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Old     (lstewie)      Join Date: Mar 2009       05-17-2010, 6:16 PM Reply   
I have 2 deep cycle batteries that when charging on a promariner prosport 12 charger, they gurgle. Is this normal?

-I have checked the level of the fluid in the batteries and they are topped off.
-Batteries are 1 years old
-Batteries are Duralast marine deep cycles
Old     (wake_upppp)      Join Date: Nov 2003       05-17-2010, 9:40 PM Reply   
What is the amperage they are being charged at? It may be too high. Fast charging will cause the battery acid to bubble slightly. Could this be what you're hearing?
Old     (lstewie)      Join Date: Mar 2009       05-18-2010, 1:57 PM Reply   
Hard to say exactly what voltage the charger was putting out, however the caps for the stereo were showing 12.1 volts at the time. I have seen the caps show voltage as high as 14.2 while charging...... I assume this is part of smart charging the promariner charger does.
Old     (jimmy_z)      Join Date: Jun 2009       05-18-2010, 2:16 PM Reply   
Yes it is normal for them to bubble.

When a lead acid battery is being charged hydrogen gas is produced.

That is why you should always be cautious when removing cables after charging. Make sure charger is off and adequate ventilation.

A small spark from a cable can ruin your day.

Last edited by jimmy_z; 05-18-2010 at 2:18 PM.
Old     (wake_upppp)      Join Date: Nov 2003       05-18-2010, 5:32 PM Reply   
Voltage is not the issue, amperage is the answer you're looking for. A trickle charger is usualy 1 or 2 amps but a regular charger can range from 2 to 60 amps. High enough amps to bubble the battery acid will shorten the life of the batteries over time. Batteries prefer a slow charge for longer life. Basicaly you're cooking the life out of them.
Old     (jimmy_z)      Join Date: Jun 2009       05-18-2010, 5:45 PM Reply   
Austin you have a smart charger. No need to worry.(unless its defective) What you are hearing is normal.

A smart charger provides optimum charge cycles. The first step is bulk charging where up to 80% of the battery energy capacity is replaced by the charger at the maximum voltage and current amp rating of the charger. When the battery voltage reaches 14.4 volts this begins the absorption charge step. This is where the voltage is held at a constant 14.4 volts and the current (amps) declines until the battery is 98% charged. Next comes the Float Step. This is a regulated voltage of not more than 13.4 volts and usually less than 1 amp of current. This in time will bring the battery to 100% charged or close to it. The float charge will not boil or heat batteries but will maintain the batteries at 100% readiness and prevent cycling during long term inactivity.

Even during the float charge your battery will still produce hydrogen gas. It will still will "bubble". Just not as much and you may not hear it.


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