I would check your connections first. Something isn't right. If slabbin is running the black box and a 10" unit all day on a 30ah no reason a 50ah couldn't do the same. You possibly got a bad battery, but I'm betting it's in your electrical connections or possibly your charger.
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I don't think it's the connections, because it came on & ran everything just fine from the start. All the connections from the Garmin 93sv & the black box are running straight to the battery ... no extra wiring or extensions are being used.
The charger works fine ... but it "could be" that I took the actual charge level of the battery as a full 100% charge (& it may not have been). That's why I'm letting it sit on the charger (maintenance mode) until I use it again.
10-4.. first time I went out with my livescope I only got 3 or 4 hours out of a dedicated group 27 wet cell. Turned out to be a bad connection on a butt connector. It ran fine for the first few hours. Not well versed in lithium, but from what I've read 50ah should be more than enough juice for an 8 hour day or better. Good luck, hopeful you get it figured out soon!
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Copy or take a pic of one of the LifePo4 charge tables and bring a DVM to check battery voltage when on the water.The charger works fine ... but it "could be" that I took the actual charge level of the battery as a full 100% charge (& it may not have been). That's why I'm letting it sit on the charger (maintenance mode) until I use it again.
Without some actual voltage measurements with a DVM, it can be a guessing game.
Good Luck
I wouldn't think your amp draw would pull a 50 amp down in 6 hrs. I hope you figure out the issue, and if the battery is defective, the seller will take care of it,