Most laptop batteries unscrew or slide out from the bottom, and you can buy a replacement online for $30 to $150
Replacing a laptop battery is one of the few repairs you can do yourself without tools beyond a screwdriver. The battery sits in a compartment on the underside of your machine, held in place by one or two screws or a latch. You remove it, order a matching replacement from the manufacturer or a parts supplier, and install the new one. The whole job takes about 10 minutes once the new battery arrives.
The hardest part is finding the right battery model for your specific laptop. Every manufacturer uses different part numbers, and ordering the wrong one means a return and a delay. The easiest way to get the correct part number is to look at the battery already in your laptop—the model is printed on the label.
Key Takeaways
- Your laptop model and battery part number are printed on the battery itself, usually on a label on the bottom of your machine.
- You can buy replacement batteries directly from the manufacturer's website or from parts retailers like Amazon, Newegg, or eBay, typically for $30 to $150 depending on the model.
- Most batteries are held in by one or two screws or a plastic latch—no soldering or special tools required.
- Before you remove the old battery, shut down your laptop completely and unplug the power adapter to avoid electrical shock.
- If your laptop is still under warranty, replacing the battery yourself may void it; check your warranty terms first.
Locate your battery model number before you order
Turn your laptop upside down and look for a removable panel or battery compartment on the bottom. If you see a battery sticking out, you have found it. The battery itself has a white or silver label printed with the model number, part number, voltage, and capacity in milliamp-hours (mAh).
Write down the full part number exactly as it appears. This is the number you will search for when ordering. For example, a Dell battery might be labeled "WGCW6" or a Lenovo might be "L17M3P51". Do not rely on your laptop model number alone—two machines of the same model sometimes shipped with different batteries.
If the battery is not visible from the outside, your laptop may have an internal battery that requires opening the case. Check your laptop's manual or the manufacturer's support website for your specific model. If the manual says the battery is internal and non-user-replaceable, you will need to take the machine to a repair shop or the manufacturer.
Shut down and disconnect power before touching anything
Close all open programs and shut down your laptop completely. Do not just put it to sleep—actually power it off. Once the screen is dark, unplug the power adapter from the wall and from the laptop.
Wait 30 seconds. This drains any residual charge in the system and reduces the risk of electrical shock when you touch the battery. If your laptop has a removable battery compartment, you can now proceed. If you need to open the case, wait a few more minutes to let any heat from the processor dissipate.
Remove the old battery by unscrewing or unlatching it
Look at the battery compartment on the bottom of your laptop. You will see either one or two screws holding the battery in place, or a plastic latch on one end. If there are screws, use a Phillips-head screwdriver (usually size #0 or #1) to remove them. Keep the screws in a small cup or on a piece of tape so you do not lose them.
If there is a latch instead of screws, push or slide it away from the battery. The battery should pop up slightly or slide out. Gently pull the battery toward you and lift it out of the compartment. Be careful not to yank on any cables—most batteries are held in by the screws or latch alone, but some older models have a connector you need to unplug first.
If you feel resistance, stop and look for a cable. Unplugging it is straightforward: pinch the connector gently and pull straight out. Do not twist or bend it.
Order the correct replacement battery online
Search for your battery part number on the manufacturer's official website first. Dell, Lenovo, HP, Apple, and Asus all sell replacement batteries directly. Prices are usually $40 to $120 depending on the model and capacity. Shipping takes 3 to 7 business days.
If the manufacturer is out of stock, try Amazon, Newegg, or eBay. Read the product description carefully to confirm the part number matches exactly. Check the seller's return policy in case the battery does not fit. Avoid unusually cheap listings—counterfeit batteries exist and can damage your laptop or fail quickly.
When your battery arrives, inspect the label to confirm the part number matches the one you wrote down. If it does not, contact the seller before installing it.
Install the new battery and test it
Place the new battery into the compartment, aligning it the same way the old one sat. If there is a connector cable, plug it in first—push the connector straight in until you hear a small click. Then screw the battery down or engage the latch. Tighten the screws firmly but do not over-tighten, which can crack the plastic case.
Plug the power adapter back in and press the power button. Your laptop should start normally. Once it boots, check the battery icon in the system tray (bottom right on Windows, top right on Mac). It should show the battery charging. Let it charge for at least 2 hours before unplugging.
If the battery does not charge or your laptop does not recognize it, shut down again, unplug the adapter, and reseat the battery—remove it and reinstall it to make sure the connection is find. If the problem persists, the battery may be defective and you should contact the seller for a return.
When to take your laptop to a repair shop instead
If your laptop has an internal, non-removable battery, you will need professional help. This is common in newer ultrabooks and some gaming laptops. The repair shop will need to open the case, disconnect the battery from the motherboard, and install a new one. This costs $80 to $200 in labor plus the battery itself.
If your laptop is still under warranty, check the terms before you replace the battery yourself. Some manufacturers void the warranty if you open the case. If you are unsure, contact the manufacturer's support line and ask whether a user-replaceable battery replacement will affect your coverage.
If you damage the connector, crack the case, or strip a screw during removal, a repair shop can fix it, but it will cost more than the battery alone. If you feel uncomfortable opening your laptop, it is better to pay for professional installation than to risk damage.
Frequently Asked Questions
How long does a laptop battery last before it needs replacing?
Most laptop batteries degrade after 2 to 4 years of regular use. You will notice the machine shuts down sooner after unplugging, or the battery icon shows a warning even when plugged in. If your laptop is older than 3 years and the battery drains in under an hour, replacement is likely due.
Can I use a third-party battery instead of the manufacturer's?
Yes, as long as the part number matches exactly. Third-party batteries from reputable sellers like Anker or Lenovo-certified resellers work fine. Avoid very cheap knockoffs—they may have lower capacity, shorter lifespan, or safety issues. Read reviews before ordering.
What should I do with the old battery?
Do not throw it in the trash. Lithium batteries are recyclable and contain materials that can harm the environment. Take it to an electronics recycling center, a Best Buy (which accepts batteries for free), or mail it back to the manufacturer if they offer a return program.
Will replacing the battery myself void my warranty?
It depends on the manufacturer and the warranty terms. Some warranties cover battery replacement as normal wear and tear. Others void coverage if you open the case yourself. Check your warranty document or call the manufacturer's support line before you start.
What if my laptop does not recognize the new battery after I install it?
First, shut down completely, unplug the power adapter, and wait 30 seconds. Remove the battery and reinstall it to reseat the connection. Plug in the adapter and power on. If the battery still is not recognized, try updating your laptop's BIOS or battery drivers from the manufacturer's website. If that does not work, the battery may be defective and you should contact the seller for a return.