Is a LiFePO4 battery a LiFePO4 battery? Deep discharge to almost flat, right?

I have a uSDR uSDX+ play toy that I want to take out to the park. The
specs claim 13.8 @ 500mA.

If I go with an 8Ah battery, does the simple math mean I get 16 hours
out of a full charge? I will fall asleep way before that!

I am also wondering about just a 12v AGM golf cart battery... Works
for my Miata!

Thoughts?
Best regards,
Dan KJ5IZK

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