Posted by John T on November 19, 2009 at 09:20:55 from (66.244.97.31):
In Reply to: Re: Optmia Battery posted by Jim Allen on November 19, 2009 at 07:18:42:
FUN DISCUSSION
As an engineer Im always aware of and looking for engineering "trade offs" and energy principles show us theres no free lunch i.e. if you gain something in one place it may result in losses elsewhere.
Remember when they used Amp Hrs as a comparative battery rating??? then now they talk more about CCA and reserve capacity etc etc. The bottom line is a battery is an electrochemical energy STORAGE device and some store more energy then others. In lead acid batteries thats more often more weight as that means more lead and more acid i.e. more weight
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???????
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