This document discusses different types of batteries used for renewable energy storage. It describes flooded lead-acid batteries, sealed maintenance-free batteries, and their characteristics. Some key points covered are:
- Flooded lead-acid batteries require refilling with distilled water periodically but are less expensive. Sealed maintenance-free batteries such as AGM and gel batteries do not require watering but are more expensive.
- AGM batteries use absorbed glass mat technology which allows them to be sealed and maintenance-free while providing vibration resistance. Gel batteries use immobilized electrolyte gel instead of liquid.
- Battery types like flooded lead-acid are suitable for deep cycle applications and gradual charging/discharging. Sealed types