Can anyone offer an explanation as to what is going on?

Submitted: Tuesday, Sep 30, 2014 at 08:19
ThreadID: 109663 Views:3535 Replies:8 FollowUps:21
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V8 100 series petrol Land Cruiser.
Three times now we've had a totally flat starting battery - goes flat overnight. Nothing at all when trying to start. This time we measured the voltage and it was about 4 volts.

The viewing window on the battery was showing green (so at least one charged cell).
The occurrences have been over about a year and each one has been months apart from the previous. Once recharged the battery appears to be totally fine in between episodes.

When put on the 3 stage charger this time it initally sat on green (floating charge) for yonks before going to bulk charge and then as normal through the absorption stage back to float.

So any ideas on what is going on? What would flatten a battery like that? - it doesn't sit idle for ages - normally used daily.

Thanks in advance for any suggestions.
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