Battery Status is a menu bar utility that reports:

• what percent of the battery life is remaining
• when the last time you replaced the battery was
• when the battery is estimated to die

It also offers easy access to some information on the internal battery for laptops, including:

• the battery’s current percent
• an estimate of how long the battery will take to fully charge
• an estimate of how long the battery can last, the number of charge cycles on the battery
• the percent of the design capacity that the battery is currently able to utilize

Additionally, Battery Status has networking capabilities to broadcast and receive the statuses of batteries on other machines on any network.