How do you tell if you have a bad battery How do you tell if you have a bad battery
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    How do you tell if you have a bad battery
from flukem (205.204.242.21)  
3/5/2007 10:34:00 AM

Rated:

 I have noticed that my batteries are getting weaker. Could it be just one battery in my 24v system and how do you check. They are everstart and are not two year old yet
Thanks
Flukem


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   battery check from Irbf (72.24.87.10)  3/5/2007 10:40:00 AM
 Easiest thing is to pull the batteries and take them to Wal-Mart and have them load tested.


   That'sa an easy one. from Jus' Bassin' Thru (69.237.162.13)  3/5/2007 10:50:00 AM
 When it's tounement day, it 2:50 PM, weigh-in is at 3 PM, your two miles from the ramp and your battery won't start. THEN you know your battery need replacement. LOL

That's exactly how I checked my starting battery just over a month ago. It's a good thing that guys in the club noticed I hadn't weighed in and my truck and trailer were still parked at the ramp and came looking for me at 4 PM. Thanks guys. It's always good to know some will come looking when thing aren't right. I'm lucky I was ONLY 2 miles from the ramp.

Never push your batteries too far. It's alway best to get new ones rather than have a GOOD story about how long your current batteries have lasted. Otherwise you may have a story like mine.


   Load test from Jefferymac (199.250.3.66)  3/5/2007 10:51:00 AM
 If you are close to a Auto Zone., They will load test them in your boat. Which ever is easier...


   bad battery from Diehard (68.101.46.242)  3/5/2007 11:10:00 AM
 When yo electrical chit don't work.....or it won't take a charge. you has a bad battery


   stick your tongue to it from bill (70.159.81.221)  3/5/2007 11:51:00 AM
 and see if you get a little tingle.


   Volt meter from Spookchucker (68.223.53.128)  3/5/2007 12:00:00 PM
 Take the caps off and put a volt meter across each adjacent pairs of cells. Bad cells usually read 1.7 to 1.9 volts. Good ones around 2.1 to 2.2 volts. Any reading 1.9 & lower is a bad cell.

2 years is good for an everstart battery. Most people I know that have tried them, including myself, never get more than 1.5 years. Replace with Trojans. }:-)


   Load test is best way to test batteries, Forget the voltage reading. from humminbird (71.48.27.229)  3/5/2007 7:38:00 PM
 It is so simple. Any auto store can test them, free of charge.

Humminbird


   i think from asu72 (74.194.32.221)  3/5/2007 9:22:00 PM
 bill has the right idea but I find that you have to touch your yongue to both posts at the same time for it to work. Last time I tested mine my girlfriend went out and bought me a new set of batteries.


   load test from MikeF  3/6/2007 8:03:00 AM
 The only way to test your battery is with a load tester. A voltmeter will tell you if it has a bad cell but it will not tell you if it has reduced capacity. But if you think your battery is bad it probably is.


   Bad cell = reduced capacity from Spookchucker (141.151.33.213)  3/6/2007 2:09:00 PM
 Not only do you lose the bad cell of capacity(approx 17%), but you lose efficiency as voltage drop is a constant, not a percentage. The bad cell also adds internal resistance so the other good cells can't output to their capacity. It's the quickest and easiest way to determine a bad battery, and you don't even have to buy the gas to take your battery to the parts store.


   reduced capacity from MikeF  3/6/2007 3:57:00 PM
 Not wanting to start an argument but a lead acid cell can read fully charged and still not have full capacity. So again a voltmeter will tell you if a cell is bad but it can not tell you anything about the reserve capacity or the amperage. If it could there would be no need for load testers.


   P=ie from Spookchucker (74.224.90.99)  3/6/2007 10:07:00 PM
 P(Power) = I(current) x E(Voltage)

If voltage is low, then power, and thus capacity is low. The load test most places typically run show the same thing a voltmeter will show, and that is P(power) is low. Load test do it via current"I", and a volt meter via voltage "E". It's just using a different method to measure the same thing. The nature of a lead/sulfuric acid battery is such that the same thing that shows up as low load carrying capacity will also show up as low voltage on a cell. }:-)


   formulas or knowledge from MikeF  3/7/2007 8:26:00 AM
 You can quote all of the ohms laws you want and it will not change the facts. If you were correct then bigger batteries wouldn't have more capacity. You are not entirely wrong but you are not entirely correct. Voltage is only one factor. Do your homework.


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