Amazon.com: NPP Power HR12200W FR, 12Volt 1200W 200Watts/Cell AGM Sealed Lead Acid Rechargeable High Rate Battery, Replace 12V 55Ah 12Volt for Off Grid UPS, Solar Power, RV, Marine, Boat, Golf Cart Battery :
12V 55Ah LiFePO4 Lithium Iron Phosphate Deep Cycle Battery | Aegis Battery
Mighty Max Battery 12V 55AH Internal Thread Battery for 14XL and 14X Rechargeable Sealed Lead Acid 12550 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com