- The Deka 8A27 (8A27M) is a direct replacement for any group 27 lead-acid, GEL, or AGM batteries.- Specifications:Nominal Voltage: 12V Amp Hour Capacity @ 20 hr rate: 92 a/h Reserve Capacity @ 25 amp discharge rate: 185 mins BCI Group Size: 27 Marine Cranking Amps @ 32* F: 900 amps Cold Cranking Amps @ 0* F: 580 amps Weight: 63 lbs Length: 12 3/4 in. Width: 6 3/4 in. Height: 9 7/8 in. Terminal Type: dual terminals (autopost and stud)