Costco 6v batteries

jgrimes wrote:
In general terms, how do trojans compare to interstate batteries?

When you get into the more expensive batteries like Trojan, Crown, etc., you're getting better ingredients and a more robust construction. They also tend to have more amp hours than a less expensive battery.
My own experience is that in some situations the Trojan is a better choice but, like Mena states, we use these batteries so infrequently that any brand should last a long time. Especially true if we maintain them.