The battery of a pre-owned iPhone can be diminished. Below are some guidelines on how to evaluate the condition of your battery when purchasing an used iPhone.
1. Battery Health is checked in Settings
What to look for:
Battery Health & Charging is found in Settings > Battery
Maximum Capacity (% indicates wear on the battery)
Peak Performance Capability (warnings indicate the possibility of throttling)
Pros:
Apple's official measure (most trustworthy).
Displays if the performance throttling feature has been enabled
Cons:
Restoring your iPhone will reset your iPhone.
It doesn't show the charge cycle
2. Ask for Charge Cycle Count
How to Find
Requires Mac/PC and Coconut Battery (3rd-party tool)
Normal range
<500 cycles = Good
500-1000 cycles = Worn
>1000 cycles = Needs replacement
Pros:
More precise Than "Maximum Capacity" all by itself
The battery's age is revealed. battery
Cons:
Needs to be connected to the internet via a computer
Some sellers won't let this test.
3. Battery Drain in Real World
How to check:
Use your iPhone normally at least 30 minutes
Verify that your battery isn't dropping by more than 1% per minute at a low level of usage.
Pros:
Shows actual performance (not just numbers)
Cons:
Time-consuming
Test your purchase online before buying
4. Watch out for unexpected shutdowns
How to check:
Find out if iPhone randomly shuts down at 10%-30%
Review Settings > Battery > Battery Health for warnings
Pros:
The battery degradation revealed
Cons:
You might not be able to be able to see the results immediately
5. Check if the battery has been replaced
How to Find
Make sure you have receipts for all repairs.
Click on Settings > General > About to view "Unknown Part" warnings.
Pros:
New batteries last longer. lifespan
Apple-authorized replacements are trusted
Cons:
Cheap batteries from third parties degrade quicker
6. Look for any signs of swelling or bulging.
How do you check:
Back panel warpage is easy to identify
If the screen seems to be being lifted from the frame it is important to check.
Pros:
Swelling = immediate hazard (needs replacement)
Cons:
The case can make it hard to distinguish the phone
7. Fast Charging test
How to Check:
Use a 20W+ charger
Should charge ~50% in 30 mins (modern iPhones)
Pros:
Low charging? Battery? port issue
Cons:
It could also be the power cable.
8. Review the graphs of battery usage
How to Find
Choose Battery from the Settings menu
Check for any unusual background drain
Pros:
Find out whether your battery is rapidly dying.
Cons:
Users are able to use different patterns usage
9. Compare Apple Standards
Apple's battery longevity guidelines:
80 percent capacity = Replace.
iPhones two years old can be expected to receive 500 cycles.
Pros:
The expectations should be realistic.
Cons:
The usage rate may be higher than these figures for heavy users
10. Use History: Ask about Use
The Key Questions:
Was it mostly charged over the course of the night?
Have you tried using a fast charging?
What's the most popular application of this device? gaming and video?
Pros:
Extreme usage = faster degradation
Cons:
Sellers might not be honest about their information.
Final Battery Buying Buying Advice:
Apple-replaced batteries have the highest health rating and 400 cycles.
Acceptable : 85-89% 600 cycles (budget Option)
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10 Tips To Check Activation Lock & Icloud Status On Refurbished/Used Iphones
Purchase an iPhone that comes with Activation Lock (iCloud Lock) could turn your phone into an expensive paperweight. How to check iCloud status prior to purchase. Each method has pros and cons.
1. Apple's website lets you verify the status of your activation lock.
How to check:
Enter your IMEI/serial number on Apple's Activation Lock Page.
Pros:
Official Apple verification
If the seller offers an IMEI, verify if it is working prior to buying.
Cons:
Some sellers are not willing to share IMEI up front
2. Complete a complete reset in the individual
How to Find
For erasing all settings and contents, go to Settings > Reset General > All Content.
After you reset iCloud You may be asked to enter the Apple ID password
Pros:
Tests conducted in person are the most trustworthy
Cons:
Requires the cooperation of the seller
Remove all data from the computer (seller could refuse).
3. Verify "Find My Phone" Status
Verifying:
Find My iPhone by going to Settings, [Apple ID] and finally Find My iPhone.
Even if the account been shut down, you can still access your device.
Pros:
Be sure to read the description before buying
Cons:
Seller may disable it temporarily
4. Start the Startup and look for the "Hello" screen.
How to Find
An iPhone that is used for a while should show the "Hello setup screen"
It is possible to skip the Home Screen if it takes you straight there.
Pros:
Obvious red Flag
Cons:
Certain sellers can restore correctly
5. Verify iCloud Account in Settings
How to Find
Apple ID at the top of the Settings page
If an email is marked as signed in, it still is counted.
Pros:
Checks if the account's active.
Cons:
Seller can take account off after showing you
6. You can request the original receipt from purchase
Why it is important:
Apple needs proof to get rid of Activation locks
Pros:
Legitimate sellers provide receipts
Cons:
There are a lot of iPhones which do not have a paper trail.
7. Verify the Remote Management (MDM lock)
How to Find
When installing, if "Remote Management option" appears, you will need to select corporate/school locking.
Pros:
Reveals hidden enterprise locks
Cons:
It is the only time it appears is after reset
8. Third-party IMEI Checkers
Services such as:
Swappa ESN Checker IMEI24
Pros:
Confirm the blacklist/FMI Status
Cons:
There are some charges
Not 100% trustworthy
9. Test iCloud Features
What to look for:
Use Find My Device and iCloud to enable backups.
If blocked account still linked
Pros:
Proves full iCloud functionality
Cons:
Access to the account is essential
10. Beware "iCloud Unlocked Claims"
Red Flags:
"Bypassed by DNS method"
Update iOS is working, but it doesn't work with the app.
Pros:
Beware of illegal bypasses
Cons:
Some sellers hide this well
The Most Important Takeaways
Always check Activation Lock before paying
Never trust a device still registered with an Apple ID
Do not use iCloud bypassed iPhones
Best Practice
Apple Store Verification: Meet in an Apple Store
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