Periodically Start Over the Winter?

Hey all, I am from MN, this year I have to keep the ATVs and RZR in a storage unit. There is no power for a tender unfortunately. I plan to do some riding over the winter. I am trying to decide if I should just take the batteries out, leave on tender and reinstall as I ride (kind of a pain), or just start them up every couple weeks (assuming the batteries make it that long without dieing.. lol)?

Thanks!