Battery & Power

Check how much life your laptop battery has left — and tune the power settings that quietly affect performance.

Battery Overview

On laptops, TuneBit reads the battery's built-in health statistics and calculates how it compares to when the laptop was new. The key numbers:

Charge Level — current % and whether it's plugged in or on battery.
Design Capacity — how much energy the battery was designed to hold when new (in mWh).
Full Charge Capacity — how much the battery actually holds now, after aging.
Battery Health — Full Charge ÷ Design, as a percentage. Above 80% is healthy; below 60% the battery is well past its prime.
Chemistry — Li-ion, LiPo, etc.
Cycle Count — how many full charge cycles the battery has been through. Most laptop batteries are rated for 300–500 cycles.
Estimated Runtime — Windows' best guess based on current usage.

On desktops (or PCs without a battery), this panel shows No battery detected and the page focuses on power-plan settings instead.

Power Configuration

Windows exposes several power-related settings that can dramatically affect performance, wake behavior, and boot time. They live in different parts of the Control Panel; TuneBit shows them all together.

Active Plan & Available Plans

Which power plan is currently in use (Balanced, Power saver, High performance, Ultimate) and a list of every plan available on your PC. Some plans are hidden by default; TuneBit shows them all.

Fast Startup

A Windows 8+ feature that speeds up boot by saving part of the Windows state to disk at shutdown (a mini-hibernation). Great for old hard drives; on modern SSDs it saves only a couple of seconds and can cause problems with dual-boot systems, BIOS updates, and some drivers. Many power users leave it off.

Hibernate

Whether hibernation is enabled. Hibernate saves your full session to hiberfil.sys on the C: drive (a file the size of your RAM). Disabling hibernate reclaims that space — a nice win if your C: drive is small and you never hibernate.

Sleep

Whether sleep is allowed, and the timeout values. Sleep uses a tiny trickle of power to keep RAM alive so the PC wakes instantly. Modern "Modern Standby" laptops implement this differently and can drain battery overnight if the firmware is buggy.

Actions

Generate Battery Report

Runs Windows' hidden powercfg /batteryreport command and opens the HTML report it produces. This is Windows' most detailed view of battery history — daily usage, cycle counts, and capacity trends over the life of the machine. A great record to keep with your laptop's paperwork.

Refresh / Export

Re-reads all the values, or saves the page contents to a text file.

How to use it

Go to Info → Battery & Power.
Glance at the Battery Health percentage. Anything above 80% is fine; below 60% the battery is ready to be replaced.
For a detailed health history, click Battery Report.
If Fast Startup or Hibernate is eating disk space you need, change them in Control Panel → Power Options → Choose what the power buttons do.

Extending battery life:

Don't let the battery discharge to 0 % regularly.
If you keep the laptop plugged in 24/7, use the manufacturer's charge-limit setting (Dell, Lenovo, ASUS etc. all have one) to cap charging at 80%. Going from 100% to 80% as a maximum roughly doubles battery lifespan.
Heat kills batteries. Don't leave the laptop in a hot car or run it on a fluffy blanket that blocks the vents.

Swollen battery? If your laptop's trackpad or keyboard starts lifting or the case looks bulged, stop using the laptop and get the battery replaced. A swollen lithium battery is a fire risk and can rupture.