I think my original Banner battery is failing after 6 1/2 years. It failed to start the car, after a charge my Optimate 3 charger was showing a fault. I've topped the cells up & disconnected it & its on charge again showing desulphation . If still faulty I want one that just drops in without any mods. I'm favouring the Exide AGM 13-31, a pity the Varta A14 has wrong terminals & its taller. Had excellent performance from Varta 19 years on a vintage Sunbeam. Will my Optimate 3 charger be OK with AGM batteries? It says it good for GEL, MF & STD , it charges at 0.6A constant current & can be left on float charge but I dont usually. Reading on the Optimate web site it seems MF ( mantenance free) is an alternative term for AGM
