I would highly recommend picking up a Ctek MXS5 or similar trickle charger/battery restorer. They have fantastic technology in them to desulphate the plates and extend the life of the battery. Can bring them back from the dead and keep them in good health if you aren't using your car for a while.
Can get an MSX5 on special for about $120 around black Friday or Boxing day from Repco. Or $150 standard price at PBTech. Could potentially pay for itself quite quickly with the extra life you could get from your battery.