This is hard to tell because a vehicle is meant to be driven. However, if you just drive it on occasion I would recommend leaving the vehicle on a trickle charger. This is a battery charger that is meant to very slowly charge the battery and keep it properly charged. However, even with this, the battery will eventually fail. A normally used battery can last many years but if the vehicle is not driven frequently then I would expect the battery to only last a couple years as inactivity just causes it to go flat. With a trickle charger it will prolong that.
If you can't get one now for this trip, I would just unhook the negative battery cable of the vehicle and I am sure the battery will last until you return.
Here is an article that talks a little more about this:
https://www.lifewire.com/what-is-a-trickle-charger-534853
Let me know if you have other questions. Thanks
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Thursday, September 17th, 2020 AT 3:38 PM