Hi all, I realized that I never did link to these pictures from this thread to illustrate the kind of Interstate leaking I've seen. Right now, I'm thinking that one of the JCI brands (probably Costco) would still be my choice but I wanted to document the kind of stuff I see from a remote venting battery, northern climate, garaged car with a charging system that isn't overcharging. I can't seem to stop this.
After cleaning and checking everything, I applied foil tape covered by "clear duct tape" as an insulator. There doesn't seem to be any movement of the caps indicating a bad seal which someone asked me to check. This is a black top/black body MTP-93.
Link to pictures
Originally Posted By: Craig in Canada
After all of the recent battery discussion, I pulled my 2005 Interstate MTP-93 for inspection.
There was dried electrolyte around the caps, again, just like there always is. I took some pictures which I'll post later. The levels are good and, if anything, they're high. I suppose there's a possibility that my dealer overfilled them. I don't think I've ever added distilled water to this battery because it has never needed it.
I came home late last night after a 3hr drive and did this work this morning after a "rest" period. I tested the specific gravity and it was excellent - 100%. I have a four floating balls type of tester and all four floated. When my BMW factory battery was 5 years old it was somewhere between 50-70% according to this same tester.
I have pointed out in other threads that I have a maintenance charger with desulfation function. I had a toy car connected to it 24/7 but now that I don't have that car any longer I connect this car to it when convenient. At least once a week over night. This makes sure that the battery is fully charged (in itself preventing sulfation) and then kicks over to the desulfation function (supposedly reversing some levels of existing mild sulfation). Based on my specific gravity readings I'd say it is working.
I wiped everything down and then put a long piece of foil tape pressed down over the caps. I followed that up with a slightly longer length of clear duct tape as an insulator just in case. To answer others' questions - there was no play in the posts and no deposits in those areas.
Considering this is a vented battery, the discharge from the caps bothers me. The way the battery top is made there are drain channels from the caps down the sides of the battery too. Thanks guys - lets make sure that when you leak a little you dump it right into the spare tire well of my car to rot it out instead of hanging on to a little bit of it so that it can be seen and cleaned up.