I am running a 9 amp hr for my HDS5 I have the same trouble battery is lees than a month old it will not run the meter for more than 7-8 hours then dumps, so I have either got a charger that is not accurate when it is full or the battery is bad already, I was trying to find out about another battery, different technology, I will try and find the battery type.
Keep me posted with what you find with the battery tender...
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