Starter battery or called cranking battery aka car batteries, those you found use in automobiles used for starting the engine. They are design to give a high current for a short duration, eg to start the car engine. Should not drain more than 30% of the capacity and need to charge them back immediately. The plates used in these batteries have thin lead coatings and big surface area for high surge current. The problem with them is due to the thin lead, they tends to drop off and then the battery lose capacity. That is why if you forget to turn off the car headlights and the battery get drain off too much, you need to change the battery already because the lead plate are already damanged.
Deep cycle batteries have much thicken lead plates but smaller surface area and can be drain down to as low as 10% of the rated capacity and then charge back to full capacity, they works great as long within the life cycle of the battery. They are not so suitable for cranking cos their surge current is not as high as the cranking batteries.
You can buy the Trojan deep cycle batteries from YHI. One 115Ah (25kg) cost me $150. You need a proper charge to charge them, don't use those car battery chargers, you'll kill them by overheating them.