Yes, nearly all modern laptops use lithium-ion or lithium-polymer batteries
If your laptop was made in the last 15 years, it almost certainly contains a lithium-ion (Li-ion) or lithium-polymer (Li-Po) battery. These are the standard power source for portable computers because they hold more energy in a smaller space than older battery types, charge faster, and lose their charge more slowly when sitting unused.
The only exceptions are very old laptops from the early 2000s or earlier, which used nickel-cadmium or nickel-metal hydride batteries. If you own a laptop made after 2010, you can assume it has a lithium battery. The battery is usually a sealed unit built into the bottom or side of the machine, though some newer models have removable batteries.
Key Takeaways
- Lithium-ion and lithium-polymer batteries are in virtually every laptop made in the last 15 years.
- Lithium batteries hold more charge, weigh less, and last longer between charges than older battery types.
- You can check your laptop's battery type by looking in the system settings or on the physical battery label if it is removable.
- Lithium batteries degrade over time and typically last 300 to 500 full charge cycles before noticeably losing capacity.
- Proper charging habits—avoiding extreme heat and not letting the battery fully drain regularly—can extend the lifespan of a lithium battery.
How to find out what type of battery your laptop has
The easiest way is to check your laptop's system settings. On Windows, go to Settings > System > Battery and device health, or search "battery report" in the Start menu and open Battery Report. This will show the battery name and chemistry type. On Mac, hold Option and click the battery icon in the top-right corner—it will display the battery condition and type.
If your laptop has a removable battery, you can also look at the label printed on the battery itself. It will list the chemistry type (usually "Li-ion" or "Li-Po"), the voltage, and the capacity in milliamp-hours (mAh) or watt-hours (Wh). For sealed batteries, you can also check your laptop's manual or the manufacturer's website by searching for your exact model number.
Why lithium batteries became standard in laptops
Lithium batteries replaced older types because they store much more energy per pound of weight. A lithium-ion cell can hold three times the energy of a nickel-cadmium battery of the same size, which means laptops could run longer without becoming heavier. They also charge in hours instead of overnight, and they do not lose charge as quickly when the laptop sits in a closet for weeks.
The trade-off is that lithium batteries are sensitive to heat and age. They degrade with every charge cycle, and they can catch fire if damaged or overcharged. This is why laptops have built-in circuits that stop charging when the battery reaches full capacity and why manufacturers warn against leaving laptops in hot cars or direct sunlight.
How long a lithium battery lasts in a laptop
A lithium-ion battery in a laptop typically survives 300 to 500 full charge cycles before its capacity drops noticeably. One charge cycle means draining the battery completely and charging it back to 100 percent. If you charge your laptop every day, that works out to roughly one to two years before you notice the battery does not hold a charge as long as it did when new.
The actual lifespan depends on how you use it. Keeping the laptop cool, avoiding deep discharges (letting it drain to zero), and not leaving it plugged in constantly can extend the battery's life. Many people find their laptop battery still holds 80 percent of its original capacity after three years of normal use, and some last five years or longer.
Signs your lithium battery is failing
The most obvious sign is that your laptop does not run as long on a single charge. If a laptop that once lasted eight hours now lasts four, the battery has degraded. Other signs include the battery draining quickly even when the laptop is off, the machine shutting down suddenly even though the battery indicator shows 20 or 30 percent charge, or the battery feeling warm to the touch during normal use.
In rare cases, a failing lithium battery can swell and push against the laptop's case, making the keyboard or trackpad feel uneven or the bottom of the machine bulge slightly. This is a safety issue and means the battery should be replaced when ready—do not try to use the laptop or leave it plugged in. Contact the manufacturer or a repair shop for a replacement.
What to do if your lithium battery is dead or dying
If the battery no longer holds a charge, you have two main options: replace it or use the laptop plugged in. Replacement costs vary widely depending on the model. Some laptops have user-replaceable batteries that cost $30 to $100 and take five minutes to swap. Others require disassembling the entire machine, which can cost $100 to $300 at a repair shop or through the manufacturer.
Before replacing the battery, try a full power cycle: shut down the laptop completely, unplug it, and leave it off for 30 minutes. Then plug it in and let it charge for at least two hours without turning it on. Sometimes the battery's internal circuits reset and the battery works again. If that does not help, contact the laptop manufacturer to ask about replacement options and cost.
How to extend the life of your laptop's lithium battery
Keep the laptop cool. Lithium batteries degrade faster in heat, so avoid leaving your laptop in a hot car, in direct sunlight, or on a soft surface like a bed that blocks airflow. Use a laptop stand or cooling pad if you use the machine for long stretches.
Avoid extreme charge levels. Charging the battery to 100 percent and letting it drain to zero every time stresses the battery more than keeping it between 20 and 80 percent. Many modern laptops have a "battery health" or "battery saver" mode that stops charging at 80 percent—turning this on can add months or years to the battery's life. Also avoid leaving the laptop plugged in all the time; unplug it once it reaches full charge.
Do not let the battery sit completely dead for weeks. If you store a laptop, charge it to about 50 percent before putting it away, and charge it again every few months. A completely drained lithium battery can fail to charge again if left empty too long.
Frequently Asked Questions
Can I replace a lithium battery myself?
It depends on your laptop model. Some have batteries held in with two screws and can be swapped in seconds. Others require removing the keyboard, trackpad, or motherboard. Check your laptop's manual or search "[your model] battery replacement" online to see the difficulty level. If it requires more than removing a few screws, a repair shop is safer and often not much more expensive than the battery itself.
Is it bad to leave my laptop plugged in all the time?
It will not damage the battery when ready, but it does shorten its lifespan. Modern laptops stop charging at 100 percent to prevent overcharging, but the battery still sits at full charge, which causes gradual degradation. Unplugging the laptop once it reaches full charge, or using battery saver mode to cap charging at 80 percent, can extend the battery's life by a year or more.
Why does my laptop battery drain when it is off?
Lithium batteries naturally lose charge over time, especially in warm conditions. Most laptops also draw a small amount of power even when off to keep the clock running and to respond to wake commands. If the battery drains noticeably in a few days, the laptop may have a hardware problem or a background process consuming power. Try shutting down completely instead of sleeping, or contact the manufacturer if the drain is very fast.
What should I do if my battery is swollen?
Stop using the laptop when ready and unplug it. A swollen battery is a fire risk. Do not try to remove it yourself unless you have experience with lithium batteries. Contact the laptop manufacturer or a certified repair shop and explain that the battery is swollen. They will handle the replacement safely. Many manufacturers will replace a swollen battery even if the laptop is out of warranty.
Can I use a third-party battery instead of the manufacturer's battery?
Third-party batteries are cheaper but carry more risk. They may not fit properly, may lack the safety circuits that prevent overcharging, or may fail sooner than the original. If you choose a third-party battery, buy from a reputable seller and check reviews from other users of your exact laptop model. The manufacturer's battery is more expensive but is may provide to work safely.