Some tips that could help are -
a) Always keep check on the battery acid levels. Batteries without water can lose charge and it also reduces battery life!
b) Check for the proper connection of terminals. Loose connections tend to disconnection of the alternator ( which charges battery and powers electrical devices in car) .
c) During winters, start the car at least once a day. This helps the battery to keep working and gain charge.
d) Check for the proper working of alternator. It must work always to keep the battery running and prevents battery failure.
e) The terminals should always be carbon free. Carbon inhibits proper current flow which reduces battery life.
f) Factory charging - The car battery must be charged using chargers meant for it at least once an year or two. It increases life.
Follow the above rules and enjoy happy and long battery life!
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