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It came from the factory with a ( 650 ) cold cranking amp battery , according to the Owner Guide
Yes
If you live in a cold climate the more the better.
There is no better, but 800 is more cranking power that 650.
910 cranking amps 700 cold cranking amps
cranking amps or cold cranking amps Group refers to its physical dimensions.
910 cranking amps 700 cold cranking amps
look for information sticker on battery where the c.c.a. {cold cranking amps} will be listed.
I believe it came from the factory with a BCI group size 40R battery that was rated at 590 cold cranking amps ( CCA )
"Cranking Amps" are the amount of amps required for the starter to crank the engine. Automobile batteries are measured in "cold cranking amps." That's the amperage capacity of the battery in cold weather.
Nothing at all. Increasing the cranking amps will not harm anything. The starter will only draw the amps it needs.
The BXL-65 has 675 cranking amps at 0 degrees and 840 cranking amps above 32 degrees.