battery charging...should I hear it?

[lwszabo]

I just hooked up my battery tender and the light is red, I have never noticed it before, but i can hear the battery charging if I listen close...is this normal?

[Slide Panda]

You hearing that battery or the charger?  The charger will emit a hum

[lwszabo]

like aboiling noise from the battery.

[Slide Panda]

Lead acid batteries emit small amount of hydrogen and oxygen as part of the charging process.  You probably hear it bubbling up from the plates - might sound a bit like a half flat soda.

[Howie]

Just to be sure, put a volt meter across the battery.  If your battery charger is a low rate charger and you are seeing more than 15 volts, either your battery is faulty or your charger is over charging.  If you are using a high rate charger, reduce the rate to 2 amps or less and less than 15 volts.  No volt meter?  Feel the battery.  It should be warm, but not hot.