[modeleng] Battery problems

It was marked, sealed for life, I guess than when it "unsealed" itself, 
that was the end of its life!

http://www.lmandwr.co.uk/battery/battery_1.jpg
http://www.lmandwr.co.uk/battery/battery_2.jpg

More seriously, any ideas what could have happened?  This is a battery 
that is used in my Landrover (in series with the "normal" battery) to 
give me 24v for the diesel heater.  It comes out about once a month for 
charging.

It was put on charge a couple of days earlier on a 12v, 5A (trickle) 
charge, I came into the workshop yesterday to find this!

I have since charged a similar battery (same type) without any problems.

Cheers

Peter

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