A used laptop can be a great buy or an expense that drags on for months — the difference comes down to about twenty minutes of checks before you hand over the money. At our shop we open up laptops every week that people bought used through classified ads, so we know exactly where the problems hide: a battery on its last legs, hinges that already cracked and got glued back, a drive throwing errors. Here’s what we check when a laptop lands on the bench, and what you can check yourself before buying.
Why a used laptop makes sense at all
For office work, university, emails and spreadsheets — a laptop from four or five years ago runs perfectly well, especially the business lines. ThinkPad, Dell Latitude and HP EliteBook are built to survive a three-year corporate lease, so after that they still have plenty of life left in them. Their chassis is sturdier, the keyboard is better, and servicing is easier than on cheap new models in the same price range.
The problem isn’t a used laptop as an idea. The problem is that classified ads also sell what’s really fit for the scrap heap, and the buyer only sees it once it’s on our bench.
What to check before buying — the technician’s checklist
1. Battery — ask for the cycle count, not “holds up great”
“The battery holds up great” is the most common line in ads and the least meaningful. On a Windows laptop, open Command Prompt and type powercfg /batteryreport — you get an HTML report with the factory capacity, current capacity and the number of charge cycles. If current capacity is below 70% of factory, count on a battery replacement soon. That doesn’t have to kill the purchase, but it does have to bring the price down — take a look at what a laptop battery replacement involves, then factor it into your calculation.
2. Screen — dead pixels and blotches aren’t obvious at first glance
Run a full-screen white, then black, red, green and blue background one after another (there are plenty of dead-pixel test sites, or simply full-screen images). White reveals dead pixels and yellow pressure blotches, black reveals backlight bleed. Move the screen back and forth while the image is on — if the picture flickers or drops out at an angle, the display cable is damaged or the panel has cracked near the hinge.
3. Hinges — the first thing we look at
On used laptops, hinges are what the timing belt is on a used car. Open the lid with one hand, slowly, through its full travel. If it creaks, catches, or the plastic around the hinge shifts and “breathes” — the hinge mount is already cracked or about to crack. Also check whether the screen bezel is separating at the corners. Sellers often glue that down with super glue to last until the sale; it holds for two weeks. A laptop hinge repair is doable, but it’s better to know that before buying than after.
4. Drive — SMART in five minutes
Bring a USB stick with CrystalDiskInfo (free, no installation required). Run it and watch two things: the overall status (must be “Good”, not “Caution”) and, on an SSD, the wear percentage. On older drives, look at Reallocated Sectors — anything above zero means the drive is already failing bit by bit. If the laptop still has a classic HDD instead of an SSD, that’s not a reason to walk away, but it is a reason to plan an SSD upgrade right away.
5. Keyboard, ports, camera
Open Notepad and press literally every key, including the Fn combinations for volume and brightness. Shiny keys tell you how much the machine has been used, but a dead key tells you a full keyboard replacement is waiting for you. Plug a USB into every port, connect the charger and wiggle the connector — if charging cuts out at a touch, the connector is loose. Check the camera, microphone, speakers and Wi-Fi on the spot.
6. Signs of liquid spills and previous opening
Look at the screws on the underside: stripped heads and missing screws mean someone has already been inside. Greenish traces around the ports and sticky keys are a sign of a liquid spill — run from a laptop like that; corrosion on the board keeps spreading for months after a spill.
Which processor generations make sense in 2026
This is where people go wrong the most, because a laptop with an old processor runs perfectly normally — until you realize it can’t run Windows 11, and Windows 10 is no longer supported.
- Intel: minimum 8th generation (labels like i5-8250U, i5-8350U) — that’s the lower limit for Windows 11. The real choice for the long run is 10th to 12th generation.
- AMD: Ryzen 3000 series as a minimum, Ryzen 4000/5000 (e.g. Ryzen 5 4500U, 5500U) as a very good balance of power and price.
- RAM: 8 GB is the minimum for normal use today, 16 GB if you plan to keep the laptop for another 4-5 years. Check whether the RAM is soldered or can be expanded.
- Drive: NVMe SSD of 256 GB and up.
What to avoid
- Intel before the 8th generation — even if it’s cheap. Without Windows 11 support, you’re buying a machine whose shelf life has already expired.
- Laptops with soldered 4 GB of RAM — no upgrade, no help.
- “It worked until yesterday, just needs a little something” — the little something is, as a rule, the motherboard.
- A laptop without a charger — often a sign it was picked up from a write-off or that charging doesn’t work.
- A BIOS locked with a password — check that you can enter the BIOS before buying; a locked BIOS on business machines can be a serious problem.
- Worn-out gaming laptops — the graphics card and cooling system have been running at the limit for years; with these, always check temperatures under load, not just whether it powers on.
The safest option: a used laptop with an inspection and a warranty
You can check everything above yourself on the ads — and it’s worth it. But if you don’t want to take the risk, buy where the laptop has already been through a service inspection and where you get a warranty in writing. Through rentalaptop.rs we sell used laptops that our technicians open up, clean and test — battery, drive and hinges — before sale, so they go through this very checklist, and each one comes with a warranty. That’s the difference between “buying a pig in a poke” and a normal purchase.
And if you’ve already bought a laptop through the ads and a problem has shown up — hinges, battery, a slow drive — you don’t have to carry it anywhere: our courier picks the laptop up at your address and returns it repaired. Prices for all services are public, on the price list page.
Frequently asked questions
How many battery cycles is too many?
The cycle count alone tells you less than the capacity: a battery with 500 cycles may hold 80%, while another with 300 barely holds 60%. Look at the ratio of current to factory capacity in the battery report — below 70%, count on a replacement.
Is a used business laptop better than a cheap new one?
In most cases, yes. Business models have a sturdier chassis, a better keyboard and are easier to service. A new laptop from the lowest class often has a weaker screen and soldered RAM.
How do I check the drive if the seller won’t let me install programs?
CrystalDiskInfo runs from USB without installation. If the seller won’t allow even that — that’s your answer.
What if the laptop can’t run Windows 11?
Windows 10 no longer gets official security patches, so we don’t recommend a machine without Windows 11 support for everyday use with the internet and online banking. However tempting the price, it’s a short-term purchase.