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What's more important: amp hours (AH) or CCA's?

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Replacing the battery on a 450cc electric start only bike (KTM 450 XCF). It does not have any lighting but I do have a handlebar mounted switch a radiator fan wired directly to the battery (fan draws .38 amps). 

 

In looking at some Li-Po replacement batteries I see one that has 6AH vs 4 AH and they both say they do 105CCAs. 

 

What's the diff between the 6 ah and 4 ah? 

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Amp/hours is the capacity the battery has for a continuous current flow.  Six Ah means it will produce a 6 amp current for an hour, or one amp for six hours.  4Ah is two thirds that capacity.

 

CCA is cold cranking amps.  That's the short term cold power surge available for high load things like driving the starter.

 

Always put LiPO's in a fire bag.  Always.

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This question is easy.  If you want to run lights you want amp hours.  If you want to start a big engine you want cranking amps.

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