Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

IBM ThinkPad R60 Compatible Battery 10.8V 6600mAh 40Y6799

Up to 19% off
New arrival
From $81.99 USD $100.99
Shipping calculated at checkout.
Fits IBM ThinkPad R60, R61 and replaces OEM part 40Y6799, 92P1138, 92P1140, and 41 other Lenovo cross-reference numbers.
10.8V at 6600mAh delivers 71.28Wh—enough sustained output for full CPU and display load without voltage sag cutoff.
Connector slides straight into the R60 slot with dual contact points; locking tab seats flush when fully inserted.
We ran full discharge-to-hibernate and recharge cycles; BMS calibrated correctly on second cycle, no protection faults.
After installation, discharge fully to system shutdown, then charge uninterrupted to 100%—this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.8V

Amp

6600mAh

IBM ThinkPad R60 / R61 — 10.8V Li-ion Replacement Battery (40Y6799)

This is a 10.8V, 6600mAh (71.28Wh) Li-ion battery for the IBM ThinkPad R60 and R61 series laptops. It cross-references over 30 OEM part numbers, including 92P1137, 92P1139, and 42T4504. Fits ThinkPad R60 9455, R60 9456, and all R61 variants that originally shipped with the 6-cell or 9-cell 10.8V pack.

  • R60 and R61 battery platform: Both the R60 and R61 share the same 10.8V battery rail, connector pinout, and BMS communication protocol. IBM carried the same battery architecture across both generations, so one replacement covers the full lineup without firmware or connector changes.
  • Bench tested on actual hardware: We seated this cell in a ThinkPad R60 and cycled it through charge and discharge under mixed CPU and display load. The BMS communicated correctly with the EC, charge current tapered as expected at end-of-charge, and no fault codes were thrown during the session.
  • ThinkPad EC learn cycle after install: After fitting this battery, run it down until the laptop hibernates on low voltage, then charge it uninterrupted to 100%. This one full discharge-to-hibernate cycle resets the embedded controller's battery learn table and clears the inaccurate health warning that appears in Lenovo/IBM Power Manager after every cell swap.

Why the ThinkPad R60 reports poor battery health immediately after a new cell is installed

The ThinkPad EC reads health data stored in the battery's EEPROM — capacity, cycle count, and design Wh. A new replacement cell carries factory EEPROM values that do not match the EC's learned profile for the old pack, so the EC flags the mismatch as degraded health. This is not a fault with the replacement battery. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge. After that calibration pass, the EC rewrites its learn table against the new cell's actual data and the health warning clears.

ThinkPad R60 shutting down abruptly at 15–25% charge shown

This happens when the cell's actual voltage under load drops faster than the fuel gauge IC predicts. The IC was calibrated against the old pack's discharge curve, not the new cell's. Under full CPU plus display load, the voltage cliff arrives earlier than the percentage readout suggests, and the EC triggers a hard shutdown before the OS can hibernate. Run two to three full discharge-to-hibernate-then-100% charge cycles. After each pass the fuel gauge IC recalibrates its curve against the new cell, and the remaining percentage readout becomes accurate — target a stable reading down to at least 10% before treating the gauge as trustworthy.

Compatible Models

ThinkPad R60 ThinkPad R61 ThinkPad R60 9455 ThinkPad R60 9456 ThinkPad R60 9457 ThinkPad R60 9458 ThinkPad R60 9459 ThinkPad R60 9460 ThinkPad R60 9461 ThinkPad R60 9462 ThinkPad R60 9463 ThinkPad R60 9464 ThinkPad R60e 0656 ThinkPad R60e 0657 ThinkPad R60e 0658 ThinkPad R60e 0659 ThinkPad R60e ThinkPad T60 1951 ThinkPad T60 1952 ThinkPad T60 1953 ThinkPad T60 1954 ThinkPad T60 1955 ThinkPad T60 1956 ThinkPad T60 2007 ThinkPad T60 2008 ThinkPad T60 2009 ThinkPad T60 2613 ThinkPad T60 2623 ThinkPad T60 2637 ThinkPad T60 6369 ThinkPad T60 6371 ThinkPad T60 6372 ThinkPad T60 8741 ThinkPad T60 8743 ThinkPad T60 8744 ThinkPad T60 ThinkPad T60p 1951 ThinkPad T60p 1952 ThinkPad T60p 1953 ThinkPad T60p 1954 ThinkPad T60p 1955 ThinkPad T60p 1956 ThinkPad T60p 2007 ThinkPad T60p 2008 ThinkPad T60p 2009 ThinkPad T60p 2613 ThinkPad T60p 2623 ThinkPad T60p 2637 ThinkPad T60p ThinkPad T61 ThinkPad T61p

Replaces Part Numbers

40Y6799 ASM 92P1138 ASM 92P1140 FRU 92P1137 FRU 92P1139 FRU 92P1141 42T5227 42T5228 41U3196 40Y6797 40Y6798 41N5666 42T4504 42T4511 42T4513 42T4544 42T4560 42T4561 42T4566 42T4572 42T5233 42T5234 42T5245 42T5246 43R9252 92P1131 92P1132 92P1133 92P1134 92P1137 92P1138 92P1139 92P1140 92P1141 92P1142

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Net Weight461.4g /16.28 oz
Gross Weight611.4g /21.57 oz
Approximate Weight611.4g /21.57 oz
Dimension 226.60 x 80.26 x 22.40mm

Product Highlights

  • Brand: IBM
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The ThinkPad Power Manager shows this new battery as "poor" health straight out of the box — is the cell actually faulty?

It is not faulty. The ThinkPad EC compares incoming EEPROM data from the new cell against the profile it learned from the old pack, and any mismatch registers as poor health. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. After that single learn cycle, the EC overwrites its stored profile and the health warning clears.

The Wh rating showing in Windows or ThinkPad Power Manager is lower than the 71.28Wh listed on the replacement — why the gap?

The figure Windows reads comes from the EEPROM embedded in the battery, which stores the rated design capacity at the cell level. Actual measured capacity at 10.8V under bench load can read a few Wh below the rated figure until the fuel gauge IC has run two or three calibration cycles against the new chemistry. After three full discharge-to-100% cycles, the reported Wh figure stabilises closer to the rated value.

Charge stops climbing and holds at 80% — the laptop has been on the charger for hours and nothing moves

This is almost always a BIOS-level charge threshold, not a battery fault. IBM and Lenovo shipped a battery conservation mode in the Power Manager firmware that caps charge at 80% to reduce cell wear during long plugged-in sessions. Open Lenovo Power Manager or ThinkPad Battery Gauge, navigate to Battery Maintenance, and check whether a charge threshold is set. Disable the threshold or set the upper limit to 100%, then unplug and replug the adapter — charging will resume immediately.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

IBM ThinkPad R60 Replacement Battery, 10.8V, 6600mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections