What size screw does Lenovo ThinkPad battery use?

M2.5 × 4 mm for holds the internal battery pack to the chassis.

How long are the screws in Lenovo ThinkPad battery?

The record gives 4 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

What is the thread pitch of an M2.5 screw?

0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.

What screwdriver do I need for Lenovo ThinkPad battery?

The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.

Can I use an imperial screw instead of M2.5?

No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Lenovo ThinkPad battery?

TechSpareWarehouse (our own store) lists M2.5 x 4mm, which matches the length in the records above.

Lenovo ThinkPad battery screw size

M2.5 · 4 mm long

The screws used on Lenovo ThinkPad battery are M2.5, 4 mm long.

It is listed for holds the internal battery pack to the chassis.

This entry is marked reported and comes from ifixit.com.

For reference, M2.5 is 2.5 mm across the threads at 0.45 mm pitch. The imperial size people confuse it with: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.

Lenovo ThinkPad battery screw specifications

One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.

Thread	Length	Pitch	Head	Drive	Where it goes	Status
M2.5	4 mm	0.45 mm	not stated	not stated	holds the internal battery pack to the chassis	Reported

Fitment records and sources

M2.5~4mmreported

holds the internal battery pack to the chassis

pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8

Source

How to check the screw before you buy

Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.45 mm from one thread crest to the next (22.22 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
The record states 4 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
Tightening: no device-specific torque is published in these records. The site's general figure for M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M2.5

Nylon-coated M2.5 screws (ThinkPad Edge) are thread-locking; plain replacements work loose over time.
Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.

Pitch gauge · Screw size finder · Torque guide

Buy these screws at TechSpare Warehouse

In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.

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The same screw also fits

Devices whose records share a thread with Lenovo ThinkPad battery, closest length match first.

Intel NUC / mini PC internal boards also M2.5 × 4 mm
Dell Inspiron 1100 also M2.5 × 4 mm
Dell Inspiron 14 3490 also M2.5 × 4 mm
HP EliteBook 2530p also M2.5 × 4 mm
Lenovo B50-30 Touch also M2.5 × 4 mm
Lenovo E50-70 also M2.5 × 4 mm
Dell Latitude E7450 also M2.5 × 4 mm
Lenovo B51-30 also M2.5 × 4 mm

Questions about Lenovo ThinkPad battery screws

What size screw does Lenovo ThinkPad battery use?: M2.5 × 4 mm for holds the internal battery pack to the chassis.
How long are the screws in Lenovo ThinkPad battery?: The record gives 4 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
What is the thread pitch of an M2.5 screw?: 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
What screwdriver do I need for Lenovo ThinkPad battery?: The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
Can I use an imperial screw instead of M2.5?: No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Lenovo ThinkPad battery?: TechSpareWarehouse (our own store) lists M2.5 x 4mm, which matches the length in the records above.

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