I have a 2014 mustang GT convertible 5.0L it has an intrusion alarm that was installed before i purchased the car.I purchased the car June 2019 and from what i gathered had already had the battery replaced as it didn't have a motorcraft one it had a motomaster one installed,in march 2020 i replaced it with a new one as for some reason it would not hold a charge that long and now it's Oct 27 ,2021 and the battery is dead flat again i know that one of the main reasons is i don't drive it i have only put 1800 km on the car since i purchased it so i was wondering how long do these cars usually hold a charge for i last drove it Saturday sept25,2021 and i went to start it today and it's absolutely dead, if there is that much of a draw on the battery will my 2A battery tender keep it charged....i will charge the battery this weekend as we are getting slammed with rain at the moment and saturday is supposed to be sunny maybe i'll get it charged and put a permit on it....i was wondering if there is anywhere specific i should look at for the draw