Battery Performance Monitor
Real-time laptop battery analytics using Browser Battery API
Current Battery Status
Time Remaining
Calculating...
Battery API Information
Available Data
Browser Compatibility
✓ Chrome/Edge (with flags)
Enable chrome://flags/#battery-status-api
✗ Firefox
API removed for privacy reasons
✗ Safari
Never supported
⚠ Mobile Browsers
Limited or no support
Simulated Battery Data
⚠ Battery API not supported
Showing simulated data for demonstration purposes. For real battery data, use system tools or desktop applications.
Get Real Battery Data
Windows Commands
# Generate detailed battery report
powercfg /batteryreport
# Quick battery info
powercfg /query
macOS Commands
# System battery info
system_profiler SPPowerDataType
# Battery cycles
ioreg -l | grep Cycle
⚠️ Battery API is not supported in your browser. This test requires a device with battery monitoring capabilities.
How Our Deep Scan Works
1. We Take 200 Snapshots of Your Battery
Look, most battery tests? They check once, maybe twice, call it a day. We're not doing that. For 20 full seconds, we're watching your battery like a hawk. Ten readings. Every. Single. Second. When it's all said and done, we've grabbed 200 separate measurements.
So why bother with all that? Simple - batteries don't act the same from one moment to the next. Right now it's draining slow. Two seconds later? Totally different story. Could be apps in the background, your screen brightness, whether WiFi's searching for a signal - honestly, it's a million things. Check once or twice and you're just taking a wild guess. But 200 times? Now we're talking. That's how you actually see what's going on.
2. Real-Time Monitoring While Testing
While this thing runs, you're not stuck wondering what's happening. It updates twice a second right there on your screen. You can literally sit there and watch what your battery does. Here's the breakdown:
- Current Level: Your battery percentage. Nothing fancy.
- Voltage: Okay so think of it like water pressure in a hose, except it's electricity. Healthy batteries hang out somewhere between 3.7V and 4.2V.
- Temperature: Is your battery getting hot? This'll tell you.
- Drain Speed: THIS is what you want to watch. Shows you exactly how many percentage points you're losing per hour.
3. Analyzing the Data for Patterns
Alright, we've got our 200 readings. Now we chop 'em up into 10 separate chunks and look at each one individually. What matters here? Consistency. Is your battery predictable or all over the map?
- Draining at a nice steady pace? Beautiful. That's what you want. That's a healthy battery doing its thing.
- Jumping around like crazy - fast one second, slow the next, then fast again? Yeah, that's not great. Usually means something's up.
- Huge swings when you compare different time periods? Your battery's probably getting old. It's struggling to keep things stable.
4. How We Calculate Your Battery Score
You start at 100. Then we start taking points off based on what we found:
- Fast drainage: Dropping more than 15% an hour? Ouch. We're taking up to 30 points off. How much depends on just how bad it is.
- All over the place: Drain rate jumping around wildly? That'll cost you up to 20 points. Good batteries don't do that.
- Running on fumes: Under 20%? That actually stresses your battery out. Automatic 10-point penalty if we catch you there.
Whatever you've got left - that's your score.
5. What Your Score Actually Means
6. Understanding Your Test Results
Discharge Rate: How many percentage points you're losing every hour. Somewhere between 1% and 5%? Nice, you're good. Seeing 10% to 15%? Bet you've got apps doing stuff in the background. Higher? Your phone's working hard on something right now.
Time to Empty: This is based on your current drain rate. But listen - the second you open a game or start streaming something, this number's gonna change. It's only telling you how long you've got if you keep doing exactly what you're doing right now.
Samples Collected: More is better, always. It's like checking the weather. Look at the temperature once? Could be anything. Check 200 times? Now you actually know what's going on instead of catching some random spike.
Things to Keep in Mind
- Unplug first. We're testing drain, not how it charges.
- Everything affects results. Screen brightness, apps doing stuff, WiFi searching, cell signal - literally everything.
- Run it a few times at different charge levels. One test won't tell you the whole story.
- We're reading straight from your sensors. If your hardware's cheap, readings might be off.
Understanding Battery Life
Everything's battery-powered now, right? Phone, laptop, tablet, earbuds, watch. All of it. And everyone's asking the same stuff. How do I make it last longer? Can I charge overnight? What's the RIGHT way to charge?
You know what? There's so much BS advice floating around, it's impossible to know what's real. Let's fix that.
What Are Battery Cycles?
Super simple. One cycle = using 100% of your battery. Full to empty, then back to full again. That's it.
Here's a tip worth knowing: once a month, let your device actually die. Like, completely dead. Powers itself off. Then plug it in and charge it all the way to 100%. Know why? This recalibrates the meter. Tells your phone how much battery it's actually got. Skip this and eventually your battery indicator just... lies to you. Gets worse over time too.
Modern Battery Technology
Almost everything nowadays runs on lithium-ion or lithium-polymer batteries. They're actually pretty smart - way more sophisticated than people think. Built-in protections, safety features, the whole deal.
Biggest myth ever? Overcharging. You literally cannot overcharge a modern battery. Can't be done. When you hit 100%, the charging circuit shuts off automatically. Battery stops accepting power. That's why leaving your phone plugged in all night is completely fine. Zero damage.
Leave it plugged in for a week if you want. Seriously. Once it's at 100%, it just... sits there. Drops to 99%? It'll charge back to 100%. That's all that happens.
Heat and Battery Degradation
Wanna know what nobody tells you? Heat destroys batteries. Way, way faster than anything related to charging. Overcharging isn't real. Leaving it plugged in? Fine. Heat though? That'll wreck your battery.
Play games? Edit videos? Run heavy stuff? Your CPU and GPU get HOT. And guess what's sitting right there in the same case? Your battery. Just baking alongside everything else. That sustained heat exposure? THAT'S what kills the chemistry inside and cuts your battery life short.
Got a removable battery? Take it out when you're doing intensive stuff while plugged in. Seriously, just pop it out. Can't remove it? Then you gotta focus on airflow. Hard surfaces only. Keep those vents clear. Maybe get a cooling pad if you do this a lot.
What the Research Shows
All the studies say the same thing. More heat = faster degradation. Period. Heat makes those chemical reactions inside the battery cells go faster, which breaks everything down quicker. This isn't up for debate. It's just physics.
Stuck with a non-removable battery? Then managing temperature is literally all you can do. Hard surfaces. Always. Beds and couches? They block your vents. Do a lot of demanding work? Cooling pad. Get one. They work. Oh and clean the dust out of those vents every so often. Dust just traps all that heat inside.
Finding the Sweet Spot for Charging
So labs have tested this. Charge to 100% all the time? You'll get maybe 300-500 cycles before things start to noticeably decline. Which honestly isn't terrible. But you can do better.
Sweet spot's between 20% and 80%. Batteries hate extremes. Keep yours in that middle zone and you're putting way less stress on the cells. More cycles total. Holds capacity longer. Just works better.
Practical Tips for Battery Care
- Stop stressing about leaving it plugged in - Seriously. Can't overcharge modern batteries. Impossible. Quit worrying.
- Heat's what you should worry about - Temperature matters 10x more than your charging habits. That's where your focus should be.
- Do a full cycle monthly - Zero to 100%, once a month. Keeps that battery meter honest.
- Pop the battery out for heavy stuff (if you can) - Gaming or rendering while plugged in? Remove the battery if it comes out. Protects it from heat.
- Try to stay 20-80% - Won't always work out, but when you can pull it off, your battery'll thank you.
- Airflow, airflow, airflow - Hard surfaces. Clear vents. Good ventilation. Heat's the enemy here.