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Chuck,
I have the HDS 7 touch and ran my battery out during the Marina Del Rey Halibut Derby, but it was on the 2nd day on hour 17. My 6v 12a bait tank battery ran out about an hour earlier (but it is old and not real efficient). I bought the 6v back in the middle of 2013 and the 12v before that.
DandPt,
Lots of advantages on the LiFePo4 batteries over lead acid:
Weight (about a 1/3)
Life (10x)
Circuit board protection (overcharge rate and total, over discharge rate and total)
No Memory (don't have to completely discharge before recharging to maintain run time)
Among other advantages.
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