View real-time battery information including charge level, charging status, and time estimates.
The Battery Status API provides real-time updates as your battery charges or discharges.
Time estimates may not be available on all devices and browsers.
This API works best in Chromium-based browsers. Firefox and Safari have limited support.
Modern devices use lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries. They work by moving lithium ions between an anode and cathode through an electrolyte. Key advantages include high energy density, no memory effect, and low self-discharge. Battery capacity is measured in milliamp-hours (mAh) or watt-hours (Wh).
Lithium-ion batteries degrade over time. A typical laptop battery retains 80% capacity after 300-500 charge cycles. To maximize lifespan: keep charge between 20-80%, avoid extreme temperatures, don't leave devices plugged in at 100% constantly, and use the manufacturer's recommended charger. Fast charging generates more heat, which can accelerate degradation over time.
The Battery Status API provides information about the system battery. It reports the current charge level (0-100%), whether the device is charging, and estimated time until full charge or discharge. Note that this API has been deprecated in some browsers (like Firefox) due to privacy concerns — battery status could potentially be used for device fingerprinting.
The Battery Status API has been deprecated in Firefox and Safari due to privacy concerns. It's still supported in Chrome and Edge. If your browser doesn't support it, you'll see a "not supported" message.
Modern laptops have charge management that reduces stress on the battery. However, keeping the battery at 100% constantly can slightly accelerate degradation. Many manufacturers offer software to limit charging to 80% for regular use.
The estimated remaining time is calculated based on current power consumption, which varies with workload. It's a rough estimate — running intensive applications will drain faster than the estimate suggests, while idle use will last longer.