1. Adaptive voltage: It is necessary to choose the appropriate transformer voltage based on the charger's own voltage level. Generally speaking, the input voltage of the charger transformer should match. For DC chargers, the input voltage is directly the voltage of the battery, so the transformer voltage should be selected based on the readiness of the battery. For example, for three batteries connected in series, a DC charger with a voltage of around 36V should be selected, and an input voltage transformer with a voltage of around 36V should also be used.

　　2. Output current: The larger the output current of the transformer, the faster the charging rate of the charger, and users will also experience less heating during normal use. If the output power of the transformer is insufficient, the charger may experience severe heating, unstable voltage, and low charging efficiency. Therefore, it is recommended that users choose products with stable output current that can meet the needs of battery charging.

　　3. Rated power: The rated power of the transformer should meet the power requirements of the charger. If the power is not matched when choosing a transformer, it will cause the charger to not charge smoothly, overload and heating problems. Therefore, we need to ensure that we select a transformer with sufficient power and stability.

　　4. Voltage stabilization performance: The voltage stabilization performance of transformers has a significant impact on the charging effect, directly determining the stability of the charging current of the charger during charging. Therefore, when choosing a charger transformer, we need to check its output voltage and current to ensure that they are both stable.

　　In summary, the transformer of a battery charger is one of its core components. When selecting, attention should be paid to various indicators, including adaptive voltage, output current, rated power, voltage regulation performance, and protection, etc. Choosing and using high-quality transformers correctly can not only improve the efficiency and practicality of battery chargers, but also ensure their reliability during use.

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