In this video batteries are further explored. Note that batteries were touched upon in part 4. Lead Acid batteries are heavily used in Solar PV Systems. In this video the types of Lead Acid batteries in terms of their composition and design have been explained. Topics include Flooded batteries, Gel batteries & AGM batteries. It should be noted that AGM batteries are called Dry batteries in Pakistan.
Deep cycle battery design is best for use in solar PV system, however mostly cold crank batteries are used because of their availability. Lastly the video also explains Amperehours and how one can find out the time a battery will last for a given amount of power withdrawal.
Part 4: https://youtu.be/WxXqWhKfo5A