When choosing a lithium battery and capacity for an electric bicycle, the following aspects need to be carefully considered:

Lithium battery type:

Ternary lithium battery: high energy density, light weight, but relatively low safety.

Lithium iron phosphate batteries: have good safety, long cycle life, but slightly lower energy density.

Capacity selection:

For daily short distance commuting (such as within 5 kilometers) and low cycling frequency, you can choose a smaller capacity battery, such as around 12Ah.

For medium distance travel (5-15 kilometers), it is recommended to choose an 18-20Ah battery.

A battery with a capacity of 24Ah or more would be more suitable for long-distance commuting (over 15 kilometers) or frequent use.

The following factors also need to be considered:

Budget: Lithium batteries with larger capacity and better performance are usually priced higher.

Vehicle compatibility: Ensure that the selected lithium battery matches the battery compartment size, electrical parameters, etc. of the electric bicycle.