Originally posted by Frank:
Although I think the Dynabatt is a great mod, they are a bit suspicious in their amperage ratings. The stocker is rated for 590 CCA at 0F (like all CCA ratings), while the Dynabatt is rated for 490 CCA at 32F.
Where did you see it was rated at 32F??? CCA is determined as follows:
For example, a 12 volt battery with 600 CCAs means the battery will provide 600 amps for 30 seconds at 0°F before the voltage falls to 7.20 volts (six cells). The higher the CCA, the more powerful the cranking ability.
For reference the starter draws around 60-70amps to run over. So even a Dyna-batt would start the car ~8 times without a recharge. There is no reason to doubt it's cranking power. It's design is far superior to a wet cell battery in efficiency. It's in "reserve time" that it is seriously diminished, but that is understandable considering the size difference. It has about 1/3 the reserve time. (that's roughly 30 mins) Reserve time is continuous use time at a 20 amp draw.
If you live in a cold climate, you should consider the CCA rating when choosing a battery. If you live in a hot climate, you don't need as much CCA.
days while the tranny was being done.