The Rolls Surrette S1380 (S-1380) Deep Cycle Battery features a high cycle life with thick positive plates and a large liquid reserve. The S1380 (S-1380) is a 2 Volt battery in al L-16H size. Rolls Surrette takes the L-16H size battery to even higher levels by improving the capacc ity and service life. This battery is unsurpassed in reliability. The model S1380 (S-1380) has a capacity of 1380 amp Hrs. @100 Hr. rate or 1050 amp Hrs. @20 Hr. rate. Connections are easy due to the thick lead alloy threaded stud. It is packaged in a light weight structural molded container with lifting rope handles. Warranty is 7 years ( First 24 months replacement, next 60 months prorated ) For a Single String 1380 AH Bank @100 Hr, you will need 6 of the S1380 (S-1380) for a 12 Volt System, 12 of the S1380 (S-1380) for a 24 Volt System and 24 of the S1380 (S-1380) for a 48 Volt System. Each additional string will multiply the AH.