Optima Batteries YTS4.2 8122540008882 VRLA 12 V 55 Ah AGM (W x H x D) 254 x 200 x 175 mm Cone pin Maintenance-free, Cyli | Conrad.com
EXP55-GEL 12V 55Ah Gel Deep Cycle | ExpertPower Direct
Starter OPTIMA BLUE 12V 55Ah 254x175x200mm battery - Vlad
Gruber Power 58EGPS-12-55-I 12V 55Ah Battery with F11 Terminals
Mighty Max Battery 12V 55AH, GEL Type, INT Terminal, AGM Battery Rechargeable Sealed Gel 12550 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Replacement Batteries for the 6FM55-X Vision - (12V 55AH) | eBay