REFLECTOR: Over Charging Help !!

[Scott Derrick]

14.2 volts is a good float voltage for an aircraft battery.  An 
equalizing charge of 15 should be limited to a few hours at a time if 
you need one.

Bubbling is a normal process in a battery and should be expected above 
13.2 volts. The higher the fiercer the bubbles.

Always add water to a fully charged battery, never to a low battery 
unless the plates are visible, and then just add enough to cover the 
plates so you can charge it to full.

A battery will tend to die earlier from undercharging vs. overcharging.  
Overcharging will require more frequent watering. Thats a generalization 
and there are exceptions.

Scott

John Dibble wrote:
> I think even 14.2 v, which is what my system is at, is not good for 
> the battery.  I'm barely going to get 2 years out of my Interstate 
> SLA.  A charger puts out 14 v and when my battery is fully charged, I 
> can hear it percolating with a charger on it.  Is there a way where 
> after 20 minutes after starting I can flip a switch and reduce the 
> voltage to the battery to 12.5 v and keep the rest of the system at 14.2?
>
> John
>
> Ron Brown wrote:
>
>> It sounds like the voltage regulator is not working correctly.  You 
>> shouldn't see more than about 14.2 - 14.6 volts when it is charging 
>> correctly.  Voltage this high (16-17 volts) will overcharge and 
>> damage your battery.  When the battery opens up, the voltage may go 
>> even higher and start wiping out your electronics and avionics - not 
>> good! Ronnie
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