Odyssey PC925 battery @ 4.9V after 1 week?!?!?!

Sadly I believe the PC925 is just too small capacity to run the electronics that are constantly draining power on the 360 with the engine off which are;
1. Bosch Immobilizer Unit (which also listens for Remote Control keyfob blips
2. Bosch Ignition ECU's powering the left and right banks (pair of)
3. You may also have a tracking system draining current too...

Before I moved onto Lithium batteries I found the PC1100 much more suitable and it could last much longer despite only being 1.5 pounds heavier (i.e. virtually nothing) it boasts 48Ah @ vs 28Ah's of the 925 which made all the difference. I never reached more than 2 or 3 days with the 925 which was just useless to me...

 

Agree with 360 trev above. Though, I'd still check for a drain somewhere. I've left mine alone unplugged for 2, almost 3 weeks and she starts right up. Stereo amps or other electronics draining it?

 

I bought into that Odyssey battery too based on all the posts here on Fchat. It doesn't work. Just go get a big battery.

 

I put the 1500 in mine and it holds up very well if I forget to put the charger on it.

 

I used one for a battery cycle (3.5 years) to test it out and it worked great for me. I left my car off a charger for a couple weeks each year while being serviced. I have a gated so there is no pump system priming my hydraulics when I open the door and I had it on a Granite Digital charger 100% of the time, still do now! I did change back over to a full size after reading that lot's of folks were having issues. I am using the big fat super heavy Odyssey now just to be in compliance. Plus one fine day I am going to install a bad ass stereo and don't want any unknowns going forward.

 

I have a pc1200 odessey i will use

 

I double checked my records for this battery and I installed on 2/3/14 and replaced it on 3/19/17. It worked well for me with the stock standard stereo and gated car with 100% connection to the Save a Battery maintainer. I am running the Odyssey 34R-PC1500 now and like any of the full size AGM batteries it is a very tight fit. and I have an improvised battery hold down due to space constraints. I am running a tie down strap around the battery and lower plate. I wish Shorai would make a battery for us.

 

My results have been better. I replaced a 9 year old PC925 just because I thought I should. It never failed to start the car. That was 2 years ago.

I plug it in after a couple days of non-use though and I don't lock the car in my garage. I use a non-approved Shumacher maintainer. I think it may undercharge it slightly. Resting voltage on the Odyssey batteries is 12.85 vs 12.9 (I think) for lead acid.

 

I used the PC1500 in my F355 spider, it is a brute at 800CCA. Great battery, had it for years, and sold the car with it

 

Let us know how you get on with mounting it. I see some guys report that they just bought longer J hooks and problem solved but I do not recall this being an option for me. Any longer was an interference with the cover installation. I am curious.

 

I didn't modify or change anything to install it on the 430. It fit just fine. Is the 360 battery compartment that different.