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A battery question

Old 11-24-2017, 05:38 AM
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Default A battery question

Should I replace the battery?

Last edited by Garett; 01-22-2018 at 10:30 PM.
Old 11-24-2017, 05:58 AM
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Replace battery.
You are not draining the battery through a 'real' load that quickly.
Old 11-24-2017, 06:08 AM
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X2 battery is shot. Anything under 13 volts.
Old 11-24-2017, 06:22 AM
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Battery could be getting sulfated

this link is an ad, but briefly explains it: https://no.co/blog/diagnose-and-treat-battery-sulfation

General battery values:

State of Charge Voltage
100% 12.7 - 13.2
75% 12.4
50% 12.2
25% 12.0
Discharged 0 - 11.9

To cure the sulfation issue, you charge it at about 16 volts versus 14.4. Some refer to this as equalization. You have to monitor the battery when doing this or you could over-charge it and ruin it.

If you don't have a charger capable of putting out the 16v and monitoring it, it's probably cheaper to buy a new battery versus a new charger.
Old 11-24-2017, 02:13 PM
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Is your battery a flooded lead acid? Presume if so you have checked the fluid level. And again, if so have you tried equalization? Are you using a multistage charger?

Maybe simpler to just purchase another battery
Old 11-24-2017, 05:13 PM
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how long was the charger on for? if it was only on for mins it's obviously going to drop back to mid 12.5 if it started at 12.3. it'll take 5-10 hours to fully charge back up. leave charger on over night. take charger off. measure battery voltage 12 hours later. it should hold around 12.7 do it with the battery disconnected so nothing is draining it. its going to drop from 14.5 to 12.7 shorly after the charger is off. and then it should hold that. if it's in the low 12's 24 hours later the battery is dead. (or something is draining it, which is why you need to do this disconnected)
Old 11-25-2017, 12:30 PM
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Hope this helps.
Batts sit idle at 12.2-12.3. Your alt will “charge” it at 14.4 if no load. 13.4-13.8 is typical with a load.
You say it’s a quad so it only charges the batt to maintain they can’t really bring a battery from dead since even though they put out the voltage the amperage is very little. To the tune of 10/12
Old 11-25-2017, 06:42 PM
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Originally Posted by Dockholiday74 View Post
Batts sit idle at 12.2-12.3.
This is 100% wrong.

Most lead acid chemistries have a rested no load voltage ABOVE 12.7v.

OP's battery with a rested no load voltage of 1.3 ish, means it has been left far to long at partial state of charge, as evidenced that it will not crank his quad motor.... If it was a healthy battery, 12.3 volts would be maybe 60% discharged, but would still crank the motor.

OP needs 2 things.....

#1, a new battery.

#2, a way to prevent the new battery becoming discharged between uses and to ensure it gets a 100% charge each use - this might mean overhauling the charging circuit on the quad, it might mean a new battery charger, or it might mean a solar panel and regulator - but whatever he is doing now/has been doing clearly does not work and will kill a new battery.
Old 11-25-2017, 08:09 PM
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Originally Posted by mickt243 View Post
This is 100% wrong.

Most lead acid chemistries have a rested no load voltage ABOVE 12.7v.

OP's battery with a rested no load voltage of 1.3 ish, means it has been left far to long at partial state of charge, as evidenced that it will not crank his quad motor.... If it was a healthy battery, 12.3 volts would be maybe 60% discharged, but would still crank the motor.

OP needs 2 things.....

#1, a new battery.

#2, a way to prevent the new battery becoming discharged between uses and to ensure it gets a 100% charge each use - this might mean overhauling the charging circuit on the quad, it might mean a new battery charger, or it might mean a solar panel and regulator - but whatever he is doing now/has been doing clearly does not work and will kill a new battery.
In a perfect world with a batt that can be charged to 100% and then have nothing pull at it 12.7 is perfect. But without the ability to keep that charge and in the marine world with 12v constant on for bildge etc it’s very difficult to see that.
12.3 should start his quad. Obviously the batt is bad and we see it a lot with all the new equipment on razrs etc. stereos lights etc on very small batts with no real ability to charge them.
Old 11-26-2017, 03:48 AM
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You don't need "a perfect world" to see resting battery voltages, you can see them right now, in this world, quite regularly, on batteries that have been looked after.

Your last 7 words get right to the heart of the matter - all the equipment that uses lead acid batteries (often, as you rightly point out, too small) "with no real ability to charge them"...... I have helped fault find countless vehicles, rural equipment and boats, so so many have substandard charging systems. If a lead acid battery is not recharged to 100% straight after use, you can count it's useful life in days, otoh, charge it at the right rate with the right voltage, a starter battery should last 3-5 years and a good deep cycle 10-20 years.
Old 11-26-2017, 05:50 PM
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Easiest option would be to stick it on the charger overnight after use (on the proviso that it's a decent charger that charges at the right voltages and currents and either switches to float or shuts down when the battery is full. - a charger that just keeps charging will kill a battery as fast as not charging it at all)

What charger is it that you have?


Of course, 4 years isn't too bad out of a starting battery on a quad bike - could be just that it has had its day.

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