think i'll go yuasa, they seem to have come down in price to match the motobatt.
just for anyone else finding this thread, from yuasa website:
Cold Cranking Performance (Amps) – SAEThe Cold Cranking Performance (CCA) measures the starting performance of the battery. In simple terms, the higher the CCA, the easier it will be to start the vehicle.This is the starting test according to the SAE (Society of Automotive Engineers). The test specifies that the battery at a temperature of –18°C will deliver a current equal to the Cold Cranking Amps for 30 seconds with the voltage staying above 7.2 volts (3.6 volts for a 6 volt battery).Battery performance drops off quickly with temperature, so this test is a good check of a battery’s starting ability.Some other manufacturers use other CCA standards, for example, DIN, the German standard, JIS, the Japanese standard, ETN, the European standard etc. These will give different values to the SAE value.
Ampere-Hour Capacity at 20 Hour Rate (Ah)The Ampere-Hour Capacity measures the total amount of electricity stored in a battery.An Ampere-hour represents the amount of electricity when a current of 1 Ampere passes for 1 hour.The Ampere-Hour Capacity varies with the rate at which the battery is discharged; the slower the discharge, the greater the amount of electricity that the battery will deliver.The Ampere-Hour Capacity is the amount of electricity that a battery will deliver during 20 hours before the voltage falls to 10.50V. For example, a 60Ah battery will deliver a current of 3A for 20 hours.
