In general, winterising strictly refers to a special maintenance procedure conducted on an automobile engine to insure its reliability during the coming winter season. This procedure essentially checks the engine’s cooling system; in addition, the battery is load tested according to a specific protocol laid out by the Battery Council International (BCI). While ODYSSEY batteries do not specifically require this test to be conducted on them, the final decision whether or not to conduct this test is left to the user’s discretion.
The marine cranking ampere (MCA) rating refers to the number of amperes a battery can support for 30 seconds at a temperature of 32°F until the battery voltage drops to 1.20 volts per cell, or 7.20 volts for a 12V battery. Thus, a 12V battery that carries a MCA rating of 600 CCA tells us that the battery will provide 600 amperes for 30 seconds at 32°F before the voltage falls to 7.20V.
HCA is hot cranking amperes. It is the same thing as the MCA or the CA or the CCA, except that the temperature the test is conducted at is 25 deg C
Battery Council International (BCI) provides standardized definitions for physical dimensions of a wide variety of batteries. The sizes are grouped within a specific range and each range is given a uniquely identifiable number. This is indicated in by 35-PC1400 being a group 35, 25-PC1400 being a group 24 etc etc
The ampere-hour (Ah) rating defines the capacity of a battery. A typical battery that is rated as a 100Ah battery at the 10 hour rate of discharge is capable of delivering 10A for 10 hours before the terminal voltage drops to a standard value such as 1.67 volts per cell, or 10.02 volts for a 12V battery. Similarly, a 50Ah battery would supply a 5A load for 10 hours. The PC1200 battery is rated at 42Ah, so it can furnish 4.2A for 10 hours.