In everyday lithium battery products, we often see various technical parameters like energy density 150 Wh/kg, battery capacity 1020 mAh, charging temperature 0°C ~ 55°C, and so on. Many people may understand what these parameters mean and how to calculate them, but there are industry standards for writing these symbols correctly. Incorrect usage can appear unprofessional. Today, let's go over the correct way to write commonly used lithium battery unit symbols.

Understanding Common Lithium Battery Unit Symbols

1. Kilowatt-hour (kWh)
   The term kWh represents the energy capacity of the battery. Here:

   • k stands for kilo (thousand) and should be lowercase, as per the standard abbreviation in the GB 3101-1993 measurement guidelines.

   • W stands for watt, named after the scientist James Watt, so it is capitalized.

   • h represents hour and remains lowercase to avoid confusion with H (henry), the unit of inductance.

   This structure maintains clarity and prevents misinterpretation. For example, K in uppercase would represent Kelvin, the unit of temperature, which differs entirely from k as thousand.

2. Megawatt-hour (MWh)
   Higher units, such as MWh (megawatt-hour), follow a similar logic but use an uppercase M for mega (million). Units above a thousand (like M for million and G for giga) are capitalized, while those below a thousand (such as m for milli) are lowercase.

3. Watt (W)
   The unit W for watt remains uppercase across applications, as it derives from the scientist's name, making capitalization standard by convention.

4. Milliampere-hour (mAh)

   • A in mAh (milliampere-hour) stands for ampere and is capitalized, as it is named after André-Marie Ampère.

   • m represents milli (one-thousandth) and should be lowercase.

     
     

Spacing Requirements with Symbols

According to industry standards, there should be a space between numeric values and their corresponding units. For instance:

• 3 W is correct, while 3W is incorrect.

• Temperature values should also include a space: 0°C ~ 55°C should be written as 0 °C ~ 55 °C.

  
  

Summary of Guidelines:

• Use lowercase for k (thousand) and h (hour).

• Use uppercase for A (ampere), W (watt), and larger prefixes like M (mega) or G (giga).

• Insert a space between numeric values and units (e.g., 3 W and 0 °C ~ 55 °C).

Following these standards ensures clear, professional presentation of technical information in the lithium battery industry.