High-grade Battery for IBM Fru 42T5209 (4400mAh, 8 cells)

  • SKUBUS906
  • ConditionReplacement, Brand New
  • Voltage14.4V
  • Capacity4400mAh
  • Number of Cells8 cells
  • Cell TypeLi-ion
  • ColorBlack
  • Size272.30X106.37X20.0mm(L x W x H)
  • Warranty1 Year
  • AvailabilityIn Stock
Note : 14.4V and 14.8V are compatible, they are in common use.

Product Features

Excellent Quality,Thorough Service

The replacement battery for IBM Fru 42T5209 from BatteryBuy.us will be your best choice. We offer the high quality laptop battery at a more reasonable price. Our IBM Fru 42T5209 batteries can be charged/discharged for at least 600 cycles. Being made of ABS plastic case and the original IC protection chip, it could give you new experience of excellent durability.

With first-class quality assurance, the battery for IBM Fru 42T5209 provides protections of voltage, short circuit, charging time, ESD, and so on. Each IBM Fru 42T5209 laptop battery has passed a series of safety certifications, such as CE, UL, ROHS, ISO9001/9002. It will be rigorously tested by our technicians before being shipped to your hands. We will try our best to select a high quality IBM Fru 42T5209 battery for you.

In addition, we provide a 30-day money back guarantee and a one-year warranty for you. If you have any dissatisfaction after receiving the battery for IBM Fru 42T5209, you can click the link to find more details about our Returns and Warranty service. Please rest assured to purchase from us!

Multiple Intelligent Protection


Product Larger Images

Battery for IBM Fru 42T5209 laptopBattery for IBM Fru 42T5209 laptopBattery for IBM Fru 42T5209 laptopBattery for IBM Fru 42T5209 laptop

Compatible IBM Part Numbers

  • 40Y7904
  • 40Y8314
  • 40Y8318
  • 42T4639
  • 42T4660
  • 42T4661
  • ASM 42T5209
  • FRU 42T4507
  • FRU 42T5204
  • FRU 42T5206
  • FRU 42T5207
  • FRU 42T5208
  • FRU 42T5209
  • FRU 42T5250
  • FRU 42T5251
  • FRU 42T5259
  • FRU 42T5260
  • FRU 93P5031
  • FRU 93P5032

Compatible IBM Laptop Models

  • ThinkPad X60 Tablet PC 6363
  • ThinkPad X60 Tablet PC 6364
  • ThinkPad X60 Tablet PC 6365
  • ThinkPad X60 Tablet PC 6366
  • ThinkPad X60 Tablet PC 6367
  • ThinkPad X60 Tablet PC 6368
  • ThinkPad X60 Tablet PC
  • ThinkPad X61 Tablet PC 7762
  • ThinkPad X61 Tablet PC 7763
  • ThinkPad X61 Tablet PC 7764
  • ThinkPad X61 Tablet PC 7767
  • ThinkPad X61 Tablet PC 7768
  • ThinkPad X61 Tablet PC 7769
  • ThinkPad X61 Tablet PC

Shipping Methods

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Payment Methods

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1-Year Warranty
All our high quality replacement batteries for IBM Fru 42T5209 laptop come with a 1-year warranty. Warranty is applicable if the buyer has installed the battery properly in the device and has treated the battery correctly.

30-Day Money Back Guarantee
Our goal is to turn customer satisfaction into ‘Complete Customer Satisfaction’. That's why we offer you a 30-day money back guarantee, on top of our warranty and RMA procedure for defects!
Please note: in order to qualify to get your money back, you must first contact us and await instructions before sending back your product.


If you have a problem with one battery which bought from us, please contact us first. We will process your request and try to find a solution for your problem. If the problem cannot be fixed by our technical support engineer, we will generate an RMA number (Return Material Authorization) for you. If inspection concludes that the returned battery is defective, a new battery will be shipped out without extra charge.
Please note: we cannot process returned batteries if you have not yet received an RMA number.


Q: Is this IBM Fru 42T5209 battery compatible with my laptop?

A: Through product compatibility table, you can check if IBM Fru 42T5209 battery is compatible with your laptop. Clicking product larger Images, you can confirm the selected correctness of IBM Fru 42T5209 laptop battery. What’s more, please pay attention to check if the voltage (rated value) is the same as your old one. For more details please click How to find one correct battery for my laptop?

Q: How long will the IBM Fru 42T5209 battery last? When should I replace my battery?

A: All rechargeable batteries are being spoilt gradually from the date it starts running. Performance degradation will be found by users in 18-24 months. When the runtime is unable to meet your demand, we’d suggest you buy a new IBM Fru 42T5209 battery.

Q: How to charge my IBM Fru 42T5209 laptop battery correctly?

A: There is no need for you to charge the battery over 12 hours, just charge and discharge it normally instead. Because lithium-ion battery has no memory effect. Additionally, you should charge in time while the power remains only 10%-20%. If your battery won’t be used for a long time, please charge it once a month and keep battery power over 50%. Moreover, there is no harm even if you charge battery while using your laptop or supply external power in a fully-charged state. However, if your laptop has been running at high speed for a long time, which causes overheat insides, you'd better take the IBM Fru 42T5209 battery out of laptop.

Q: How to replace my IBM Fru 42T5209 laptop battery?

1 Turn off laptop and unplug the power cord.
2 Remove the battery release button, and then uninstall your old IBM Fru 42T5209 battery carefully.
3 Use a clean cloth to wipe off dust from the battery compartment. It’d be better if you could wipe the exposed conductive part, which connects battery and laptop, with alcohol to remove the copper rust before installing a new battery.
4 Keep your laptop and battery in a cool dry place (heat may destroy a battery).
5 Install new IBM Fru 42T5209 replacement battery into your laptop, and remember to close the battery latch.