The used-laptop market rewards people who know which models fail and how. Specifications in a listing are a sales pitch; the model number tells you what breaks, what a part costs, and whether the seller’s story holds up. Work in that order and you pay less for a better machine.
Choose a retired business model, then the listing
Corporate leases dump thousands of identical machines on the market at once, which is why a three-year-old ThinkPad costs less than a new entry-level laptop built to half the standard. Current asking prices for clean units:
- Lenovo ThinkPad T480, i5-8350U, 16 GB, 256 GB NVMe: 180 to 240 dollars, or roughly 25,000 to 30,000 taka.
- Dell Latitude 7490, same generation: 190 to 230 dollars.
- HP EliteBook 840 G5: 170 to 220 dollars, the cheapest of the three and the weakest speakers.
- ThinkPad T14 Gen 2, i5-1145G7: 330 to 420 dollars.
For that money you get a service manual, Phillips screws instead of glue, socketed RAM on most variants, and a keyboard you can swap in twenty minutes for 2,500 taka. You give up warranty, and on the oldest units a battery worth keeping.
Known faults, by model number
Each of these is documented and searchable. Asking the seller about one tells you whether the machine was maintained, and whether they know what they are selling.
ThinkPad T480 and T480s. The Thunderbolt 3 controller can fail permanently if its firmware was never updated, and the symptom is nasty: USB-C charging stops and docks go dead. Check the firmware version in Lenovo Vantage or the Thunderbolt software before you pay. The T480 also carries two batteries, an internal one and a removable external pack, and both degrade independently.
Dell XPS 15 9550 and 9560. The battery swells and bows the trackpad upward until clicks stop registering. Stand the closed laptop on a flat table and press a corner; a machine that rocks has a swollen cell. Replacement cells are cheap, but a swollen battery that has been pressing on the chassis for a year can warp it.
MacBook Pro 13-inch, 2016 to 2019. The butterfly keyboard fails from dust, and the display flex cable on the non-Touch Bar 2016 and 2017 models wears through at the hinge, producing “stage light” bright spots along the bottom edge.
HP EliteBook 840 G5. The display cable runs through the hinge and loosens, so the panel flickers as the lid moves. Watch the screen while you open it.
Any Microsoft Surface Laptop. The battery is glued under a bonded display, so a cheap Surface with a tired battery is close to disposable — see the Surface Laptop teardown before you consider one.
Five free tools, fifteen minutes
Bring a USB stick with these on it, or ask the seller to let you install them. All are free and none require an account.
- CrystalDiskInfo. Shows power-on hours and total host writes next to a health verdict. A drive with 40,000 hours has done a decade of office work. Under 30,000 hours is normal for a lease return; a “barely used” listing showing 60,000 is not.
- HWiNFO64. Watch CPU package temperature at idle. A T480 should sit between 40 and 50 degrees. Anything at 60 plus while nothing is running means dust in the fins or dried thermal paste.
- Cinebench R23. One run takes ten minutes and gives you a number to compare. An i5-8350U scores around 3,300 multi-core when healthy; a machine that throttles to 1,800 has a cooling problem you will inherit.
- MemTest86. A single pass on 8 GB takes about twenty minutes and catches bad RAM that Windows will happily ignore until it bluescreens.
- The manufacturer’s own battery report. On Windows, run
powercfg /batteryreport /output %USERPROFILE%batt.htmland open the file. Design capacity against full-charge capacity gives you a percentage; below 70 percent means a new cell, which is 4,000 to 6,000 taka on a business model and impossible on a glued one.
Turn the findings into a price
Battery under 70 percent: subtract 60 dollars, or the local cost of a replacement. No charger: subtract 25 dollars, because a 65 W USB-C brick is 30 dollars on its own. 8 GB of soldered RAM on a machine you cannot upgrade: subtract 80 dollars, since you are buying a ceiling. A visible bright spot or pressure mark on the panel: subtract 40 dollars and expect to live with it, because panel swaps on thin laptops cost more than the machine is worth.
Budget the upgrades yourself, not in the seller’s price: 1 TB NVMe around 5,500 taka, a fresh battery 4,500, a spare 65 W charger 3,000. A 220-dollar T480 with all three fitted still undercuts a new mid-range laptop and outlasts it.
Walk away from these
A BIOS or supervisor password prompt you cannot clear, since some business models need a paid service to reset it. A peeled or missing serial sticker. A seller who will not allow ten minutes with a diagnostic tool. A machine that smells of smoke, because the fan shroud keeps it. A “refurbished” unit whose drive shows more hours than its case does, which usually means two machines were combined.
Buy from a seller with a return window when the premium is under ten percent; the option to hand it back is worth more than the discount. For the physical inspection sequence, our fifteen-point check covers the ports, hinges and screen tests in order. Once it is yours, treat the battery well from day one — the habits in our battery longevity guide add a couple of years to a pack that is already half worn.