BrendaMY

Thank you guys so much for all the advice above! 

Looks like simply disconnecting the negative pole is quite easy and feasible, I think I'll just go with it.  Also trickle charger is really a good gadget that I didn't know before, although I may feel more relaxed rather have everything unplugged/powered off while I'm away for a long time, maybe I'll get one of those anyway someday in case of need.  Thanks again, all! 

Don't want to face a dead battery when I come back two months later (it's an old car and this already happened once). So normally what can you do? Is the Honda dealer supposed to have relevant service that can help in a way or another? Or do I have to find a friend who can help look after and charge the battery by starting the car once a week or so?--quite an unlikely solution to me.  Any other solutions suggested please? Thanks a lot!