How many spare POC batteries can I bring on a plane?

For batteries under 100 Wh (which covers most Inogen and OxyGo single and double batteries), the FAA sets no numerical limit—but you must be able to physically carry them. Use the 150% rule based on your total transit time to determine the exact number you need.

Can POC batteries go in checked luggage?

No. All spare lithium-ion batteries must be in your carry-on baggage. Only the battery currently installed in the device may be in checked luggage (inside the device). This rule is non-negotiable under FAA Advisory Circular AC 120-76E.

Where is the Lenovo / ThinkPad battery FRU number?

Lenovo battery part numbers, and FRU (Field Replaceable Unit) numbers on ThinkPad packs, are printed on the battery label — visible once the bottom cover is off on internal batteries. Match the part number, voltage and connector exactly. Where a model offered multiple capacities, the part/FRU number tells you which one fits.

Can I install a higher-capacity Lenovo battery?

Yes, as long as part-number compatibility, voltage and connector match your original. A higher Wh rating at the same voltage gives longer runtime. Never change the voltage to chase capacity.

Is it worth replacing a ThinkPad battery or buying a new laptop?

If the laptop is otherwise healthy and only the battery is failing, replacing it is far more cost-effective — about $40–150 versus several hundred for a new machine, and you avoid migrating files and apps. ThinkPads in particular are built to last, so a new battery often adds years. Consider a new laptop only if it's also slow, low on storage, or facing other costly repairs.

How long does a Lenovo laptop battery last?

Most last about 2–4 years, or roughly 300–500+ charge cycles, before capacity drops noticeably. Heat, heavy use, and sitting at 100% shorten it. Lenovo Vantage's battery settings, including a charge threshold, can extend lifespan.

Will a third-party Lenovo battery void my warranty?

Using a compatible aftermarket battery on its own does not void your warranty. If a poor-quality pack causes damage, coverage for the affected parts can be at risk — which is why cell quality, a proper BMS, and certifications matter. ThinkPad and IdeaPad have robust battery management, so a quality replacement behaves like the original.

Lenovo Laptop Battery Replacement: ThinkPad, IdeaPad & Legion

June 26, 2026 Cao Chuanping

If your Lenovo — especially a hard-working ThinkPad — is dying early or won't hold a charge, a new battery brings it back for a fraction of the cost of a new machine. With Lenovo, getting the right pack comes down to your model and part number (or, on ThinkPads, the FRU number). ThinkPad lines in particular offered multiple battery options per model, so the code is what matters. Here's how to confirm it, then install with confidence.

Already know your part / FRU number?

Jump straight to compatible Lenovo batteries and check the code against your label.

Shop Lenovo batteries

Does your Lenovo actually need a new battery?

Before ordering, a quick check that the battery — not something else — is the issue. A replacement is the right fix if you recognize one or more of these:

Signs the battery is the cause, and what each one means.
What you're seeing	What it usually means
Runtime collapsed — hours have become minutes	Cells have lost capacity with age; the classic replacement trigger
Early shutdowns — powers off at 20–60% showing	Voltage drops under load before the charge "runs out"; worn cells
"Plugged in, not charging" or charge stuck	Often a worn pack or a firmware/handshake issue — try this fix first
Lenovo Vantage flags poor battery health	Vantage's battery report shows capacity well below design; time to plan a swap
Swelling — trackpad lifting, case bulging, won't sit flat	A safety hazard — stop using it and replace immediately

Want numbers? On Windows, run powercfg /batteryreport and compare full charge capacity with design capacity, or open Lenovo Vantage for a built-in battery health view. Below roughly 60–70% of design means a replacement will restore your runtime.

Swelling is the one to act on now. A bulging battery can damage your laptop and is a fire risk. Power down, stop charging, avoid pressing the palmrest or touchpad, and replace it promptly — recycle it at an e-waste point, never in household trash.

How to confirm your Lenovo laptop model

Lenovo laptops carry a model name (for example ThinkPad T14 or IdeaPad 5) and a machine type model (MTM) number on the underside label. The MTM is the most precise identifier — Lenovo's support site uses it to show the exact battery your configuration shipped with, which matters because ThinkPad lines in particular offered multiple battery options.

How to find your Lenovo battery part number (FRU)

Lenovo battery part numbers — and FRU (Field Replaceable Unit) numbers on ThinkPad packs — are printed on the battery label. Match the part number, voltage and connector exactly. Many ThinkPad models offered a choice of battery capacities (for example a standard and an extended pack), so the part number is what tells you which one fits your machine.

Match the part/FRU number, voltage and connector for a guaranteed fit. A higher-capacity replacement is fine as long as voltage and connector match — never change the voltage.

Common Lenovo battery part numbers by model

To speed up matching, here are some of the most common Lenovo battery codes and the families they're used in. Lenovo often offered more than one battery per model, so the exact code on your label is always the final word — find your code below, then confirm it against the pack in your machine.

