Battery Cap Popped Off!

[juniselect]

Hey all!
I just wanted to run this by you to see if there's any input you may have!
Today, I started up my N600 (after about 4 months of non-use) and moved it out of the garage so I could do some work on my CR-V.  Then later tonight, as I was moving it back into the garage, just as I turned it over, I heard a loud pop come from the engine bay.  As I popped the hood and feared for the worse, I saw that the battery had popped off one of the two caps and even cracked a bit (DieHard about 4 years old).  Anyway, I pushed my N600 back into the garage and as I look to replacing the battery, is there anything else to be on the lookout for?
Thanks!
Marty
San Francisco, CA

[Dr. Whiting]

Battery internally shorted and the arcing lit off the hydrogen inside.

[PETER WATKINS]

Marty
If the battery had a cell that was gassing heavily due to being sulphated/faulty, the sudden release of gas could blow out a cap. The increased current flowing when the starter is used could do that.
I have seen another thing happen which is the release of Hydrogen from a cell being ignited by a spark, usually that is a very big bang !
Fit a new battery and check the charging voltage just to be sure.
Peter

> ========================================
> Message Received: Apr 16 2015, 06:57 AM
> From: "juniselect@... [2cylinderhondas]" > To: 2cylinderhondas@yahoogroups.com > Cc:
> Subject: [2cylinderhondas] Battery Cap Popped Off!
> Hey all!
> I just wanted to run this by you to see if there's any input you may have!
> Today, I started up my N600 (after about 4 months of non-use) and moved it out of the garage so I could do some work on my CR-V.  Then later tonight, as I was moving it back into the garage, just as I turned it over, I heard a loud pop come from the engine bay.  As I popped the hood and feared for the worse, I saw that the battery had popped off one of the two caps and even cracked a bit (DieHard about 4 years old).  Anyway, I pushed my N600 back into the garage and as I look to replacing the battery, is there anything else to be on the lookout for?
> Thanks!
> Marty
> San Francisco, CA

[Bob Bondiett]

I agree. There might be a short somewhere close to light off the hydrogen from the battery. Like maybe an arcing spark plug lead.

> From:
> "juniselect@... [2cylinderhondas]"
> To:
> 2cylinderhondas@yahoogroups.com
> Sent:
> Wednesday, April 15, 2015 10:57 PM
> Subject:
> [2cylinderhondas] Battery Cap Popped Off!
> Hey all!
> I just wanted to run this by you to see if there's any input you may have!
> Today, I started up my N600 (after about 4 months of non-use) and moved it out of the garage so I could do some work on my CR-V.  Then later tonight, as I was moving it back into the garage, just as I turned it over, I heard a loud pop come from the engine bay.  As I popped the hood and feared for the worse, I saw that the battery had popped off one of the two caps and even cracked a bit (DieHard about 4 years old).  Anyway, I pushed my N600 back into the garage and as I look to replacing the battery, is there anything else to be on the lookout for?
> Thanks!
> Marty
> San Francisco, CA

[Bill]

Check all the cells with a battery hydrometer.  The one that popped (cell) may have high voltage.
See the following for more information…
https://www.youtube.com/watch?v=SRcOqfL6GqQ