BatteryPro FAQ

A1: BatteryPro is a free battery monitor that runs in your browser. It shows the battery level, whether you are charging and how long the browser expects the charge or the discharge to take, alerts you loudly when the level reaches a limit you set or falls to a threshold, counts charge cycles, draws the level over time, learns when you usually charge, and scores the battery's health and your charging habits. Everything is kept in the browser; nothing is uploaded and there is no account.

A2: Nothing. There is no plan, no limit and no feature held back. Like every page on ZeroDataUpload, the tool is supported by advertising.

A3: No. There is no registration and no login. Open the page and the ring fills to the current level.

A4: Anyone who works on a laptop plugged in for hours and wants to unplug at 80% without watching the tray icon, anyone whose phone or tablet browser reports the battery, and anyone curious about their charging habits. It is also a useful companion for laptops whose maker offers no charge threshold setting.

A5: In Chrome, Edge or Opera on Android, yes: the readings are live and the alerts play while the page is open. The cards stack one above the other. iPhones and iPads use Safari's engine for every browser, and Safari gives no battery readings to web pages, so there the tool shows a simulated battery.

A6: Chrome, Edge, Opera, Brave, Vivaldi and the other Chromium-based browsers on Windows, macOS, Linux, ChromeOS and Android. Firefox and Safari do not pass the battery on to web pages. The badge at the top of the tool says which you have: "Live battery readings" or "Simulated battery".

A7: When the browser gives no readings, the tool runs a pretend battery that charges to your limit and then discharges, updated every 30 seconds, so you can try every control, see the alerts and look at the charts. A notice above the cards says so. Nothing it shows is about your real battery.

A8: Four things: the charge level, whether the charger is connected, the seconds until full while charging and the seconds until empty while discharging. The two time estimates are the operating system's own and are often missing for the first minute after plugging or unplugging. Every other number on the page is worked out from those readings over time.

A9: No. No browser passes those on. For the design capacity, the capacity today and the lifetime cycle count use the operating system's report: on Windows run powercfg /batteryreport in a command prompt and open the file it writes; on a Mac open System Information and choose Power; on Android most makers show it under Settings, Battery. BatteryPro is for day-to-day monitoring and alerts, not for that wear figure.

A10: A computer without a battery is reported as full and on mains power. The tool shows exactly what the browser says; there is nothing to monitor on such a machine.

A11: No. A web page cannot control the charger; only the operating system or the maker's own software can cap charging. BatteryPro watches the level and tells you loudly when it reaches your limit, with a looping beep, a browser notification, a flashing tab title, a warning badge on the tab icon and a notice on the page, so you can unplug at the right moment.

A12: If the charge-limit alert is on: a beep loops at the tone and volume you chose, a notice appears at the bottom right of the page with Stop alert and Dismiss buttons, the tab title flashes a warning for 30 seconds, the tab icon shows a red badge, and if you allowed notifications the browser shows one that stays until you close it. The sound stops when you unplug, or with Stop alerts, the notice's button or Alt+X. The same alert will not repeat within 30 seconds.

A13: It works the same way when the level falls to the threshold (10 to 30%, 20% by default) while not charging. Plugging the charger in stops the sound. The threshold also sets the lowest value the charge limit can take, so the two can never cross.

A14: Many laptops stop reporting a change between 96% and 100% for minutes at a time while the charger trickles the last few percent, and some never report 100% at all. A limit of 96% is the highest value the alert can reach dependably. If you want a full charge, set 96% and leave the charger in a little longer after the alert.

A15: Yes. In a background or minimized tab the page takes a fresh reading every five seconds, so the level in the tab title stays current and the alert still plays, sends a browser notification and flashes the title. Browsers stop refreshing a hidden page's own battery object, which is why the page asks a fresh one each time. The alert sound needs you to have clicked somewhere on the page once in that visit, because browsers block audio a page starts on its own. A sleeping computer runs no pages, so keep the screen awake while you monitor.

A16: No. A sleeping computer runs no web pages. Keep the screen awake, on by default in Smart Features, asks the operating system not to sleep while the page is open and visible; closing the lid overrides it on most laptops. Monitoring resumes when the machine wakes, and the usage chart marks the gap.

A17: Click Enable in the Alerts card and answer the browser's question with Allow. The button then reads Enabled. If it reads "Blocked in the browser", notifications were refused earlier for this site; open the site settings behind the lock icon in the address bar and set Notifications to Allow. On some systems the operating system's own Do Not Disturb or Focus setting hides notifications as well.

A18: Yes. The settings button in the Alerts card opens the alert settings: a volume slider, four tones for the charge-limit beep and four for the low-battery beep (clicking one plays it), the low-battery threshold and a Test button. Sound can be switched off altogether; the notice, the title flash and the notification still appear.

A19: Each sets the low-battery threshold and the charge limit in one click: Conservative 25% to 80%, the kindest to the cells; Balanced 20% to 90%, the default; Extended 15% to 95%, for days away from a socket. The plus button saves a custom profile with its own name, range and icon; up to twelve can be kept, and the keys 1, 2 and 3 pick the first three cards.

A20: Between 11 PM and 6 AM it caps the charge limit at 80%, whatever the slider says, so a laptop left charging overnight does not sit at 95% for hours. At 6 AM the limit returns to the slider's value. It is checked once a minute.

