2001 Ford Focus Logo
Posted on Jul 14, 2009
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Battery replacement confusion!

I am replacing my original Ford Motorcraft battery, as it no longer holds its charge after a few days and is now 8 years old.
It is rated at 12V, 500A cold-cranking, 53 AH capacity. I am having trouble matching the capacity, so I may have to get a more powerful one, such as 590A 65AH, rather than a weaker one. However, is there a danger that the car's charging system may suffer from overload with a more powerful battery? The Ford manual says that the spec. should match that of the original, but a new Ford battery is more than double the price of other brands!!!
Also, the Ford manual stresses that the battery MUST!! be lead-CALCIUM, as is indicated on the Ford battery with ''Ca''. However, I do not see any mention of calcium on the range of well known brands of batteries available at retailers.
Any comments are welcome, as I am confused.

  • carlo210 Jul 15, 2009

    Definately says calcium, not cadmium, in the Ford manual, and there is a "Ca" (chemical symbol for calcium) marking on the Ford battery, as the manual says there will be. I have read a bit more on the internet and this is something to do with the technology inside modern lead-acid batteries. I'm just a bit wary when manuals stress the importance of something - after all, the current battery is 8 years old and still works (if used daily), so obviously it is a good system. As I may sell the car soon, I don't want to pay top dollar for a Ford battery! If I was keeping the car I would thouroughly recommend the Ford battery!

  • carlo210 Jul 18, 2009

    At last I have found a quality brand battery (Bosch/Varta) that meets the specification of Ford and my car. As expected, it is relatively expensive (still about 25% less than Ford's), but I suppose you get what you pay for. Thanks for all comments.

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Fahr Quad

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  • Posted on Jul 15, 2009
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I am confused too. Are you sure it didn't say lead-cadmium battery??? In any case you can buy any battery off the shelf that is a 40R series. The size of the housing and the location of the terminals should be the same as the battery you are replacing. Having a 590 CCA battery versus a 500 CCA one just means you have more power in reserve for cold weather starts. Check with your local auto parts supplier, Wal-Mart, or Batteries Plus for prices. Don't waste the money going for an 84 month battery. A 60 month will do just fine, and the only thing you are buying with the 84+ month battery is a SLIGHTLY better replacement policy.

  • Fahr Quad Jul 18, 2009

    Ford buys their batteries from an outside vendor just like everyone else, and they are no better or worse, just more expensive because of dealer mark-up. The electricity coming out of a lead-acid battery, lead- cadmium, nickel-metal hydride, or lithium battery is the same, so I can't see what difference it would make.

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cy schousboe

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  • Ford Master 2,002 Answers
  • Posted on Jul 15, 2009
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It won't hurt your alternator if you put in a bigger battery. Never go to a smaller one. Remember to measure the battery box , including height,to be sure the new battery will fit.,
I can't un derstand why the make up of the battery would make any difference to the charging system. Perhaps you should checkat the auto parts store for some input. If there was a specific reason for a lead-calcium battery as opposed to any other one they should know. They wouldn't want to pay out warranty claims for something if they don't have to.

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  • Expert 148 Answers
  • Posted on Jul 15, 2009
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The ford battery is more because there so much better than a battery from a parts store cheapy,putting a bigger battery in will not effect the charging system you will have more capacity,or more cranking amps,but the problem is the limited amount of room under the hood hope this helps out

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Buzzy
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