New 4212mAh B31N1909 Replacement Battery for Asus ExpertBook P2 P2451FA P2451FB P2451FB-1A

Shipment Methods

Currently, all of our shipments are through Priority Mail (EMS USPS),if you are dealer,you can selected others .We can not offer Overnight (UPS Red) and 2nd Day Delivery (UPS Blue) .

Shipping & Handling

Free Shipping on All Products
Your order will be dispatched within 48 hours.
Estimated Delivery Time:7-15 Business Days
It is very easy for you to check the status of your order and locate the package during transit, as an email with a tracking number will be sent to your email address after your order has been shipped out. Tracking number will be emailed to buyer once your ordered item is shipped out.
Shipping rates: Our rates include the expenses of shipping, handling and the high quality packaging.
Attention: Priority mail will be used for all PO Box shipping addresses ,But All APO's and military addresses do not apply here. Please use standard shipping for these. Thank you.

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How to find Lenovo Battery Part Numbers?

Essential to the purchase of your new laptop battery is the part number. A part number is a unique identifier that is assigned to a part to simplify referencing and to unambiguously define a part within a single manufacturer. Knowing about part number of the battery will more accessible to buy a correct battery, and it is comparatively accurate to search a battery by its part number than the model name of laptop.
A laptop battery has at least one part number (that is, the battery model we often say), and many batteries even have multiple part numbers. When you find a battery with the same part number as your laptop battery, you can be sure that it is fully compatible with your laptop.
How do I remove the battery from my Lenovo laptop?
If your laptop is plugged in, either unplug it or disconnect the power cable.
Turn your laptop over so the bottom is facing up.
Locate the battery latch on the bottom of the laptop. The image above shows some of the more common battery latches found on laptops.
To remove the battery, slide the latch switch to the opposite side and hold it in that position until the battery is released.
On some laptops, the battery pops out on its own. On others, you'll need to pull it out gently with the tips of your fingers.
Lenovo Battery Part Number Identification
Lenovo often lists several part numbers, one is called "FRU p/n", on is called "ASM p/n", and occasionally the model number is just listed on the battery with no preface. Also on many Lenovo cartridges there is a red or orange circle with a number inside it (also may contain a + sign).
Examples of Lenovo Battery part numbers:
01AV458
45N1001
57++
70+
L17C4PH1
0A36302
OA36302

How Do I Find The Model Of My Laptop?

Method 1: Locating The Model Number Of Your Laptop Using Product Label
This is the easiest and the most efficient way of locating the model number of your device. Follow the steps given below to get your model as well as product number:
1.In most of the laptops, the label containing the information is located on the lower side of the device. To locate it, first of all, unplug the laptop from any AC cable and shut it down.
2.Reverse your laptop and keep it in a safe place.
3.On the base of the laptop, you may see a label where an icon of your computer manufacturer is printed.
Please note: on some laptops, the label is inside the main battery compartment, and you must remove the battery to read the label. In addition, the manufacturer may print the model of the laptop (such as E5-572G-593Y for Acer Laptop) on or near the keyboard.
Figure 1: Label on or near the keyboard

Figure 2: Label on the back of the notebook

Figure 3: Label inside the battery compartment

Figure 4: Near power button (such as Latitude E6410 for Dell Laptop)

Figure 5: View the Power On Screen (such as Latitude D630 for Dell Laptop)

Method 2: Locating The Model Number Of Your Laptop Using System Information
This method works very well if your laptop is in working state. Most of the old computers’ sticker get rub out by time and becomes illegible. Hence, this method is considered best among all cases to locate your laptop model number. This technique works very fine with all the latest Windows 7/8.1/10 Operating Systems.
1.Head on to the home page of your laptop.
2.Click windows start button button and get on to 'Run' menu. You can also do this by using the shortcut key ⊞Win + R.
3.Type in "msinfo32" without quotes.

4.Click OK. This will open the Windows System Information utility, which contains details about your specific model of laptop (such as Latitude E6520 for Dell Laptop).

5.Find and write down the "System Model" number.
Method 3: Locating The Model Number Of Your Laptop Using Access Of BIOS
This method is the last option but the most successful one. If above methods did not work on your computer, you can rely on this.
BIOS stands for Basic Input/output system, you can access this system and find out the information about your computer using the steps given below:
1.Close all your applications and save in case you are doing some important work. Restart your computer.
2.As soon as your computer turn on, immediately press the F2 key or ESC key whichever your computer supports to go to the BIOS Menu.
3.If you failed to go to the boot menu, again restart your computer and follow the above steps again.
4.Once you get into the BIOS, you can see the full information such as model number, the product number of your computer.