Battery bubbling on a tender after 36+ hours of charging

[Talon]

so i got a battery tender jr and i topped up my battery for my 1100 and it worked great, but i've just recently brought my "parts" bike down here and threw the tender on that bike's battery for a few days and it started bubbling after a while and said it was charging for the entire time (like 3 days) after the battery started bubbling on the 3rd day i disconnected it because i figured it wasn't working correctly.

so i'm asking if the bubbling is normal on a tender jr and how long would it take to charge a completely dead battery with a jr tender? or is my battery just hooped

i'm going through the process of evaluating whether or not its worth it to try to restore that bike and having a battery is crucial because i haven't heard/seen the engine fire while cranking over.

[SqDancerLynn1]

Overnight should be plenty of time. The battery may not be holding a charge ??

[Talon]

actually i just remembered i had a multimeter and i measured the battery and it says it has a voltage of 12.3ish which is regular voltage for a battery...
just wondering if because the battery was totally discharged if that would have made it take forever to charge up again?

also the battery bubbles a little bit whenever its moved/tilted, thats not really normal is it?

[psyguy]

sounds like a shot battery
bet it doesnt hold the charge well - as a quick test you can turn the headlight on and see what happens

[SPARKSS]

I'd suspect that this battery that keeps your tender on higher charge rate, has a shorted cell. A lead-acid battery (assumed) will show 2.1 to 2.3 volts per cell fully charged after sitting, and as high as 2.3 to 2.5 volts per cell just coming off of charge. Short 1 cell and you can see that the rest of the cells are continuously trying to be overcharged - which causes gassing (your bubbling) and a battery that won't have good performance.

Research load testing for this type of battery to understand this more. Research plate shedding and other causes of shorted cells in a lead-acid battery to understand how this occurs if you're interested.

[scotty]

Is your batter tender the type that auto shuts off??

I always rember trickle chargers still bubbling all winter causing us to monitor the water kevel

none of my battery minders have auto shut down. I leave them on one or two days then remove them.

[Talon]

yeah my tender went into maintain mode with my battery from my 1100 and worked fine, but i think the battery is probably just shot, i'll throw it in my bike when i get home tonight and see how fast it dies. I'll just grab a new one tonight after testing this one.
I was thinking batteries where like $90 instead of $40.

[scotty]

yeah my tender went into maintain mode with my battery from my 1100 and worked fine, but i think the battery is probably just shot, i'll throw it in my bike when i get home tonight and see how fast it dies. I'll just grab a new one tonight after testing this one.
I was thinking batteries where like $90 instead of $40.

the less expensive batteries do not have a [lace for the low water probe if your bike has one of those idiot lights.
I converted to gel and my red light is on all the time

[Talon]

yeah on my 1100 my red light is on all the time, i'm going to totally do away with it once i get to overhauling the dash on it, i just don't really see the point of having it in the first place anyway