cell6ida

I just installed a brand new DEKA EXT-18L. It cranked up right away, then I drove the Vette around for 30 minutes, shut the car off at a store, the came out of the store 5 minutes later and restarted the Vette.

When I restarted the Vette, the volt meter went down to 11, and my radar detector shut off. The speedometer lights started pulsing, but eventually it went to 14 on the voltmeter….Until I came to a red light ….then it started creeping down towards 13, 12, and would probably have crept to 11 again if I didn’t get a green traffic light when I did.

I secured the battery cables with the Odyssey SAE terminals ODY-3217-0006.


I hope I didn’t waste $100 on this battery. This brand new DEKA is acting like my last battery did before it went bad.

The one I just replaced with the DEKA is still good, but I wanted to save some weight. I might be putting it back in since it works fine, and the lightweight battery is acting.... like a lightweight.

What am I doing wrong?

Thanks

TSLAVette

I'd say lightweight. CCAs are low so the question is how well can a battery intended for individual watercraft and motor bikes power a big V8. I think you may have answered the question. Keep us posted and good luck!

FloydSummerOf68

Not sure what the problem is. Mine is having no issues at all and it stayed at idle for about 8 minutes at a bank drive-through lane.

I'd make sure that your radar detector doesn't cause a constant drain while your car is off.

Many people run this type of lightweight battery in daily drivers for years without issue, so it isn't the type of battery that is the problem itself, but it certainly isn't a battery that should be running a car with various aftermarket electronics.

Kenny94945

Check the cables.
Make sure battery is mounted securely.

Test battery at Pep Boys etc.
Check alternator - fuse and output.

FloydSummerOf68

Make sure the SAE terminals are torqued down VERY well or they'll come loose when your positioning the battery on it's side. I retorqued mine 3 times before I was happy with it.

LS1LT1

If the radar detector is plugged in and 'hot' for any type of extended period (though I wouldn't think that a mere 5 minutes could cause it, especially on a brand new battery) the entire time that the car is off it could start to eat into a smaller/lighter battery's power supply. And yes, the cheaper (ie: non lithium) lightweight batteries and aftermarket amps/subwoofers/lighting generally do not get along well.
It can also be a 'combination' of things as well. Perhaps the radar detector was plugged in and 'on' and you'd left a door or hatch open for a period. Or you were listening to the radio in accessory mode for 15 minutes then went on a short ride (I've seen multiple short trips eat up a smaller battery that had sat for a few days) that didn't give the alternator enough time to recharge the battery. Or it just wasn't shipped fully charged as they're supposed to be (not likely that).
These cars have A LOT of electronics and computers in them and some of those features have 'memory' systems that can and will cause a constant drain on the battery over time.

dennis50nj

i have left my doors open just to sweep the car out, and the battery wouldnt start it again

JoesC5

GM spent $$$$$$ trying to get the correct combination of weight vs cranking power when they selected the battery size in your Corvette. Look at what they spent on reducing the weight of a Z06 vs a base coupe. After all that engineering expense, and the much greater expense of using an aluminum frame, magnesium engine cradle and roof frame and carbon fiber floorboards, front fenders and front wheel housings, they put in a heavy 600 CCA lead acid battery instead of a 340 CCA lightweight battery intended for motorcycles and snowmobiles, in the lightweight Z06.

LS1LT1

Good point.
But as with most (all?) aftermarket performance modifications we do tend to make the necessary sacrifices for the sake of even more speed (as minute of a gain as it might be) and giving up some of that 'stock battery' reliability is worth the downsides for some.

That being said, my small battery frustrated the crap out of me recently so I put my original/full size one back in and it's been such a total pleasure. The car just feels/sounds like it starts better/easier with the big one in, even when the lighter one was fresh/fully charged.

oldmansan

I have the same battery. Mine is 3+ years old and I have no issues at all. It's possible you got a bad battery, but not likely. Since your last battery showed the same symptoms before it died, I'd verify your charging system is working properly.

San

LS1LT1

Yes I was going to mention that as well, it could actually be a weak alternator or even a low idle issue possibly?

jpee

I went in the other direction.. (Optima Yellow Top) heavier, BUT.. I run my fan for 10 min after each run, (with the motor off) and have NO worries about starting....

As for the extra weight if I was going to dial 12.65 with the OEM battery, now I dial 12.66 (Problem solved)

cell6ida

Just to clarify......The battery I just replaced was working fine....I only changed it out for the DEKA, to save some weight.

The one that I had a year ago or so went bad as many CORVETTE batteries do.......and the DEKA is acting like the one that went bad, not the one that was just in the Corvette.

I'm probably going to switch back to the good battery that I just took out.




Anybody want to buy a nearly new DEKA?


Also my radar detector is hard wired to turn off when the ignition turns off, and turn on when the engine starts.

oldmansan

I would but mine is still going strong.

Seriously, have you had the battery tested to determine that it is indeed the problem? The Deka has worked for plenty of forum members here.

San

LS1LT1

Yeah in a case like that where consistency is key, you're gaining more from having that extra battery 'reserve' to run the fans while the car is off than you would from simply saving 20-25 pounds.




True, it's very rare to see their batteries go bad when they're brand new as they're almost always shipped fully charged/tested and they're also very well made.

VET4LES

Have you charged the battery? Many new batteries need charging before using. They can sit on a shelf for months before being sold. I always put a charger on a new battery before installing it.

dennis50nj

i have used the braille B14115 for 4 years its only 11.5 lbs, it could go 3 weeks in the garage and still start. then it went to 2 weeks, then a week, it would always start the car fine, but if you leave the radio on, door open, or even start in the garage pull out shut off to go in the house come out and it might not start. if you have the radio on and the headlights and your siting at a stop sign with the brake lights on, you will see the amp gauge go down further and further, as there is not enough reserve, i also have the under drive pulley, so you might have a bad battery, whats your idle rpm?