A21: On Saturday and Sunday it adds 5% to the charge limit, capped at 96%, for days when you are out and about and want more run time; on Monday the limit goes back. Both modes change the limit itself, which is why the slider moves when they apply.

A22: Every 5 seconds while the page is visible (every 30 in the background) it stores the level, the hour, the weekday and whether you were charging, up to 1,000 samples, plus the start and end of each charge. From those the Assistant card predicts your next charge time, works out your usual charging window and classes your usage. Switch it off and nothing is recorded; the stored samples stay until you clear the data.

A23: One cycle is counted each time the charger is unplugged while the level is above half your charge limit, and only while the page is open. It is a count of charges this tool has seen, not the battery's lifetime cycle count, which lives in the operating system's report. The bar chart shows the count per weekday.

A24: A gap of more than five minutes between two points, which means the page was closed, the tab was asleep or the computer was off. Hover or tap the point at either end to see how long. The line is drawn dashed so a straight stretch is never mistaken for a steady battery.

A25: It is an estimate, not a hardware reading. Browsers do not expose capacity or wear, so the score is built from what the tool can see: how many charge cycles it has counted, how high your charge limit is and how low you tend to let the battery go. Excellent, Good, Fair and Poor are bands of that score. For the real capacity use the operating system's battery report.

A26: Efficiency comes from the discharge rate measured over the level history: about 1% an hour scores 97, 5% an hour 85, 10% an hour 70. The eco score weighs four things: the charge limit (lower is better), the average level (20 to 90% is best), the counted cycles and how many times a day you charge; A+ to D in the Insights tab, a percentage in the Battery Profile card. The carbon figure assumes a 50 Wh battery, 85% charging efficiency and an average grid, and credits you for the energy a lower limit saves; it is shown after five cycles and is a rough illustration, not a measurement.

A27: Next charge time is the hour you usually plug in on this weekday at a level like today's, from the stored samples, with a confidence that grows with the number of matching samples; it needs at least fifty samples and ten matches. Best charging window is the off-peak hours 23:00 to 06:00 until the tool knows your own habit, then your busiest charging hour plus seven. Lifespan estimate is a band of cycles from industry averages (500 to 1,000, more if your limit and average level are low), minus the cycles counted here. Usage type is Conservative, Balanced, Power or Heavy from your average level over 100 or more samples.

A28: They are built from the time of day and the current reading: grid demand by the hour, a warning below 30% or above 90% while charging, a note when the level is above your limit, an estimate of the hours left at the measured discharge rate, and night or morning tips. Each suggestion with an action has a button that applies it, for example setting the limit to 80% or turning Night mode on.

A29: In your browser's storage on this device, under the tool's own name: the readings, cycle counts, usage patterns, profiles and settings. Nothing is sent to a server and there is no account. Export writes it all to a file; Clear all data deletes it.

A30: CSV writes the level history as a table (date, time, level, charging, cycles, health) for a spreadsheet, one row each time the level or the charging state changed. JSON writes everything the tool knows, settings, limits, profiles, history, cycles and patterns, as a backup that Import can read back on this computer or another.

A31: After a confirmation it merges: usage and level history are combined in time order, cycle counts are added, custom profiles with new names are added, patterns are combined, and settings in the file replace the current ones. A CSV written by the tool imports its rows as history. A file that is not a BatteryPro export is refused with a message.

A32: If you open the tool in the same browser and the old data is still in its storage, it is read once, carried over to the tool's new storage name and the old copies are removed. Data from a different browser or computer has to come across as an exported file.

A33: The tool itself sends nothing and sets no cookies; its storage is the browser's own, under its own name. Like every page on ZeroDataUpload, the page shows ads through Google AdSense and uses Google Analytics, and the cookie banner controls the analytics cookies; the Privacy Policy and Cookie Policy explain what those services collect. Your battery readings are never part of it.

A34: Click Refresh (Alt+R) to read the battery again. If the badge says "Simulated battery", your browser gives no readings. If the tab was in the background for a long while, the browser may have paused it; bringing it to the front reads the battery straight away. On a laptop that reports in whole percents a change can simply take a while.

A35: Check that Sound is on in the Alerts card and the volume is up in the alert settings, then click Test. Browsers block sound a page starts on its own until you have clicked somewhere on the page in that visit, so click once after opening it. The alert also will not repeat within 30 seconds of the last one.

A36: A point is added only when the level or the charging state changes, at most once a minute, so a freshly opened page shows one point until the level moves. Leave the tab open for a while. If the chart area shows a message instead of a chart, the chart script did not load; reload the page.

A37: They pause while a text field or slider has the focus; click on an empty part of the page first. On a Mac use Option for Alt. Some browser extensions reserve Alt combinations; the buttons in the toolbar do the same jobs.

A38: Very little. It reads the battery once a second, stores a point only when something changes and redraws the charts only on the tab you are looking at. Keeping the screen awake is what costs power, because the display stays on; switch it off if you only want the alert.

A39: Settings, Clear all data, then confirm. Every reading, cycle, pattern, profile and setting the tool stored in this browser is removed and the page reloads with the defaults. Export first if you want a copy.