is possible to reset the iPhone by Restoring the iPhone
The charger doesn't show the charging cycles
2. You can request the count of charge cycles.
How to Find
Coconut Battery (third-party tool) is required on Mac and PC
Normal range
<500 cycles = Good
500-1000 cycles = Worn
>1000 cycles = Needs replacement
Pros:
It's more precise than "Maximum capacity" by itself.
Reveals true battery age
Cons:
Requires a connection to a computer
Some sellers won't allow you to take this test.
3. Test Real-World Battery Drain
What to look for:
Use iPhone as normal for 30+ minutes
Verify that the battery does not decreases by more than 1% in light usage
Pros:
Reveals real performance (not just numbers)
Cons:
Time-consuming
Online purchases are difficult to test.
4. Be on the lookout for sudden shutdowns
How to Find
If the iPhone is unable to function at a random rate of 10%-30%, inquire if it is still working.
Battery Health > Settings > Battery Health.
Pros:
Reveals severe battery degradation
Cons:
It may take a while for them to appear.
5. Verify whether the Battery has been replaced
How to Check
Repair receipts are required
To look for "Unknown" parts, click Settings > General and About.
Pros:
New battery for longer life
Apple-authorized replacements are compatible.
Cons:
Batteries from third-party suppliers are less durable and degrade faster.
6. Check for swelling or bulging.
How to check:
You can spot this by looking for the warped back panel.
Verify whether the screen falls out of the frame
Pros:
Swelling = immediate hazard (needs replacement)
Cons:
It's hard to see if the phone is in its case
7. Testing of Fast Charging
What to look for:
Make use of a 20W+ charger
Should be charged up to 50 percent in 30 minutes (modern iPhones).
Pros:
Port or battery issue?
Cons:
A charger or cable could be defective
8. Check battery usage graphs
How to Check
Select Settings > Battery
There are drains that may be unusual.
Pros:
Battery life is abnormally high?
Cons:
Use patterns differ per user
9. Compare Apple Standards
Apple's Guideline for Battery Lifespan:
80percent capacity = replacement is needed
iPhones two years old may anticipate receiving 500 cycles.
Pros:
Be honest regarding your expectations
Cons:
The average usage could be higher than these figures for heavy users
10. Question Usage History
The Most Important Questions
What percentage of the battery was charged over the course of a night?
Did you make use of fast charging frequently?
Was it heavily used in video games/video?
Pros:
Extreme usage = faster degradation
Cons:
Sellers are not obligated to divulge the truth
Final Battery Shopping Advice
Apple-replaced batteries have the highest health rating, and can last for 400 cycles.
Acceptable: 600 cycles, 85-89 The acceptable range is 85-89 %.
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10 Tips For Evaluating copyright Lock & Network Compatibility On Refurbished Or Used Iphones
It is possible to be left with a Wi-Fi only device when you buy a used or used iPhone with the incorrect copyright lock. Here's a guide on how to check compatibility with networks prior to purchasing, with pros and con for each option.
1. Check copyright Lock Status via Settings
How to Check
Settings > General > About
Check for "copyright Lock" or "No SIM Restrictions"
Pros:
Instant verification if unlocked
You can work without the use of a SIM card
Cons:
Some iPhones show "No SIM Restrictions" but are still locked.
2. Use a different SIM card
How to check:
Borrow SIM from another service provider (e.g. If you're purchasing the Verizon Phone, you can insert the T-Mobile SIM).
If the phone is asking to "Activation Lock", it is tied to a particular copyright.
Pros:
Real-world tests (most trustworthy)
Cons:
Multiple SIM cards are required
Sellers are not allowed to allow this.
3. Make use of the Apple IMEI Check (GSX Report)
How to Check
Enter your IMEI number in the Check Your Coverage page of Apple.
IMEI.info and other websites from third-party sources will also display the lock status
Pros:
Official Apple data (if unlocked via Apple)
Cons:
The third-party unlocks aren't always visible
4. Ask for Original copyright & Unlock Evidence
Answers to Key Questions
What copyright sold this iPhone?
Have you received an unlock confirmation email?
Pros:
Permanent unlocking for specific carriers is available
Cons:
There are many sellers who don't provide documentation
5. Check for iPhones marked "Flexible" (and are automatically unlocked)
How It How It Works
Apple Retail iPhones (not those supplied by carriers) are usually unlocked after 60 days.
Pros:
No need to obtain approval from the copyright
Cons:
It is easy to confirm with the original receipt
6. Check the Network Bands on your copyright
Be sure to check:
Comparing iPhone model (A number) with the copyright band
T-Mobile is an example. T-Mobile requires band 71. AT&T requires band 14.
Pros:
The full strength of the signal can be guaranteed
Cons:
Technical (requires additional research)
7. Test the 5G/4G speeds (if it is possible)
How to Check
Insert your SIM card and perform the speed test
Verify if it is connected to 5G/LTE (not just 4G)
Pros:
Confirms actual performance
Cons:
Requires active SIM & data plan
8. Find "SIM not supported" error messages
Red Flags
When starting up the program, you will be greeted with "Invalid SIM"
Even with good coverage "No Service" can occur
Pros:
Reveals hard locks
Cons:
It could be the SIM tray.
9. Avoid iPhones on "Blacklist" or with Finance
How do you check:
Use IMEI checkers (Swappa, T-Mobile's IMEI check)
If you are told that the item was stolen or lost, avoid it
Pros:
Do not buy a mobile phone
Cons:
Some sellers cover their blacklist status
10. Purchase only "Factory Unlocked iPhones" (Safest Option).
How to confirm:
Original packaging says "SIM-free"
The "No SIM Restrictions" that is displayed in the General section of Settings It is accessible under About.
Pros:
Work on all carriers
No unlock headaches
Cons:
The prices are generally higher
Best Advice
Always try the SIM prior to purchasing
Keep your promises about "locking but unlocking later" keep in mind
Don't purchase an iPhone from the blacklist.
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