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Stupid battery question #11006502 07/29/15 01:56 AM
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tgravley aka lewisvillecatfish Offline OP
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If both interstate starter batteries on a boat show approx. the same voltage which is 12.4 to 12.6. Why would one start the boat strong but the other doesn't


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Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11006530 07/29/15 02:09 AM
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Bob Landry Offline
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One has a weak cell and you are reading a surface charge. Charge it for 24 hours, let rest for 24 hours then load test it.


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Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11006586 07/29/15 02:32 AM
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smooth move Offline
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check them under load.


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Re: Stupid battery question [Re: smooth move] #11007019 07/29/15 12:27 PM
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TCK73 Offline
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Originally Posted By: smooth move
check them under load.


This. If it falls below 10V under load, replace it. You can remove the surface charge by running the starter for 5-10 seconds.

Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11010695 07/30/15 11:33 PM
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tgravley aka lewisvillecatfish Offline OP
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Thanks


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Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11010759 07/31/15 12:12 AM
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Bob Landry Offline
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If you are going to load test it, it's better to actually let it rest for 24 hours after charging to allow the surface charge to dissipate. Running a load on the battery for a few seconds is probably not going to give you a reliable test.


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Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11012322 07/31/15 08:44 PM
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gary purdy Offline
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You have already load tested the battery`s and one failed.


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Re: Stupid battery question [Re: tgravley aka lewisvillecatfish] #11013299 08/01/15 12:17 PM
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Go buy a cheap digital volt meter. Affix the 2 leads to either side of the battery posts. Watch the voltage when you crank the motor(load test). If as said before your voltage drops below 10vdc, ya need a new battery!


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