Universal batteries refer to batteries suitable for various electronic devices, including not only military batteries but also civilian batteries. Therefore, the universal battery series not only includes military batteries, but also other types of batteries, such as alkaline batteries, nickel hydrogen batteries, lithium batteries, and so on. Here are some common types of universal battery series:

　　1. AA type batteries (LR6, R6, UM-3)

　　2. AAA type batteries (LR03, R03, UM-4)

　　3. C-type batteries (LR14, R14, UM-2)

　　4. D-type batteries (LR20, R20, UM-1)

　　5. 9V square battery (6F22)

　　6. Alkaline batteries (such as LR44, LR41, etc.)

　　7. Nickel hydrogen batteries (such as AA Ni MH, AAA Ni MH, etc.)

　　8. Lithium batteries (such as 18650, AA Li ion, etc.)

　　9. Lead acid batteries (such as 12V 7AH, etc.)

　　10. Lithium polymer batteries (such as Li polymer 3.7V, etc.)

　　The above only lists some common universal battery models, but there are actually more types of universal batteries. The specific type of battery to use depends on the device's requirements and personal preferences. When selecting batteries, you can choose the appropriate battery model and brand based on the device's needs and budget.

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