Sealed lead acid battery
Positive characteristics
• Sealed, and so much safer than standard lead acid.
• Extremely high current output - low internal resistance - extremely high conversion efficiency (gel 85-90%, AGM 95%).
• No voltage depression (“memory” effect).
• Low cost.
• Low self discharge (2-10% per month.
Negative characteristics
• Does not like deep discharging.
• Can (permanently) die suddenly.
• Cannot be fully charged.
• Heavy.
• Low storage density.
• Reduced capacity with increased temperature (50% with each 8°C).
• Reduced capacity under heavy loads (Peukert Effect), although not as bad as lead acid.
• Cannot be stored flat.