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Hello, my name is Dan. Do you have a multimeter to do some tests? It sounds like battery could be shot if your sure it is charged and connections tight.
Monitor voltage while trying to start, let me know what it drops to. Also what year, model, make, and engine size is your vehicle? Thanks.
This would mean battery is shot, it should not drop below 11v. Replace battery, let me know if you have more questions. Thanks.
You can reply back to this answer at any time without additional fees, I'm 99.9% it will work. Keep me updated, thanks.