Dear Lifehacker, My laptop battery doesn’t last very long anymore. How can I tell what’s going on or wrong with it and if it needs replacing? Thanks, Need A Battery BoostPhoto by DeclanTM
Laptop batteries do indeed get weaker and have limited lifespans (generally under three years, though newer laptop batteries are coming out that last much longer). You don’t say how old your laptop battery is, but here are a few resources and tips to give it a checkup.
Testing and Monitoring Your Battery: Windows
Testing and Monitoring Your Battery: Mac
If you’re using a Mac, we’ve described a tip before for using the built-in System Profiler (under Applications > Utilities) and go to “About this Mac” where you’ll find information about the battery’s health in the Power section.
If you want to use a software program for monitoring your Mac laptop’s battery health, we’ve recommended iStat Menus previously. The application provides detailed battery state info as well as advanced information for other OS X system properties.
What to Look For
If your laptop battery only holds about 50 per cent try conditioning or recalibrating the battery (below). If it’s 25 per cent or less, consider buying a new one. Of course, also take age into account – a really old laptop battery will just need replacing.
Recalibrating Your Laptop Battery
Windows users can use a tool called BatteryCare, which not only monitors your discharge cycles but can also recommend when to calibrate your battery. For Mac users, Watts ($US6.95) is a similar application with a reminder for when to calibrate, Growl notifications, and calibration assistance.
Maximising Your Battery Life
That’s all well and good, you’re probably thinking, but after monitoring your battery life, if you’re still having poor running times and your laptop battery looks healthy, there are some things you can do to maximize your battery life: switch to a power saver or balanced power plan, decrease the screen brightness, keep your laptop cool, and use hibernate mode. For more detailed descriptions of these suggestions and other tips, see our guide to extending your battery life.
PS There are many other battery resources and tips out there. Care to share your own?