Battery Tender junior is boiling my battery? Normal?

I own a Battery Tender Junior. When I put it on my Suzuki GS500E it
starts boiling the battery almost immediately. Is it supposed to do
this? I checked the voltage while it was on there and it was about
14.25.

Thanks,
-Ryan

 

Voltage is high (13.6 - 13.8 is more normal) but not so high that it should be
boiling your battery.

 

How many amps to go with those volts?


--

Later,

Charlie

fix the e-mail address and it will get to me

 

According to http://batterytender.com/ [1] it should put out up to
0.75A, at up to 14.4V. How vigorous is the 'boiling' you speak of?
If it is just generating some bubbles, that is normal. If it is
very violently boiling the battery something is wrong with either
the battery or the charger. Unless the bubbling is very violent,
I would leave it on for a while and see what happens to the voltage.

--
Mark '01 SV650S '81 CM400T '99 EX250-F13 DoD #959635 RFB #2

[1]
Battery Tender Junior - 12V @ 0.75A $42.55
Battery Tender Junior's lightweight, compact size makes it ideal for
those hard-to-fit spots. The trickled charger with a brain will assure
batteries are maintained after charging and allows ready to go!

Fully automatic two-stage lead-acid battery charger. Perfect for all
lead-acid, sealed maintenance free and gel cell batteries.

After reaching peak 14.4 VDC, charger automatically switches to 13.2
VDC float voltage.

When voltage drops below 12.6 VDC, charger resumes charging back to
14.4 VDC.

Solid state two color LED indicates stage of charger.

Spark proof.

Reverse polarity protected.

12' output cord.

5 year warranty

 

Hygrometer would help detect a bad cell. If one of the cells is
shorted, instead of a 12 volt battery, one now has a 10 volt one
or something in between. Charging voltage would be too high for
that situation. But then this is getting too technical for this
forum. - HPT

 

How many amps to go with those volts?

I didn't check, but the charger is rated for 750 ma, as someone
stated.

I checked the battery again 36 hours later and it was not boiling, and
the battery tender indicatior had switched from red to green.

It was not violently boiling, but boiling more than just a few bubles.
I could hear it pretty easily. I will see what happens next time I
put it on, and I do have a hydrometer I can test it with. Thanks for
the suggestions.

-Ryan

 

Most likely it was nearly flat when you started charging. You might
want to check the voltage a few times to make sure it'll hold a
charge, but if it'll hold a reasonable voltage, there's no real
need for a hydrometer. If it won't hold its voltage, buy a new
battery and don't worry too much about which particular cell is bad.