GHU 48Wh Replacement Battery for Lenovo ThinkPad T400 R400

GHU's 33+ 48Wh replacement battery restores portable power for older Lenovo ThinkPad models like the T400, R400, R61 and T61 so you can work unplugged again.

Designed as a direct replacement for factory packs, this GHU battery delivers 48 Wh (approximately 4400 mAh) of capacity and fits many legacy IBM/Lenovo part numbers (including 43R2499, 42T4644, 41U3198, 42T4677 and others). It’s built to physically match the original battery bay and provide predictable run time and charging behavior on compatible 14-inch widescreen ThinkPad notebooks.

Will this battery physically fit my Lenovo T400 or R400?

Yes — the GHU 33+ battery is made to the same dimensions and connector layout as the original packs used in the T400, R400, R61 and T61 families. It is compatible with many OEM part numbers so installation is plug-and-play on matching models.

• Fits Lenovo ThinkPad models: T400, R400, R61, T61 and compatible variants.
• Cross-references OEM numbers like 43R2499, 42T5225, 41U3196 and more.
• Designed for 14-inch widescreen ThinkPad notebooks.
• Connector and latch align with original battery bays for easy swap-in.

How much run time and power can I expect from the 48 Wh GHU battery?

The pack provides 48 watt-hours (about 4400 mAh), which gives reliable runtime depending on your system configuration and workload. Light web browsing and document editing will achieve several hours; heavier tasks or high brightness will reduce that time proportionally.

• Rated capacity: 48 Wh / ~4400 mAh for consistent energy delivery.
• Suitable for typical productivity use — email, office apps, web tasks.
• Actual life varies with CPU load, screen brightness, and peripherals.
• Fast-charge compatible to shorten time between sessions.

Is the GHU replacement battery safe and reliable?

GHU batteries undergo safety testing to meet common product safety standards and are manufactured with protection circuits to guard against overcharge and short-circuit conditions. These measures help ensure predictable behavior when used with approved Lenovo ThinkPad systems.

• Built-in protection circuitry for stable charging and discharging.
• Manufactured and tested to recognized safety benchmarks.
• Intended as a direct replacement for compatible models; follow manufacturer charging guidelines.
• Install by powering down and removing the original battery first for a safe swap.

How easy is installation and setup on my ThinkPad?

Installation is straightforward: power off the notebook, unlock and slide out the original pack, then align and snap the GHU battery into place. The laptop will recognize the new battery and report charge status via the operating system or BIOS battery indicator.

• No special tools required — standard battery latch removal.
• Immediate plug-and-play recognition by ThinkPad power management.
• Supports both AC charging and standard power management features.
• Ship-ready with clear label and orientation marking for correct insertion.

Who this is for: The GHU 33+ 48Wh replacement battery is aimed at owners of older Lenovo ThinkPad T400, R400, R61 and T61 laptops who need a reliable, OEM-compatible power pack to restore unplugged use. It’s ideal for professionals, students, and technicians maintaining legacy ThinkPad systems who want a safe, straightforward replacement with familiar fit, a clear capacity rating, and broad compatibility across legacy part numbers.