Battery Health Checker

The estimate starts at 100% and subtracts wear from six factors: estimated total charge cycles (based on your cycles-per-day and phone age), calendar aging, your self-rated condition, heat exposure, physical damage, and swelling. Each factor is weighted by how much it typically affects real-world lithium-ion capacity retention.

No. This is a software estimate based on the details you provide, not a hardware measurement. Official readings (like iOS Battery Health or Android's built-in diagnostics) measure actual capacity using onboard sensors. Use this tool as a general guide, not a certified diagnostic.

One full charge cycle equals charging a battery from 0% to 100%, whether that happens in one sitting or across several top-ups that add up to 100%. If you plug in twice a day for partial charges, that may only count as roughly one full cycle, but this tool uses your daily charging count as a simplified estimate.

Heat and swelling are strong indicators of accelerated chemical degradation and, in the case of swelling, a genuine safety risk. They're weighted heavily because they tend to signal damage well beyond normal wear-and-tear from age or cycle count.

Stop charging and using the device immediately. Avoid puncturing, bending, or applying pressure to the battery. Power off the phone if it's safe to do so, and take it to a certified repair technician as soon as possible. Do not attempt to remove a swollen battery yourself.

Capacity in mAh is used for reporting and context rather than as a direct deduction, since higher-capacity batteries don't inherently age faster or slower. What matters most for degradation is charge cycles, heat, and physical condition.

Avoid consistently charging to 100% or draining to 0%, keep your phone out of high heat (including direct sun and while gaming and charging simultaneously), remove thick cases while fast charging, and avoid cheap or uncertified chargers. Charging little and often between roughly 20% and 80% is generally gentler on lithium-ion cells.

Yes. After running the diagnostic, use the WhatsApp or Facebook buttons to share a summary directly, or click Copy Report to paste it anywhere, such as a message to a repair technician.