Here is Trojan's lab cycle life chart for their various lines of batteries. Both the venerable T-105 and the Group 24, 27 & 30/31 are considered "Signature Line" products but Trojan specifically breaks out the cycle life of the Group 24, 27 & 30/31 from the T-105 level batteries. As can be seen the T-105, L16, T-125, T-145 etc. all cross the 50% DOD to lab cycles line at about 1200 cycles and the Group 24, 27 & 31 cross it at about half that or 600 cycles.


Both "Signature Line" groups of batteries get the same deep cycle label but one group delivers just half the cycles in the lab. Same sticker, half the performance...? Fair? Honest?


















Let's compare the *cost of two SCS200 Group 27's and the cost of two T-105 GC2 batteries.




Two SCS-200 (G27) = 230Ah
SCS-200 Cost = $187.00 X 2 = $374.00
Cost per Ah = $1.62
Cost Per Cycle @ 600 Cycle Lab Rating = 62¢
Cost Per Cycle @ Half Lab Rating = $1.24



Two T-105 (GC2) = 225Ah
T-105 Cost = $129.00 X 2 = $258.00
Cost Per Ah = $1.15
Cost Per Cycle @ 1200 Cycle Lab Rating = 22¢
Cost Per Cycle @ Half Lab Rating = 43¢



**My local cost from my Trojan distributor.