You need to keep some sort or charger on the battery. The three options I know are:
Plugging in to shore power
Having a solar panel connected to the battery
Having a battery tender connected to the battery
If your current battery is done and will not come back to life, you may want to consider replacing a 12v battery with 2 6v golf cart batteries connected in series to produce 12 volts. This will just about triple your usable amp hours. That is what I did when I killed my 12v battery.
Good luck!
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Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)
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