Deep cycle batteries are designed to be discharged down as much as 80% time after time, and have much thicker plates. The major difference between a true deep cycle battery and others is that the plates are SOLID Lead plates - not sponge. This gives less surface area, thus less "instant" power like starting batteries need. Although these an be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 50% discharge.
Solar Charger is later convert solar energy into electrical energy which is stored in the battery, the battery may be in any form of storage device, generally consists of solar cells, batteries, composed of three parts regulating member.  The batteries are mainly lead-acid batteries, lithium batteries, nickel metal hydride batteries, the load can be mobile phones and other digital products, the load is diversity.
Solar charger Product Type
Type a solar charger with lighting features, built super energy-saving LED lights, very low power. If it simply used for LED lighting, according to the size of the built-in battery capacity can be used three hours to 30 hours.
Type II comes with charging function solar charger, this charger with no any other extensions. The advantage is this type of large-capacity charger, very suitable for professional external power supplies.
Type III support power adjustable stop solar charger. The general support 5v, 9v can be adjusted.