My battery was replaced last time over 6 years ago and cranking started
to take longer now, so I want to replace it ASAP. The current battery is
an Interstate MT-24F model which, according to the Interstate website,
provides 600 Cold Cranking Amps (CCA.) I also looked into my Owners
Manual and there the battery spec says: 55 AH / 5 HR. Nothing about CCA.
So I wonder how I could reconcile such different specs and get the right
battery capacity matching the alternator's charging capacity. Is Honda
just trying to force us to buy even such staple items, like batteries
from them, even though Honda itself probably also buys them from
companies, such as Interstate and puts its own label on them?
Which replacement battery brand you guys favor for your cars? Mine is a
'94 Accord LX.
There is more to that than just matching voltage. Larger capacity
batteries may need more Amps to charge than lower ones. That's why
alternators are matched with the batteries. Not on voltage, which is 12
V these days in all gasoline powered cars anyway.
In any case, I had the battery swapped today with the same brand and
model as I could not risk driving with the old one anymore. I was
surprised how much its price increased over the last 6 years: almost
doubled. And this was supposed to be a low inflation period, according
to government inflation index.
I'm no expert, but I'd guess that's just to make sure the larger
battery could be fully charged, to support larger loads, in a given
amount of time. It's not really a property that large batteries need
more amps or they won't charge fully or at all, not afaik.
The charging current is self-limiting by design/function of the alternator.
In reality alternators are rarely required to charge from zero. If/when
they are a full charge simply takes longer. Perhaps I should mention that
despite the full current rating most auto alternators are not
designed/intended to deliver full rated current at a 100% load.
More import is to have the alternator rated for the load the vehicle
electrical system requirements plus a bit left over to top off the battery.
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