I have 20 years old 1.6 liter car that has good 45Ah battery, and another car of the same age, that I rarely use, with 2.3 literengine that, according to the manual, needs 65Ah battery.
Will 45Ah battery get damaged if I use it to start the other car? Can big current draw damage it?
"Yvan@office" gurgled happily, sounding much like they were saying:
The relevant figure is the CCA - cold cranking amps. That's how much the battery can deliver in a burst. The Ah figure is how long it can deliver a sustained load - 1A for 45hrs or 65hrs.
In practice, if the CCA isn't as high as the starter motor requires, the starter will just churn slowly.
A big current draw causes the battery to heat up. If it's a very big current and sustained the battery may get damaged. But this is unlikely in normal use. I would expect both a 45ah and 65ah battery to heat to more or less the same extent, but provided there's no damage done the bigger battery will simply provide a current for longer.
Rob Graham
Nedavno Adrian napisa:
But the battery will not be damaged, right?
Not if you've got any mechanical sympathy at all. Basically if it'll start it (presuming they're the same voltage) it'll be fine.
Nedavno Duncan Wood napisa:
OK, thanks.
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