ljugete

I too have an Interstate Battery and is going strong (perfect fit)!

gordo993

Red top Optima, here. Perfect fit, no problems!

ed devinney

I just put a Costco/Kirkland (Johnson Controls, same as Sears, etc) battery in my 951 and it pukes like a kid on a roller coaster on the track. Had to rig a catch can for the battey vent but got a couple ounces of acid spilled around.

The 993 might be different because the battery isn't oriented straight fore/aft, dunno. The Interstate in my 993 is dandy.

texas911

Optima here, can't beat the fact that you don't have to vent it plus the odds of rusting are greatly reduced.

LC997C4s

Having just had to deal with a battery replacement and searching the archives I went with the Odessey vs the optima red top.

Although its slightly overkill in terms of capcity and CCA the Odessey P1200T is a perfect fit. One can use the P925T but the smaller size will require to have to go some level of modification for attachment as compared to that of the 1200T with a simple preformed hardware strap that can be purchased.

Whomever mentioned earlier here that the optima and or odessey type batteries have less reserve or no reserve capacity is misinformed.

These batteries can be trickle charged with no issue.

If the car is not a daily driver then you should definitely look into these type of dry cell batteries.