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Black rectangular laptop battery with eight lithium-ion cells for ThinkPad X40 and X41

Battery Technology Inc.

Battery Technology Inc. IB-X40H 8-cell 4400 mAh 14.8 V laptop battery for ThinkPad X40 X41

SKU CH-WEZ3-DEND9 MPN IB-X40H

An 8-cell lithium-ion battery delivering 4400 mAh at 14.8 V for ThinkPad X40 and X41 models

  • Battery type8 Cell Lithium-Ion
  • Battery voltage rating14.8 V
  • Battery capacity4,400 mAh
  • Product typeBattery
  • Compatible withLenovo ThinkPad Notebook Series: X40, X41
  • Key featuresColor: Black
  • 8-cell lithium-ion design delivers 4400 mAh capacity
  • 8 V output matches original ThinkPad specifications
  • Direct replacement for Lenovo X40 and X41 models
  • New condition ensures full performance from first charge
  • Black finish aligns with ThinkPad aesthetic

Compatible ThinkPad models

The Battery Technology Inc. IB-X40H is a replacement power pack built for Lenovo ThinkPad X40 and X41 notebooks. It uses an 8-cell lithium-ion design rated at 14.8 volts and 4400 mAh. The black casing matches the original aesthetic of these legacy machines.

Sustained runtime profile

Eight lithium-ion cells spread the discharge load, keeping voltage stable through a full work session rather than sagging after a short burst. The 4400 mAh capacity targets multi-hour operation on a single charge for typical office workloads. Internal cell balancing supports consistent cycle life over repeated daily use.

Upgrade context and limits

This unit replaces degraded or failed original batteries in X40 and X41 systems, restoring untethered mobility. It does not add capacity beyond the factory specification, so users needing longer unplugged time must carry a spare pack. Buyers with other ThinkPad models or newer series cannot use this battery.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $92.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameBTI
Model nameIB-X40H
Product typeBattery
Power
Battery type8 Cell Lithium-Ion
Battery voltage rating14.8 V
Battery capacity4,400 mAh
Size & build
Shipping weight0.57 kg
Package size300 × 94 × 56 mm
Compatibility
Compatible withLenovo ThinkPad Notebook Series: X40, X41

Questions about this item

Does the 8-cell 14.8V lithium-ion pack run hot or draw extra power during all-day use?

The 8-cell lithium-ion design operates at 14.8 volts and 4400 mAh, matching the original ThinkPad X40 and X41 thermal envelope without added heat or power draw.

What must my ThinkPad already have for this IB-X40H to fit and charge?

It fits directly into the battery bay of a ThinkPad X40 or X41; no extra caddy, adapter or proprietary connector is required.

Will the 4400 mAh capacity work reliably with the original X40 or X41 charging circuit?

Yes, the 4400 mAh 8-cell pack uses the same 14.8V lithium-ion chemistry the X40 and X41 charging circuits were designed for.

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