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#11006502 - 07/28/15 08:56 PM Stupid battery question
tgravley aka lewisvillecatfish Online   content
TFF Guru

Registered: 02/06/09
Posts: 12921
Loc: highland village/lake Lewisvil...
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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#11006530 - 07/28/15 09:09 PM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2762
Loc: Austin, Tx
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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#11006586 - 07/28/15 09:32 PM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
smooth move Offline
Extreme Angler

Registered: 10/14/12
Posts: 1283
Loc: bayou vista,tx
check them under load.
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#11007019 - 07/29/15 07:27 AM Re: Stupid battery question [Re: smooth move]
TCK73 Online   content
TFF Team Angler

Registered: 03/26/15
Posts: 3592
Loc: Jack County
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.

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#11010695 - 07/30/15 06:33 PM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
tgravley aka lewisvillecatfish Online   content
TFF Guru

Registered: 02/06/09
Posts: 12921
Loc: highland village/lake Lewisvil...
Thanks
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I live with Fear everyday but sometimes she lets me go fishin
Lewisvillecatfish.com

PB 65#
www.lewisvillecatfish.com
Facebook.com/Tom Gravley
www.youtube.com/gravleybrats

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#11010759 - 07/30/15 07:12 PM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2762
Loc: Austin, Tx
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.
_________________________
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115

Bitter Gun Owner
Bitter Clinger
Armed Infidel

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#11012322 - 07/31/15 03:44 PM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11423
Loc: Littlefield Tx & Lake A. H. US...
You have already load tested the battery`s and one failed.
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#11013299 - 08/01/15 07:17 AM Re: Stupid battery question [Re: tgravley aka lewisvillecatfish]
texcajun Offline
TFF Team Angler

Registered: 01/31/03
Posts: 3699
Loc: The Woodlands Texas
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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