GadgetRenu guides / Selling Tips
Check iPhone Battery Health Before Selling or Trade-In
Find your iPhone battery health and service warnings before selling. Understand condition checks and whether replacing the battery makes sense.
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The quick answer
Open Settings → Battery, then Battery Health or Battery Health & Charging, depending on the iPhone and iOS version. Record maximum capacity and any service or parts warning. Report those details accurately; there is no universal resale deduction for each percentage point.
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Good to know.
- Record the warning message as well as the percentage.
- Do not assume a battery replacement earns back its full cost.
- A swollen or damaged battery needs specialist handling.
Find and record the information
Open Settings, choose Battery and look for Battery Health or Battery Health & Charging. Menu labels vary by device and software. Record the maximum capacity figure if available and note service or parts messages. If the information is unavailable, disclose that rather than guessing a number.
Apple’s battery and performance guide explains battery aging and maximum capacity. The figure describes capacity relative to when the battery was new; it is not a complete test of the phone.
Use the current condition descriptions
When requesting a quote, read the battery requirements in the selected condition. Do not assume that 85%, 80% or another number always means the same grade or a fixed percentage reduction across every model and buyer.
A phone can have a high displayed capacity and still have another fault. Check charging, unexpected shutdowns and service warnings, and report them where requested. If the form does not cover your situation, contact support.
Should I replace the battery before selling?
Compare the offer for the phone as it is with a realistic repaired-condition offer, then subtract the written repair cost.
Illustration: if a battery replacement costs $89 but the expected offer difference is $50, replacing solely for resale would leave $39 less before any other costs. Those figures are an example, not a repair price or GadgetRenu quote. If you want to keep the phone longer, restored usefulness may justify a different decision.
Do not confuse a low reading with physical damage
Ordinary battery aging and a swollen, leaking or overheating battery are different issues. Stop normal sale preparation and seek manufacturer or specialist guidance for physical damage. Do not mail such a device under a standard label or try to flatten, puncture or open a battery.
Frequently asked questions
Does every one-percent drop reduce the offer?
We do not publish a fixed deduction per percentage point. Use the current model and condition questions for the actual offer.
Can I sell a non-working iPhone?
GadgetRenu accepts non-working phones. We do not accept Activation/iCloud-locked, blacklisted, financed/unpaid or water-damaged devices. Check that your exact model is listed and describe its condition accurately; a category listing does not mean every device is supported.
Check the full device value
Use the iPhone value guide, then get a quote for your model. If battery life is the only reason to upgrade, consider the repair-or-keep decision.
Your next step
Put the guide to work.
Record capacity and service warnings, then use the current condition descriptions.
Get my offerSources & useful links
Check the original guidance and the terms that apply to your device.
Why choose GadgetRenu?
Check your offer before buying a new battery.
GadgetRenu’s condition questions let you describe the phone you have, including relevant battery or service information. Check that offer before spending on a resale-only repair; our team can help if the available options do not describe your phone.
GadgetRenu LLC has been accredited since September 2026. We are committed to BBB's Standards for Trust, including honest advertising, transparency, and responding to customer concerns.
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Very transparent process. They informed me of the status and progress of my order throughout the whole process from end to end. Sale went exactly as described, flawlesssss
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