Brand : XIAOMI Battery
Type : Li-ion
Capacity : 5200mAh/40WH
Voltage : 7.7V
Encoding : XIA24SOT1801

R13B03W Alternate with the following models：

R13B03W

The product XIAOMI R13B03W is perfectly compatible with the product model XiaoMi RedmiBook 13 XMA1903-AF/AN/BB :

For Xiaomi RedmiBook 13 XMA1903-AF/AN/BB
Xiaomi RedmiBook 13 XMA1903-AF
Xiaomi RedmiBook 13 XMA1903-AN
Xiaomi RedmiBook 13 XMA1903-BB

ES : Batería de portátil XIAOMI R13B03W
FR : Bonne qualité batterie d'ordinateur portable XIAOMI R13B03W
JP : 高品質 XIAOMI R13B03W のノートパソコンのバッテリーを購入する
PL : Baterie do laptopa -- XIAOMI R13B03W
US : Replace XIAOMI R13B03W laptop battery

http://pc-laptop.co/xiaomi-battery-R13B03W-p191280.htm

What is the run time of XIAOMI R13B03W battery?

XIAOMI R13B03W have two main ratings on them: Volts and Amperes. Because size and weight of batteries is limited when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamperes. One thousand Milliamperes equals 1 Ampere. When buying a battery, select batteries with the most Milliamperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together.

There are several steps you can take to help you get maximum performance from your XIAOMI battery:

1. If you are not using the internet turn off your wifi connection and lower the intensity of your backlight (hold down function and move the arrows up or down to change intensity).
2. Let the power of the batteries (15%) drain to 0% When you use your brand new Battery first time. And then full charge it(usually chrage it full 12 hours) and let it drain to 0% again. Do this for 2~3 cycles.
3. Don't leave your computer plugged in constantly when it is not in use.
4. Keep your notebook in a well ventilated place and keep it cool. Your battery works faster when it is hot because it is creating more energy and is burning out faster.
5.Unplug any external devices that you don't need such as using a usb or bluetooth mouse .
6. If you are not using the device, do not put your laptop battery in the device for an extended period of time.