Posted by Jim Allen on November 19, 2009 at 10:25:30 from (209.173.160.22):
In Reply to: Optmia Battery posted by paul case on November 18, 2009 at 19:03:06:
John T said: (quoted from post at 18:20:55 11/19/09) FUN DISCUSSION
AS far as CCA versus reserve capacity seems to me if you need to start a diesel you need highhhhhhhh CCA so she cranks fast enough to raise the temperature of the compressed air sufficient for combustion when the injectors fire and you would be more interested in CCA then reserve to get that fast initial spin. TO THE CONTRARY if you have a gas engine or a worn out engine that takes a while to start and its not so necessary that she cranks really really fastttttt then reserve capacity means more..
To avoid comparing apples to oranges one would need perhaps the Amp Hrs and CCA and Reserve Capacity in order to arrive at the decision as to which battery is best for a particular application. To me that may be high CCA ORRRRR high reserve, depends on the engine. Noooowwwwwwww if one technology (lead acid, Gel cell, AGM, etc) is more efficient and stores more energy due to technology improvements, that may be the best provided theres sufficient real data to make the call???????
All true in a general sense but how often do you see two starting battery with major differences in CCAs and reserve capacity? Like one is super-duper in one area and truly lousy in the other, while another is vice versa. They're usually pretty balanced in capability in their class to be good for general use. Usually the differences are pretty small, perhaps with one battery, or type of battery, having an "edge" in one area or another. Sometimes you need that edge but the batteries I just looked at in the same general class didn't have enough of an edge from one to another be a "lifesaver" in either category, assuming a guy needed one over the other.
You can run sometimes into CCA trouble using a deep cycle as a starting battery or a starting battery in a deep cycle app, but those are not proper applications of the technology, so any problems are your own fault. The 12 year old batts in my pickup are deep cycles (yellowtops) but have only 100 CCS less (each) than the red top starting batts but are still 100 CCAs above the mfrs. CCA requirement for the truck.
Funny story. Back in '94, I had the batteries fail (on that same truck) while on a trip. I would have to jump start the truck from the trailer which had two six-volt deep-cycle golf cart batts in series for boondocking power. I went to a nearby Napa to get the batts replaced under warranty but even though they were only halfway through the period, the pro-rated cost was more than I paid for the new batts (how does that work, again?). In a fit of stubborness, I resolved to wait unit I got home to buy new batts (at a fair price and NOT from Napa). Jumping the truck from the trailer got annoying and, after a little creative cable-moving, I installed the two 6-volts in the truck and together, they were enough to start the truck during the rest of the trip (in the summertime).
This post was edited by Jim Allen at 10:30:39 11/19/09.
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