If you're lucky enough to have a modern laptop with a removable battery — some of Lenovo's ThinkPad line is still offering this feature — consider taking it out and relying solely on the charging cable.No matter what you do to baby your laptop's battery, it's going to naturally see a decline in performance. When you charge a battery to its full potential — which is, in most cases, to about 4.20V per cell in the battery — you can expect to get a set number of charge cycles out of it. Lowering that voltage in each cell, even by a little bit, can potentially prolong the life of your battery, as seen in this chart from Battery University.Many modern laptops have software that helps deal with keeping batteries healthy. Lenovo, for example, comes with a companion app that will can change the charge threshold. Similarly, Dell's power manager has a "Primarily AC" setting that will also lower the threshold to keep the battery from sitting at 100 percent all the time.

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As for some battery basics to keep in mind if you don't have any fancy software, it's generally recommended to keep your battery somewhere between 40 and 80 percent charge and to keep it cool whenever possible.If you've been using your laptop for a few months (or a few years), you might notice that the battery gauge in the bottom-right corner is no longer giving an accurate reading. You might see that you can two hours left, but 30 minutes into your movie, it powers down.A recalibration can likely solve this problem! I've already written a guide on the steps required, and the entire process shouldn't take long.We all know how much manufacturers lie about battery life. In fact, researchers found that 86 percent of them overstate it, often by testing with unrealistic usage conditions. The marketing numbers are unhelpful because you’d never be using Microsoft Office for 14 hours straight!

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You shouldn’t expect a rating to go higher than 100Wh due to lithium-ion flight restrictions. Anything higher needs to be approved by the airline before a flight, so manufacturers aren’t making batteries above that point.Both Windows 10 and Mac OS allow you to see information about your battery. If you’re friendly with salesperson or have a friend with the laptop you’re considering, you can ask to quickly check its battery specifications.Once open, type powercfg /batteryreport. Follow the path it outputs and you’ll find battery-report.html, which you can view in a web browser.Just look for Design capacity and divide the number you see by a thousand. If there’s a difference between Design capacity and Full charge capacity, then the battery on the laptop you’re on has worn out slightly.