KS-21
We have these batteries specially fabricated by the Surrette factory.  The extra tall (25.5”) case allows 5” of electrolyte above the plates.  This cell incorporates a positive plate .25 in. thick.  This battery is designed for maximum cycles and infrequent watering. Expected to last 15+ years in service, this battery has a 10 year warranty (3 years unconditional, 7 years pro-rated), and is among the toughest, longest lasting lead acid you’ll find anywhere.  Capacity is 1000 amp-hours at 20 hour discharge rate.) Designed for maximum cycles and infrequent watering. Refill with distilled water as needed. Note: the KS-21 is a special order battery and usually requires 8 weeks to ship from time of order.  shipping information
Surrette KS-21 12-vdc 1000 AHR string (6 cells) 
6.25”L x 8”W x 26”H (including terminals), 140 lbs. each
$ 2220
Surrette KS-21 24-vdc 1000 AHR string (12 cells) 
6.25”L x 8”W x 26”H (including terminals), 140 lbs. each
$ 4440
Surrette KS-21 48-vdc 1000 AHR string (24 cells) 
6.25”L x 8”W x 26”H (including terminals), 140 lbs. each
$ 8880