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A charged lead acid battery should read 12.8 volts, by the time it is at 12v it will only have about 40% charge and any further discharge will damage the battery, other battery types will be different, as your is the hybrid version, i am not familiar with the battery technology used, but if its not holding charge, then either the charging system has an issue or the battery does.
 

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Super Moderator
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not a great result, but it sounds like you at least know what is happening, id does sound like a software glitch though, rather than a hardware failure, its the software not switching the hardware on correctly., good luck with this and hope you resolve this sooner than later.
 
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