Battery Time...after searching, a couple of questions
03-04-2012, 03:59 PM
#1
Pro
Thread Starter
Battery Time...after searching, a couple of questions
Did my search....several posts refer to Optima Red Top 75/35.....last go around, my local independent shop (very strong reputation and good shop) installed Optima Red Top 75/25.....??
1) Going to do replace myself this go around....should I be looking for Optima 75/35 or Optima 75/25....what is difference?
2) Do not drive the car near enough, would the Interstate MTP-91 be a better choice? Leaning toward staying with Optima.
I do have the CTEK/Porsche trickle charger, however, I am leery of using it...doesn't seem to function properly...
97 C4S
Thanks for any input....
1) Going to do replace myself this go around....should I be looking for Optima 75/35 or Optima 75/25....what is difference?
2) Do not drive the car near enough, would the Interstate MTP-91 be a better choice? Leaning toward staying with Optima.
I do have the CTEK/Porsche trickle charger, however, I am leery of using it...doesn't seem to function properly...
97 C4S
Thanks for any input....
03-04-2012, 04:11 PM
#2
Nordschleife Master
Denny,
My only input is to plug a 12v source into your cigarette lighter socket to keep your ECU and stereo alive while swapping batteries. Its a PITA to get those ECU readiness codes set, and to avoid having to find your stereo code.
My only input is to plug a 12v source into your cigarette lighter socket to keep your ECU and stereo alive while swapping batteries. Its a PITA to get those ECU readiness codes set, and to avoid having to find your stereo code.
03-04-2012, 04:22 PM
#3
Rennlist Member
I just went through this decision myself.
It does not appear that the 75/35 is available - I could only find a local 75/25 (and every internet search I did for a 75/35 linked me to a 75/25).
It does not appear that the 75/35 is available - I could only find a local 75/25 (and every internet search I did for a 75/35 linked me to a 75/25).
03-04-2012, 06:09 PM
#4
Rennlist Member
Well that is one reason to keep a battery maintainer connected all the time.
I had the choice of going with an AGM battery but chose to stay with a regular Flooded Lead Acid battery based on what I know about batteries. I can maintain a FLA battery; I can't maintain an AGM or GEL battery.
AGM batteries have some advantages, but none of them are important to most of us. I can get into the details as to why if anyone is interested.
What makes you think "it doesn't seem to function properly"? Did you take some measurements?
I just tested both my CTEK 3300 units in the lab at work. The charger worked with the exception that it did not enter any form of a "maintenance" mode as advertized. Instead it just switches off at the end of the charge cycle and switches back on when battery voltage drops back down to 12.8V. That method of battery maintenance isn't bad and in my opinion and experience is better for long battery life.
AGM batteries have some advantages, but none of them are important to most of us. I can get into the details as to why if anyone is interested.
I just tested both my CTEK 3300 units in the lab at work. The charger worked with the exception that it did not enter any form of a "maintenance" mode as advertized. Instead it just switches off at the end of the charge cycle and switches back on when battery voltage drops back down to 12.8V. That method of battery maintenance isn't bad and in my opinion and experience is better for long battery life.
