MarCum Lithium Battery dud?

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I bought one of the MarCum Force 12ah Lithium Battery from Scheels recently.  On sale for $79.99.  I have the battery on a Hummingbird Helix 5 and it maybe lasted for 5hrs. I charged it another two times and same result, it went from 100% down to dead in less than 6 hours.  This is no longer than my 3 year old led battery.   

Am I missing a setting on the Humminbird, could I have a bad battery out of the box or have others had same experience with this Lithium Battery on similar flashers?

[Baetis62]

sorry to hear that...mine's a couple years old and lasts for two full days or more.  I'd contact Marcum. I've had to send a couple of my units in over the years and they were good to work with