Free 3.6v lithium battery software for linux

Wmbattery displays the status of your laptops battery in a small icon. This includes if it is plugged in, if the battery is charging, how many minutes of battery life remain, battery life remaining (with both a percentage and a graph), and battery status (high - green, low - yellow, or critical - red).
Theres nothing in the program that makes it require WindowMaker, except maybe the look. It can be docked in WindowMaker or Aftersteps dock.
Wmbattery is based heavily on wmapm by Chris D. Faulhaber.
Enhancements:
- Improved icon layout. I crammed the same information into less space while making the icon more elegant and visually pleasing (IMHO).
- Easier to drag onto dock.
- It consumes a little less memory.
- Uses only 10 colors.
- ACPI support, including multiple battery support and battery charging completion countdown timer.
- Support for getting battery status from the sonypi driver instead of APM, for some Sony laptops that do not have apm support.
- Can make its own estimatess of time remaining or time until full charge, even if APM does not.

Battery OSD is a program that displays battery information and other types of system information on screen with the OSD library.

Xfce 4 Battery Plugin is a battery monitor panel plugin for Xfce4, written by Nick Penwarden and Edscott Wilson Garcia, compatible with APM and ACPI, for Linux and *BSD.
Usage:
- Compile or install xfce4-battery-plugin
- Right-click the panel > Add New Items
- Add the Battery Monitor
- Right-click plugin > Properties for the properties dialog

battery_monitor is a small battery monitoring program for Linux, that you can run in the background from your desktop session or launch from the boot scripts. battery_monitor is designed with simple goals in mind and provides acoustic and/or visual alerts when your battery level is low or when it is fully charged, so you can take apropiate actions.
Compilation and installation
To compile and install battery_monitor you need several components installed on your computer:
C compiler (probably GCC) and the standard C libraries and headers.
POSIX threads libraries and headers (pthread.h).
X11 libraries and headers.
xine libraries and headers.
make tool.
To compile the program, once you have installed everything needed, run make from the source code directory. To install it, run make install after compilation. This last step may require superuser privileges depending on the selected installation directory. The following parameters may be useful while compiling and installing:
CC: It lets you specify the C compiler name instead of gcc.
CFLAGS: You can use it to change the optimization level and/or specify additional header directories by using extra -I arguments.
LDFLAGS: In case the compiler cant find some of the required libraries, use this parameter to pass additional -L arguments in the link step.
PREFIX: The default prefix is /usr/local. If you change this parameter you should change it in both the compilation and the installation step. Its only used in the installation step for now, but this may change.
DESTDIR: Useful for package maintainers, this lets you specify a fake root directory in the installation step.
Compilation and installation parameters are appended to the make command in variable assignment form. For example: make install PREFIX=/usr DESTDIR=/tmp/fake_rootdir.
Enhancements:
- Several bugs have been corrected.
- They surfaced with recent releases of the Xorg X server, and made the program behave incorrectly when displaying signs.
- The underlying sign code has been rewritten, and the program is now lighter on resources as a collateral effect. In addition, CMake support has been added to the build system.

light-monitor is a transparent panel that depends only on X and Xft. The project comes with light-calendar, a simple, transparent, and lightweight calendar.
These two programs are written to consume the lowest possible amount of resources.
Main features:
- vol Manages the volume (pcm and vol). To change the current volume just clic on it or use the mouse-wheel.
- cpufreq Manages the scaling_governor : blue means powersave, blue and green means ondemand, and blue green and red stands for performance. To change to the next one, just clic on the processor
- load Shows the current load on the system and the processor temperature
- time Shows the time
- date Shows the date
- network Shows the cumulative bandwidth over all network interfaces except lo. It is hidden if current upload and download are null
- ac Shows if the power supply is plugged for laptop
- battery Shows the current percentage of remaining charge in the battery if it is not full. IF ac is unplugged, it shows an estimation of the remaining time too.
Light-calendar
light-calendar is a simple, transparent, and lightweight calendar (12Ko). It is distributed under the license GPLv2.
To see the next month, click on the right arrow. The previous month is accessible using the left one. To come back to the current month, use the o between the two arrows. You can move it by dragging it outside those buttons.
Enhancements:
- The semantic of buttons were changed.
- Now when a button is clicked, its window is redrawn.
- A bug in the config file reader that sometimes duplicated the last widget was fixed.
- The cpufreq applet is now more reactive.
- The README was updated.

baterry monitor is a Slovakian ACPI based baterry monitor version with autoconfiguration and support for more then one battery.

KToshiba is a battery and Fn-key monitoring for Toshiba laptops, but it does much more than that. KToshiba lets you configure the Fn-F# combinations with the supported options to let you have a complete and fully customizable setup for your specific model, and lets you use those special multimedia keys found on the front panel (prev, next, play/pause, stop), plus some others found on newer models.
It also features a Grapical User Interface (UI) higly integrated with KDE a powerful Desktop Environment, and a configuration module available through the Control Center or directly from the application panel menu.
All of these coulnt be done without the work of Jonathan Buzzard and his Toshiba utilities.
Main features:
- Battery status monitoring (including AC status)
- Monitoring of MultiMedia keys on front panel (if available)
- Mute/Unmuting (via KMix)
- Lock Screen (via DCOP call)
- Battery Save Mode options
- Suspend to RAM (via ACPI, if available)
- Suspend to Disk (via ACPI, if available)
- Video Out toggling (for the moment only a widget displays status, since some models do it automatically)
- Raise/Lower LCD Brightness
- Control Wireless Antenna power (On/Off), and monitor switch status (On/Off)
- MousePad enabling/disabling (via ksynaptics and synaptics driver, if available)
- Control of Speaker volume (for models that do it via hotkey)
- Control the Fan status (On/Off)
- Selection of desired Boot Priority
- Control LCD Backlight (On/Off)
- Control Bluetooth device (On, if available)
- Control CPU Frequency Scaling via SpeedStep(r) (if available)
- Control Hyper-Threading(r) support (if available)
- More to come... (hopefully)
Enhancements:
- Suspend support now uses HAL
- KToshiba is now able to run commands using Fn-Keys
- New model IDs added
- KToshiba now requires libsynaptics

KBatt is a cute little notebook battery applet for your KDE panel.

It uses the APM interface in your kernel to show a cute little display on your panel: you can see the AC status, the battery level, and how much time you have left.

Build & install:

run ./configure
make
make install (as root)
add the applet to your KDE panel & enjoy!