How to Open the Cover of a Maintenance-Free Battery?

[McStephanie]

There are no tricks; brute force is required. Here is some relevant information about the battery: 1. Cold Cranking Amps (CCA): The minimum current obtainable under specific conditions at -17.8°C and -28.9°C. This metric links the battery's starting capability with variables such as engine displacement, compression ratio, temperature, cranking time, the technical state of the engine and electrical system, and the minimum operating voltage for starting and ignition. Specifically, it refers to the minimum current a fully charged 12V battery can supply within 30 seconds while its terminal voltage drops to 72V. The CCA rating provides the total current value. 2. Reserve Capacity: The approximate time a vehicle can operate at night using the battery for ignition and providing minimal circuit load when the charging system is inactive. It is defined as the discharge time of a fully charged 12V battery at 25°C, discharging at a constant current of 25A until the terminal voltage drops to 10.5V.