by on January 28, 2020

All batteries wear out over time, but they don’t wear out at the same speed. You and someone else, given the same brand-new laptop on the same day, could have quite different battery life after two years—maybe as much as a 40 percent difference. It depends on charging levels, heat, how you store it, and avoiding the deadly zero-charge.

Here’s the best advice for keeping your laptop battery running as long as it can on its little pack full of chemicals. Don’t worry if you can’t swear an oath to them: like 8 cups of water a day, or 10,000 steps, they’re guidelines, and your life may have present exceptions. But following as many as you can will yield good results over years of use.

Keep It Between 40 and 80 Percent Charge
Windows laptop showing a 61 percent battery charge.
If you use your laptop away from its charger quite often, try to keep it above 40 percent charge. When it’s time to recharge it, top it off to about 80 percent, if it has decent capacity and you can live with the uncertainty. Using it this way is the best and most obvious way to extend the longevity and charge capacity of your laptop. Unfortunately, it’s also the toughest to follow.

Notebook Akku für Acer Aspire 4743G

This may not be practical for road warriors, the overscheduled, or those who suffer from charge anxiety. But if battery life is generally not a problem for you, or you usually have a charger handy, these are the ideal limits to stay inside. A battery charged to its extremes, from empty to full, can make that trip 300-500 times before burning out, according to Battery University, the highly informative, if archaically organized, depot of battery tips and testing. A laptop battery charged to 80 percent might make it 850-1,500 cycles.HP Elitebook 2570p Battery

Some laptops offer a viable solution to the plugged-in problem. Lenovo’s Vantage app for ThinkPad laptops allows for setting a maximum battery charge threshold, and some Samsung and Sony laptops do as well. Check your laptop manufacturer’s support software to see if you have a charge limiter.

If that last piece advice made you feel guilty, don’t worry about being so basic with your laptop use. Keeping your laptop plugged in regularly, with the battery charged to 100 percent, isn’t slowly killing it, despite what you may read. It’s only as bad as charging it once, to 100 percent, in the first place. Once the battery hits 100 percent, most modern laptops stop charging, and the power is diverted to the system instead.Akku Acer Aspire 7741z

The exception is if your laptop runs hot. This could be because you’re doing a lot of compiling, rendering, or other intensive work, or because it’s hot where the laptop is used, due to sunlight, exhaust, or other factors. When you combine a battery at maximum capacity with serious heat exposure, that’s when it starts taking damage and losing life.

Laptops are not good to keep on your lap. Because of their compact size and lack of large cooling fans, laptops can get quite hot, to the point of causing gradual skin burns, or “toasted skin syndrome.” If non-toasted skin weren’t incentive enough, the heat your thighs create by trapping heat and blocking vents is also killing the laptop battery. As our CEO Kyle Wiens told Wired UK in 2013, extreme heat causes physical expansion and chemical changes in batteries: “Too much heat to the battery over time, and the battery isn’t going to last as long.”

So keep the lid open for a while after the laptop runs hot, and keep it off your thighs, or pillows, or laptop desks that surround it with pillows. Take a look around the laptop, see where the vents are, and avoid blocking them.Akku Acer Aspire 5732

When you’re not using your laptop, keep it someplace cool, away from sunlight or heating vents. A chart on Battery University (third chart down the page) shows lithium-ion batteries kept in different temperatures for one year. A battery kept at a wintry 32 Fahrenheit (0 Celsius) retained 94 percent of its charge capacity, while a laptop at 104 F (40 C) held 65 percent. 86 F (30 C) is the benchmark Battery University recommends to stay under. But keep in mind, that temperature is inside the laptop; if that’s how hot it is in the air, it’s certainly hotter inside.HP Elitebook 720 Battery

That’s the message of the many warnings littered throughout Battery University. “A deep discharge with a full recharge causes undue stress to any battery,” reads one. Another post shows off testing by site sponsor Cadex, with a set of cellphone batteries dropping from 88-94 percent capacity to 73-84 percent capacity after just 250 full discharge-recharge cycles.

The only time you need to let a battery discharge completely is when you install a new battery in a computing device, and it’s for the sake of the device, not the battery. There is no “memory” to reset in lithium-ion batteries, unlike the nickel-cadmium batteries of yore. iFixit recommends draining your phone or laptop completely to calibrate the battery gauge. This is a very small hit to battery longevity, but it gives your device a better estimate of its battery life and percentage remaining over a very long time, and prevents unexpected shutdowns and false readings.Akku Acer v5-531p

iFixit has a wider variety than ever of PC laptop batteries to install in your own laptop, from most of the major manufacturers, along with guides and toolkits to walk you through replacing them yourself. The same goes for MacBooks, whether Pro, Air, or plain MacBook.

A battery is often the easiest thing to replace on most laptops. Even on modern-day ultrabooks, where the battery is no longer replaceable with a push-to-release lever, it’s usually just having the right screwdriver and a little know-how (something in which we specialize).HP Elitebook Folio 9470m Ultrabook Battery

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