naw, troyz's just being troyz. :icon17:

my car hibernates 4months sometimes up to 5-6months depending on weather. no issue. 40psi+ and on flatstoppers.

I'm inclined to believe that you have a bad charger. I'm not sure exactly what the parasitic load is but it's not that much and being a sports car has nothing to do with the situation.

How did you test it? I would use two meters - one measuring volts (with and without the charger) and the other measuring current.

I've been using mine for 2 years and nothing wrong with mine so far.

My town has been spreading salt like it's going out of style, just at the threat of flurries, so the Z is parked and covered for the winter. I have my BT Jr. on my Seadoo battery right now, but I'll swap them and see if I can get the green blinking light instead of the constant green light on my regular BT (not sure if it's the Plus or not). Interesting topic and thanks for sharing the manufacturer's recommendation.

It's possible the charger is bad, however I followed the procedures given to me by the manufacturer and the charger is supposedly fine. I also used the same charger on my other car (97 maxima) and it was working fine and the light changed to solid green after a couple days (and I verified the battery voltage on the maxima had increased). So I really think it would be a waste of time to try another BTJr when it's a substantial annoyance to drive 4 hours just to get access to the car (round trip).

And yes, modern cars these days have lots of processors and computers that are drawing power when the car is off. It's entirely plausible the quiescent draw of these cars is higher than typical. On the phone they told me flat out that the Jr. would not work properly on this car, so regardless of whether or not I buy the Plus version I'm not just going to ignore what the manufacturer says about their own product.

and my G and Z are both modern cars and are floating fine, so as many others who use battery tender on their modern cars. so to me, if it's not the battery tender, and if it's not your battery, then it's your car.

did you say you bought the car used? if so, there might be a reason why the original owner sold the car..

im not sure if doing a PSA from one bad experience on your one car is a good idea or not? :confused: not enough proof or testing when you are probably the only one person with a z that mentioned having problems with the battery tender? i could be wrong but i dont remember reading any other z owner here complaining about the battery tender?

and the sales assciate you spoke to at deltran. :shakes head: probably just wanted to get rid of you.

my suggestion is you check youtube on how to test parasitic drain. some cars (even stock) have more drain than others.

^ I agree with Kenchan. I have 2 Battery Tender JR I bought from Amazon one for my Z and the other for my Supra and both are doing fine on it....so far.

Have to agree, I have not had any issues with mine. I use one on the Z and my GSXR1000

My car goes into storage for 5 months without any battery tender on it and it starts right up on the first crank. You have some sort of larger parasitic draw than normal.

I'm about to put my Nismo to sleep for the winter. I figure if I just start her up every month or so and maybe give it a drive around the block I should be ok. Or would a trickle charger be better in this case?

you will have moisture inside your exhaust system which will sit there for a long time. trickle charger will over charge your battery.

if you're not going to get one of these battery tenders or the alternate black&decker one, you can either unplug the battery, or drive your car every 1-2wks for 10miles+ each time.

All valid points. Plus, at the price of trickle/float chargers nowadays, probably not worth the time/effort to troubleshoot.

But there does appear to be something wrong somewhere. I'm not familiar with the BTJr but, judging by the comments of those who are, it should do the job. If it's not the charger then I suspect you have an above normal parasitic load for some reason. I'd put a meter on it and check - if for nothing else than my peace of mind.

Please keep us informed as to what you find out. My curiosity is piqued.

The PSA part of my post is because the manufacturer that makes the charger said it isn't supposed to be used on the 370z. Their words, not mine. Take that information as you will but I have already verified my charger is not faulty and neither is my battery/z. Making claims that my Z is somehow damaged from the previous owner is beyond asinine. Especially since "parasitic load" isn't damage in the first place, and there's no way the previous owner sold the car because of that. I actually know the reason the previous owner sold is because they couldn't make the payments. Not that it matters at all.

Those of you who claim your battery tender jr. has been working just fine on your Z - Have you actually verified that with a multimeter? And was this during long term storage or were you also starting up and/or driving the car during the storage period? I have no access to my z in the winter so a tender is my only option (or nothing).

hummmm... in order to make this an actual PSA, can you ask the manufacturer wat the maximum allowed drain amperage is for the jr?

and what is the drain amperage of the 370Z they have on file?

would like to make sound decisions based on data, not based on potential xmas-season-hired-part-timer.. :ugh: :confused:

verify wat with a multimeter? verify the battery's cca using an ammeter you mean?

but why would i need to verify anything if everything is working fine the last 7yrs on one unit and 4yrs on another? :confused: