Note : 15.1V and 15.4V are compatible, they are in common use.

Buy with confidence! Our Website is your source for high quality Dynabook laptop batteries. This brand new 53Wh(4 cells) replacement Dynabook PORTEGE X40-K-12U Li-Polymer battery is made with high quality cells from Samsung. Each replacement battery for Dynabook PORTEGE X40-K-12U laptop has been tested on the Dynabook system before being dispatched and is 100% compatible with the original manufacturer's specification. When you buy our replacement Dynabook PORTEGE X40-K-12U battery, you're buying trust!

Safety and Excellence Features of Our Replacement Dynabook PORTEGE X40-K-12U batteries:
1. No memory effect, fast charge
2. Smart internal circuit board and Low power consumption IC design
3. Tested with strict quality control standards and meet or surpass OEM specifications
4. Certified by CE, UL, ROHS, ISO9001/9002
5. Cell-unbalanced-shut-off protection
6. Over-charge protection and Over-discharge protection
7. Over-heat protection
8. Over-current protection
9. Short-circuit protection
10.High capacity circulatory function (about 600-800 cycles)

Welcome your patronage and thank you for purchasing this high quality replacement Dynabook PORTEGE X40-K-12U laptop battery at Laptopbattery.com.sg! Before placing an order, please make sure that the part number of your old Dynabook PORTEGE X40-K-12U battery is listed as below and has the same shape as our replacement PORTEGE X40-K-12U battery's images (please view the larger images for details).

Product Larger Images

Compatible Dynabook Part Numbers

PS0104UA1BRS

Compatible Dynabook Laptop Models

Shipping Methods

Payment Methods

Warranty

1-Year Warranty
All our high quality replacement batteries for Dynabook PORTEGE X40-K-12U 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.

Returns

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.

FAQs

Q: How to check if this battery is compatible with my laptop?

A: First, find out the part number of your old battery or the model name of your laptop (e.g. 'Dynabook PORTEGE X40-K-12U') and match with our product compatibility table. Second, please compare the old battery with our product images to make sure their shapes are the same. Lastly, check the voltage (rating) is the same as the old one. For more details please click How to find one correct battery for my laptop?

Q: Do I need to charge the new Dynabook PORTEGE X40-K-12U battery for 12 hours for the first time use?

A: No. Lithium-ion batteries have no memory effect, so it’s the right way to charge and discharge normally.

Q: When connected to the power supply, do I need to remove my Dynabook PORTEGE X40-K-12U battery ?

A: It depends on your actual situation. Generally speaking, it will not cause any damage without removing your battery when you connect it to the power supply. Because the battery will not be charged anymore after it is fully charged, and then turn to the use of power supply system. But when the notebook high-speed operation causes the internal overheating, you’d better remove the battery, otherwise it is harmful.

Q: How to properly charge my Dynabook PORTEGE X40-K-12U battery?

A: Please avoid exhausting the battery power and then recharge, because it will bring a lot of damage to your battery. Therefore you have to charge it when remaining power nearly 10-20%. In addition, if your battery has not been used for a long time, please charge it once a month, and keep the remaining power about 40% and then store in a dry and cool environment.

Q: How to care for my Dynabook PORTEGE X40-K-12U laptop battery and extend its life?

A: 1. Tweak Your Built-In Power Saving Options.
2. Adjust the brightness of your laptop display as much as possible within an acceptable range.
3. Kill Power-Hungry Apps and Processes when they are unnecessary.
4. Use Hibernate, not just Sleep, Whenever Possible.
5. Regularly detach your Dynabook PORTEGE X40-K-12U battery and give it a careful wipe with a soft cloth to make sure the contact points are especially clean.
6. Avoid Full Discharges.