How to Check iPhone Battery Health Before Buying (2025 Edition)

You’re about to meet a guy in a Tim Hortons parking lot to buy an iPhone. He says it’s in “great condition.” Cool. But before you hand over that cash, there’s one number you need to check:

Battery Health.

Battery health tells you how much charge the iPhone can hold compared to when it was brand new. On iPhones, it’s shown as a percentage.

It’s crucial to know How to Check iPhone Battery Health Before Buying (2025 Edition) to avoid potential issues.

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How to Check iPhone Battery Health

• 1. Open the Settings app
• 2. Tap Battery
• 3. Tap Battery Health & Charging
• 4. Look for Maximum Capacity (%)

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What’s a Good Battery Health?

• 90%+: Basically new
• 85–89%: Still solid (I personally buy these)
• 80–84%: Getting close to replacement
• Below 80%: Will likely get throttled by iOS or need a new battery soon

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Ask for a Screenshot

If you’re buying online, ask the seller to send a screenshot of the Battery Health screen. If they say:

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ByteFlip Tip

Some sellers have multiple phones.

Make sure the battery health screenshot they sent is for the phone you’re actually meeting for — not a different one in their backpack.

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Don’t Be Afraid of 84%

Honestly, I’ve bought and flipped phones with 83–85% battery health and never had a buyer complain. If the price is right, and the rest of the phone is clean? It’s still a flip-worthy deal.

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ByteFlip Wrap-Up

• Always check the actual battery percentage — don’t take “it’s fine” as an answer

• I stick to 85% and up for most of my flips

• Don’t touch anything below 80% unless you’re factoring in a battery swap