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Hello
My 2015 battery did a slow turnover. I was gone for 2 weeks and so the vehicle had not been started during that time. Admittedly it was cold when we got back. The car did start but the battery did exhibit that slow turnover? So, thought I would maybe do a 'charge' on the battery. I've done this with my past Vettes with no problem. But this is my first with a battery in the rear of car; and some additional connections to it?
So, what recommendations do y'all have so I can do this correctly.
I just use the 12V port under the trunk lid near the battery... that is what it is there for and is easiest if you have that connector for your battery tender.
The battery in my '19 just died a couple weeks ago.. should have lasted longer. I guess I didn't charge it enough. It had been over two weeks. Moving forward I'm just going to charge it once a week if I'm not driving it.
Changing it was not as easy as it could be, I'll say that.
So? instead of connecting directly to the battery I should connect to the +post in engine bay and then find a ground to connect to also?
If you don't have the cig adapter, then I would do this. You can use the bolt on the alternator as the negative. But seriously, you should consider a new battery. A five year old battery that's died won't be very reliable.
I just use the 12V port under the trunk lid near the battery... that is what it is there for and is easiest if you have that connector for your battery tender.
The battery in my '19 just died a couple weeks ago.. should have lasted longer. I guess I didn't charge it enough. It had been over two weeks. Moving forward I'm just going to charge it once a week if I'm not driving it.
Changing it was not as easy as it could be, I'll say that.
You shouldn't need to "charge" your battery if it sits for two weeks. If it's going dead in that short a time you need to get the car looked at because something is wrong. I've let my '14 sit for several weeks at a time with no tender or "charge" and it has always started fine.
OP's battery is 5 years old, it's time for a new one.
I don't know exactly how long it was, but definitely well over two weeks. Probably more like a month. But I had the little red light going on the dash like normal one day, and a couple days later went to start it and it was dead as a doornail, battery measured 4 volts when I pulled it out.
Not sure whether it could have been a defective battery, or something wrong with the car, or just my fault for not charging it.
I don't know exactly how long it was, but definitely well over two weeks. Probably more like a month. But I had the little red light going on the dash like normal one day, and a couple days later went to start it and it was dead as a doornail, battery measured 4 volts when I pulled it out.
Not sure whether it could have been a defective battery, or something wrong with the car, or just my fault for not charging it.
Something's wrong. Even if it sits for a month the battery shouldn't be dead. Mine has sat for far longer than that and it starts fine.
Yup, 2015 here too and my battery was also getting weak just a couple of weeks ago.. I always keep my tender plunged in when leaving the car sit for more than a week. I picked up an Ancel AD530 OBDII reader from Amazon; it has a really cool battery graphing feature that will read static voltage, starting voltage drop and charging voltage. If the voltage dropped goes below 7V, it's getting time to start looking for a battery replacement. Mine went down to 6.9-6.8V.
Costco has OEM replacement (flooded type) for less than $120 plus tax & License. I went with the newer AGM style (absorbent glass mat) for $185 out the door. Both made by Interstate Battery, both with same warranty; the difference between the two is the AGM will hold a higher charge for a much longer period of time before rapidly falling off.
So here's your options; replace it now and don't worry about it for another 5 years OR, keep a tender plugged in and don't plan on any cold overnights away from home without jumpers on hand.
IMO more than four years on a battery is a crap shoot, exacerbated by temperature extremes. Abnormal starting behavior is where the battery is most stressed and likely the first indication of a battery going walkabout...
The battery in my '19 just died a couple weeks ago.. should have lasted longer. I guess I didn't charge it enough.
I had a similar problem with the '17 I bought from a dealer lot.
Checking the door sticker "born on" date showed it was an early production '17 had been on the lot for 15 months before I bought. The battery failed six months later... Unlikely the dealership made any attempts to maintain the battery and sitting unused is bad for batteries.
Hello
My 2015 battery did a slow turnover. I was gone for 2 weeks and so the vehicle had not been started during that time. Admittedly it was cold when we got back. The car did start but the battery did exhibit that slow turnover? So, thought I would maybe do a 'charge' on the battery. I've done this with my past Vettes with no problem. But this is my first with a battery in the rear of car; and some additional connections to it?
So, what recommendations do y'all have so I can do this correctly.
thanks
Hmm, you're lucky! Replaced my September 2013 built C7 Z51 Battery in late 2016! One of the first on the forum to do so.
I had a similar problem with the '17 I bought from a dealer lot.
Checking the door sticker "born on" date showed it was an early production '17 had been on the lot for 15 months before I bought. The battery failed six months later... Unlikely the dealership made any attempts to maintain the battery and sitting unused is bad for batteries.
Mine came from stock at MacMulkin, and I did find a little slip in the console that said "last maintenance charge on date xxx" so I think they were at least making an effort to maintain it. I've had it since May '19.
The one in my C6 lasted 7 years, and that came from stock at Les Stanford, and I didn't have it in my possession until October '12 (it was a '12)
I wish I'd read that two weeks ago. Would have eased one of my minor pain points, at least.
Also, it at least partially addressed my question from earlier: If I'm reading it right, it is saying that normal parked battery drain is "less than 40mA" except for brief periods when Onstar is sending data, etc. And also that parked, battery will go from "80%" to what I assume is the threshold of starting, "50%", in 33 days. If the lights on my battery tender are to be believed, the battery in virtually any car is just under 80% most of the time even when driven frequently.
Maybe if I get motivated I'll get back under there and see if I can measure the parked amp load.
^^^
Yep, that info is from the 4 volume service manual. But battery life does vary. Temperature is a factor and keeping it on a charger is a help, but like people, each has it's own life!
Unlike some older Vettes the C7 does shut most power items off, even if you leave lights on etc. I seldom used my battery charger and went on vacation several times for 2 1/2 weeks. Some have said their battery started the car after 30 days.
I started using Deltran Battery Tenders back in 1989 when the battery would go dead after 2 weeks in my 1989 C4. The batteries lasted 10 years in the 1989 C4 using a tender. My 2016 is connected to a Detran Battery Tender now and the battery will be 5 years old this summer with no problems, I also can check the battery on my phone with the Deltran Wireless Monitor.
I appreciate all the responses. I decided to go the CTEK route. I asked the company what was the replacement for the 3300. I also asked what was used to make the Corvette version since they are the ones who make it. I got a quick response and the model is the MSX 5.0 and I was also told what accessory to get that would allow me to use the 'outlet' in the back of the Vette. I bought them via AMAZON and saved about $20+ over buying the 'Corvette' labeled model. I have used it and it works extremely well.
Battery charge
