The parameters of energy storage batteries mainly include the following aspects:
1. Capacity: Capacity refers to the amount of electricity that a battery can store, usually expressed in ampere hours (Ah). For example, 48V100Ah represents a battery capacity of 4.8 kWh. Electricity (Wh)=power (W) x hours (h)=voltage (V) x ampere hours (Ah).
2. Charging and discharging efficiency: Charging and discharging efficiency refers to the energy conversion efficiency during the charging and discharging process. Charge discharge ratio=charge discharge current/rated capacity.
3. Cycle life: Cycle life refers to the number of times a battery can charge and discharge in cycles.
4. Depth of Discharge (DOD): Refers to the percentage of battery capacity released during use compared to the rated capacity of the battery.
5. Battery Health Status (SOH): The battery health status includes capacity, power, internal resistance, etc. It is the ratio of the capacity released by the battery from a full charge state at a certain rate of discharge to the cut-off voltage to its corresponding nominal capacity.
6. Self discharge rate: A low self discharge rate indicates that the battery has less power loss and better performance during long-term storage.
7. Internal resistance: The smaller the internal resistance of a battery, the higher its output power and charging and discharging efficiency.
8. Working temperature range: The working temperature range refers to the temperature range within which the battery can operate normally.
In addition, there are some important parameters such as uniformity, maximum charging rate, maximum discharge rate, maximum discharge current, etc.

To determine the performance of a battery based on the above parameters, the following methods can be referred to:

1. View capacity: View Ah value, The larger the Ah value, the larger the battery capacity, the more energy the battery can store, and the better the performance.
2. Observing charging and discharging efficiency: The higher the discharge rate of a battery, the better its charging and discharging performance, but this also depends on the specific application scenario.
3. Battery cycle life: The more cycles a battery has, the longer its cycle life. Long cycle life represents strong durability and can be used for a longer period of time.
4. Check the discharge depth and battery health status: If the discharge depth is too high, it may shorten the battery life, while the better the battery health status, the more stable the battery performance.
5. Measure self discharge rate: A low self discharge rate indicates that the battery has less power loss and better performance during long-term storage. In theory, the self discharge rate should be less than 2% per month, exceeding this value may indicate issues with the battery process or materials.
6. Testing battery uniformity: By conducting charge and discharge tests on multiple battery cells in series, the voltage rise and fall differences of each cell can be observed to determine the uniformity of the battery pack.
7. Testing internal resistance and maximum discharge current: A multimeter can be used to test the internal resistance and maximum discharge current of the battery. High quality energy storage batteries have smaller internal resistance and larger maximum discharge current.
8. Check the working temperature range: The battery operates stably over a wide temperature range, indicating strong applicability.
9. Observing live working: After the energy storage battery is powered on and continuously discharged for a period of time during live working, observe whether the two poles of the battery are hot. If they are not hot, it indicates that the battery protection board system is complete.
The above are just some basic judgment methods. In actual judgment of the quality of energy storage batteries, more factors need to be considered, such as battery cycle life, safety, cost, etc. Generally speaking, high-quality energy storage batteries should have characteristics such as high capacity, high charging and discharging efficiency, long cycle life, low self discharge rate, suitable operating temperature range, and small internal resistance. When purchasing or using energy storage batteries, by measuring and evaluating these parameters, the performance and quality of the battery can be evaluated, providing a reference basis for selection and application.