Frequently seen Lenovo battery part / FRU numbers. Always confirm against the code on your own battery.
Battery code	Voltage / capacity*	Commonly used in
`L18C3P72` (& L18M3P73)	11.55V / ~51Wh	ThinkPad T490, T495, T14 & P14s Gen 1/2, P43s
`L21M4P72` (& L21C4P71)	15.36V / ~52.5Wh	ThinkPad T14 & P14s Gen 3/4
`5B11M90030`	15.36V / ~57Wh	ThinkPad T14s Gen 3/4
`01AV494` (& 01AV429/30/31)	11.52V / ~57Wh	ThinkPad X1 Carbon 5th (2017) & 6th (2018)
`L17C4P72` (& L18M4P71)	15.36V / ~80Wh	ThinkPad X1 Extreme & P1 Gen 1/2
`L19C3PF6` (& L19L3PF4)	11.25V / ~42Wh	IdeaPad 3-17 (ADA05/ARE05/IIL05/IML05), V17
`L19L4PF1` (& L19M4PF1/C4PF1)	~15.36V / ~70Wh	IdeaPad 5-15 (IIL05/ARE05/ITL05)
`L20C4PC0` (& L20M4PC0/D4PC0)	15.36V / ~60Wh	Legion 5-15 & IdeaPad Gaming 3-15 (ACH6/ITH6)
`L20C4PC1` (& L20M4PC1)	15.36V / ~80Wh	Legion 5 Pro-16, Legion 7-16 (ACH6/ITH6)

*Voltage and capacity are typical values for the most common version of each pack; many ThinkPads shipped multiple capacities. The leading letter of an L-series code (e.g. L20C4PC0 vs L20M4PC0) denotes the cell vendor — these are cross-compatible within the same model.

Can't find your exact code? That's normal — Lenovo has a huge FRU catalogue and this is a shortlist of high-volume ones. Send us the code on your label and we'll confirm the match.

Lenovo battery by sub-series

Lenovo battery compatibility groups by line. Confirm by part/FRU number after narrowing here.

Lenovo lines and how their batteries differ. Always confirm the exact code for your unit.
Lenovo line	What to know
ThinkPad (business flagship)	Very large range, multiple FRU numbers and capacity options per model — the highest-search Lenovo battery segment (T, X, L, E, P series)
IdeaPad (consumer mainstream)	High-volume, internal batteries by generation
Legion (gaming)	High-capacity internal packs (often 60–80Wh)
Yoga (convertibles)	Slim, model-specific batteries
ThinkBook & Chromebook	Their own dedicated parts

How to install a Lenovo laptop battery

Most modern Lenovo laptops, including current ThinkPads, use an internal battery. The process is straightforward, done powered-down:

Power off and unplug the laptop completely.
On a ThinkPad, disable the internal battery in BIOS if prompted (this protects the board during service).
Remove the bottom-cover screws and release the clips.
Disconnect the battery cable from the board — pull the connector, not the wires.
Unscrew the pack, lift it out, seat the new one, and reverse the steps.

Older ThinkPad and IdeaPad models use an external latch-release battery that swaps in seconds with no tools. (The classic ThinkPad T480 is a special case — it has both a quick-swap external battery and an internal one.)

Work powered-down and keep metal tools away from the board. If you'd rather not open the chassis, a technician can fit it quickly — and check warranty status first, since opening some models can affect coverage.

Buying a replacement Lenovo battery

Once the part or FRU number is matched, you're choosing between an OEM Lenovo pack and a quality-tested aftermarket equivalent. A good aftermarket battery uses Grade A cells and a proper BMS and meets the original spec, at a lower price than OEM. Browse compatible options in our Lenovo battery collection and check the number on your label before ordering.

If your ThinkPad offered multiple capacities and you're unsure which you have, our guide on laptop battery replacement explains how to identify the right battery by model and part number.

Send us your Lenovo model (or ThinkPad FRU number) via WhatsApp and we'll confirm the exact match before you order — or go straight to the Lenovo battery collection. Every pack ships with Grade A cells, a proper BMS, certifications, and a warranty.

Frequently asked questions

How do I find my Lenovo model and battery?

A model name and a machine type model (MTM) number are on the underside label. The MTM is the most precise — Lenovo's support site uses it to show the exact battery your configuration shipped with.

Where is the FRU / part number?

On the battery label (FRU on ThinkPad packs), visible once the bottom cover is off. Many models offered multiple capacities, so match the part/FRU number, voltage and connector exactly.

Can I install a higher-capacity battery?

Yes, if part-number compatibility, voltage and connector match. Higher Wh at the same voltage means longer runtime. Never change the voltage.

How much does a Lenovo battery replacement cost?

Usually around $40–90 for common ThinkPad/IdeaPad packs, more for Legion or premium models. Genuine Lenovo costs a premium; quality aftermarket is cheaper. Shop installation adds roughly $30–60 labor.

Worth replacing a ThinkPad battery or buying new?

If the laptop is otherwise healthy, replacing the battery is far cheaper — about $40–150 vs several hundred for a new machine — and ThinkPads are built to last, so it often adds years. Buy new only if it's also slow or facing other repairs.

How long does a Lenovo battery last?

About 2–4 years, or ~300–500+ cycles. Heat and constant 100% shorten it. Lenovo Vantage's charge-threshold setting can extend lifespan.

Will a third-party battery void my warranty?

Using a compatible aftermarket battery alone doesn't void it. If a poor-quality pack causes damage, coverage for affected parts can be at risk — so cell quality, BMS, and certifications matter. ThinkPad/IdeaPad battery management is robust.

Do I need to disable the battery in BIOS on a ThinkPad?

Many modern ThinkPads prompt you to disable the internal battery in BIOS before disconnecting it, to protect the board. Follow the prompt or your model's maintenance manual. Older latch-release ThinkPads don't need this.

Back to blog