Technical Explanations Technology SMF Cal/Cal – Sealed Maintenance Free Calcium Positive and Calcium Negative expanded plates Cal/Cal Maint – Calcium Positive with Calcium Negative expanded plates but maintainable for rehydration. Hybrid Maint – Calcium Positive expanded plate with Antimony Negative cast grid but maintainable for rehydration AGM Starting – Absorbed Glass Matt starting battery EFB SS Maint – Enhanced Flooded