A damaged battery is one of the most frequently encountered issues on pre-owned iPhones. Use these methods to evaluate battery health and examine their strengths and weaknesses prior to purchasing.
1. Battery Health is checked in Settings
How do you check:
Navigate to Settings > Battery Battery Health & Charging
Maximum Capacity
Capacity for Peak Performance
Pros:
Official measurements of Apple (most trustworthy).
The indicator for the performance throttle will show if it is active.
Cons:
You can restore the iPhone to its original state.
It doesn't display the charge cycle.
2. Request a Charge Cycle Count
How to Check:
Coconut Battery is required to be run on Mac or PC
Normal range
<500 cycles = Good
500-1000 cycles = Worn
>1000 cycles = Needs replacement
Pros:
The "Maximum Capacity" as a whole is no longer true.
The real age of batteries
Cons:
Requires connection to a computer
Some sellers are not willing to accept this test
3. Test Real-World Battery Drain
How to check:
Use iPhone normal mode for at least 30 minutes.
Make sure that the battery does not drop more than one percent per minute in light use
Pros:
Real-time performance is disclosed (not just numbers)
Cons:
Time-consuming
Purchases made online aren't easy to test.
4. Be on the lookout for sudden shutdowns
How to Find
Ask if your iPhone will shut down randomly at 10%-30 percent.
Battery Health can be found under Settings > Battery.
Pros:
A battery degradation test shows the severity of battery degradation
Cons:
It is possible that some of them do not appear immediately.
5. Verify whether the Battery has been Repaired
How to Check:
You can request receipts for repairs
Go to Settings > General > About and view "Unknown section" warnings
Pros:
New batteries mean longer life
Apple-authorized Replacements are Trustworthy
Cons:
Batteries from third-party suppliers are less durable and degrade faster.
6. Examine for Swelling/Bulging
How do you check:
You can spot this by looking for the warped back panel
Check if screen lifts off frame
Pros:
Swelling = immediate hazard (needs replacement)
Cons:
Hard to spot if phone is inside the case
7. Tests for Fast Charging
How to Check
Make use of a 20W+ charger
It should charge 50% within 30 mins (modern iPhones)
Pros:
Slow charging = battery or port issue
Cons:
A faulty charger/cable could be another possibility
8. Make sure you check the battery usage chart
What to look for:
Choose Battery from the Settings menu
Find unusual background drain
Pros:
Find out the cause of your battery rapidly dying.
Cons:
User behavior varies for each user.
9. Compare to Apple's Standards
Apple's Guidelines for Battery Lifespan for Batteries:
80% of capacity = Replace.
iPhones 2 years old can expect to receive 500 cycles.
Pros:
Setting realistic expectations
Cons:
The number of heavy users could be higher than the above averages.
10. Use History: Ask about Usage
Key Questions:
Was it mostly charged over the course of the night?
Did you make use of fast charging a lot?
Was it extensively used for video games?
Pros:
Extreme usage = faster degradation
Cons:
Sellers must divulge all information truthfully
Final Guide to Buying Batteries:
Apple battery changed with a brand new battery that is healthy with a score of 90% or higher and a cycle count of 400.
Acceptable: 600 cycles 85-89%
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10 Tips Essential For Checking Activation And Icloud On Used Or Refurbished Phones
Buying a device with Activation Lock or iCloud Lock could turn it into a high-cost paperweight. Here's how to check iCloud status before purchase as well as pros and cons for each method.
1. Verify the status of your activation lock on Apple's website
How do you check:
Visit Apple's Activation Lock Status Page and type in the serial or IMEI number.
Pros:
Official Apple verification
Before purchase (if the seller provides the IMEI).
Cons:
Some sellers refuse to share IMEI prior to the purchase.
2. Perform a Full Reset in Person
How to check:
Go to Settings > General > Reset > Remove all settings and content.
When prompted to enter an Apple ID password when resetting iCloud Locked
Pros:
The most reliable test in person
Cons:
It requires cooperation from the seller
Data removal may be rejected by the seller.
3. Make sure you check the "Find my iPhone" status
How to Check
Find My iPhone by opening Settings, then [Apple ID] and finally Finding My iPhone.
Even if your account has been deactivated, you can continue to use the device.
Pros:
Quick check before buying
Cons:
The seller could temporarily disable the device
4. Search for "Hello Screen" on Startup
How to Find:
A used iPhone should show the "Hello" setup screen
It is possible to bypass it by going straight to the Home Screen
Pros:
Red flags that are obvious
Cons:
Some sellers are able to restore their properties properly.
5. Verify iCloud Account in Settings
How to Check:
Click on Settings > [Apple ID Name at the Top]
If the email address is listed still signed in
Pros:
This tells you if the account was active or not.
Cons:
You may ask the seller to remove your account after you show them the proof.
6. Ask for the original receipt
Why It Matters:
Apple requires proof of purchase to remove Activation lock
Pros:
All legitimate sellers must provide receipts
Cons:
Most used iPhones don't come with documents
7. Look for "Remote Management", (MDM-Lock)
How to Check:
If "Remote Management", appears during setup, then you can use the corporate/school lock.
Pros:
Reveals hidden enterprise locks
Cons:
After reset, it is the only thing that appears
8. Make use of third-party IMEI Lookup Tools
Services Like:
Swappa ESN Checker IMEI24
Pros:
Confirmation of blacklist/FMI status
Cons:
Some charge fees
Not 100% reliable
9. Test iCloud Features
How to Find
Make sure you enable iCloud backup, or locate my
If blocked account still linked
Pros:
The full iCloud is now accessible
Cons:
Access to account required
10. Beware of claims that claim to unlock iCloud
Red Flags
The bypassed DNS method
It's working, but you aren't able to upgrade iOS
Pros:
Avoiding illegal bypasses
Cons:
A few sellers hide this fact.
Important Takeaways
Always check Activation Lock before paying
Never trust a device still connected to an Apple ID
Avoid bypassing iCloud on iPhones (future issues guaranteed)
Best Practice
Apple Stores for Verification
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