About iPhone Life Check
Independent battery research & tools
iPhone Life Check is an independent, editorially run website built for one purpose: to help iPhone owners understand their battery health and make better-informed decisions about charging habits, everyday use, and when it may be time to consider service or replacement. We are not a repair shop, we are not a retailer, and we are not affiliated with, endorsed by, or sponsored by Apple Inc. in any way.
Our Mission
Battery health can be confusing. Apple's own Battery Health screen gives you a single "Maximum Capacity" percentage, but translating that number into "how long will my phone actually last today" isn't always obvious. Our mission is to close that gap with a simple, transparent calculator and a plain-language reference guide, so that anyone — not just technically minded users — can understand what their battery health percentage means in practical, everyday terms.
What We Do
Our free calculator combines two inputs — your iPhone model and your current battery health percentage from iOS Settings — to produce an estimated backup time. We also publish a detailed guide covering cycle counts, degradation causes, replacement thresholds, and frequently asked questions, drawing on publicly available Apple support documentation and widely reported battery specifications for each iPhone generation.
We publish the exact calculation we use — reference hours × battery health ÷ 100 — instead of hiding it behind a "black box" result.
Every article is written to be understood without a technical background, while staying accurate to Apple's official documentation.
We don't sell batteries, repairs, or accessories. Our only commercial relationship is standard display advertising.
Model reference data and guidance are reviewed as new iPhone models launch and as Apple updates its public battery documentation.
Our Methodology
How we build and maintain the calculator
Reference battery hours used in the calculator are based on Apple's published specifications for video playback and video streaming per model. The calculator multiplies that reference figure by your entered battery health percentage to produce an estimate. We deliberately keep the formula simple and disclosed in full on the homepage, because we believe an estimate you can verify is more useful than a more "precise-looking" number you can't check yourself.
We do not have access to your device, your usage history, or any diagnostic data — the calculator works entirely from the two values you type in, and nothing is transmitted to a server for processing.
Editorial Team and Review Process
Content on this site is researched and written by our editorial team, then cross-checked against Apple's public support articles and technical specification pages before publishing. When Apple updates its guidance or releases a new iPhone model, we review the relevant pages and update figures where needed.
Why Trust iPhone Life Check
- Independent website — We are not affiliated with Apple Inc. and provide objective, unbiased information.
- Sourced from public documentation — Reference data is drawn from Apple's official technical specifications and support articles.
- Updated regularly — We review the calculator and guide whenever Apple releases new models or updated battery guidance.
- Transparent methodology — Our calculation formula is fully disclosed so you understand exactly how estimates are derived.
- Educational purpose only — Nothing on this site replaces official diagnostics performed by Apple or an Authorized Service Provider.
- No hidden agenda — We don't sell batteries, repair services, or affiliate products. Our sole focus is providing useful, accurate information.
What We Are Not
To be clear about the limits of this site: we are not Apple Inc., an Apple Authorized Service Provider, or a repair business. We cannot diagnose a specific device, perform a physical inspection, or make a warranty or service decision on Apple's behalf. For any of those, please contact Apple Support directly or visit an Apple Authorized Service Provider.
Get in Touch
Have a correction, a question about our methodology, or feedback on the calculator? We'd like to hear from you — visit our Contact page for details on how to reach us.