I would buy a new battery, for around $100 you can prevent one of the most common causes of your car/truck not starting.
Think about having your truck stall in a busy intersection, and then not starting because of battery trouble - not fun.
I buy a new one every 4 years or so trouble with it or not. Particularly in my wifes car, because I know a dead battery would probably mean new car time...$100 cheaper than $30,000. Same goes for tires.
Cheap peace of mind
