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However, perhaps a point that Dcasole was making is that a Battery Tender Plus, rated at 1.25 amps, does not constantly charge at that rate. Meaning the charge time calculation is not as simple as dividing the battery's amp-hour rating by the BTP's maximum charge rate. Because, as the battery's charge increases, the BTP's charge rate reduces.
I think we can agree that using a BTP to charge a dead battery (as long as the dead battery's voltage is about the BTP's minimum voltage requirement) is not the ideal method, but, it could be done.
The best place to jump it is at the battery under trunk mat for quickest way to get it going. If you just brought it home from the dealer it may have been sitting awhile and was not sufficiently charged or may have been jumped just to get it ready to go. I'm sure it is hard on the ctec unit to bring back a dead battery but it will do it. It needs to be able to get rid of extra heat it will produce charging that hard and long. That's with the 3 amp output. These cheap maintainers do not put out 3 amps! Some are even less than 1 amp!
It would probably be a good idea to space the units off the wall to facilitate air flow for cooling. I always feel the temperature of these units with my hand when I know they are under heavy use to check if they are staying cool enough to not damage internals.
Probably 20 minutes or so...and I had the media going at the same time. Had similar happen with my C6...should have known better. Anyway....I see on a youtube from a dealer how to jump start it. He used some kind of hand held starter but we have a newer Chevy trunk and thought about using that method...whatta ya think?
We also have Lithium Starter Batteries with WIRELESS BUILT-IN JUMP STARTING also... you would never need to jump start again, plus you save 30lbs over the stock battery. https://antigravitybatteries.com/pro...tive/ag-h6-rs/
We are having a Black Friday sales on the MINI Jump Starter.. our XP-10 models was rated #1 Jump Starter by Consumer Reports. We also have Lithium Starter Batteries with WIRELESS BUILT-IN JUMP STARTING also... you you would never need to jump start again
AGM batteries like that in our C7 are maintenance free but they can vent gas and will do so under extreme conditions such as with a very heavy sustained charge current. .
What year car do you have? My 2019 Stingray OEM battery is a wet battery, group 48, rated at 615 CCA. Wondering what years came with an AGM battery.
Last edited by ShadowGray19; Nov 23, 2019 at 06:30 PM.
Maintainers will not normally bring a dead battery back to full charge. The battery should be "charged" with a battery charger and then connect the maintainer to it when not in use.
I have run my C6 battery down a couple of times while working on it and successfully brought the battery back to life with my tender as it has a higher amp setting as well. Will it charge a fully discharged battery I dont know but would take a while for sure, in my case 1 or 2 hours was sufficient.
We also have Lithium Starter Batteries with WIRELESS BUILT-IN JUMP STARTING also... you would never need to jump start again, plus you save 30lbs over the stock battery. https://antigravitybatteries.com/pro...tive/ag-h6-rs/
We are having a Black Friday sales on the MINI Jump Starter.. our XP-10 models was rated #1 Jump Starter by Consumer Reports. We also have Lithium Starter Batteries with WIRELESS BUILT-IN JUMP STARTING also... you you would never need to jump start again
The best place to jump it is at the battery under trunk mat for quickest way to get it going. If you just brought it home from the dealer it may have been sitting awhile and was not sufficiently charged or may have been jumped just to get it ready to go. I'm sure it is hard on the ctec unit to bring back a dead battery but it will do it. It needs to be able to get rid of extra heat it will produce charging that hard and long. That's with the 3 amp output. These cheap maintainers do not put out 3 amps! Some are even less than 1 amp!
I luckily haven't had to charge my battery...but if I do, I would have to use my charger that doesn't have a cigarette lighter feature. I'm aware of the battery under the mat in the rear hatch, but where would you connect the negative clamp of the cables? Supposed to be to ground (haven't looked lately if there is a convenient grounding location--and sure I've connected plenty of cables in the past to both the terminals on the battery even though it's not the recommended procedure).
You can connect a battery charger or maintainer under the hood. At the alternator, pull back the black rubber boot that faces the passenger fender, connect your charger + to that bolt. Connect your - clamp to the alternator body.
And yes, a maintainer that is rated at 1.5 amps (or whatever its rating) will output that current on a continuous basis, and will be able to fully charge a dead battery...it just will take a while...approximately the AH rating of the battery divided by the output current rating of the charger. Charging it slowly is better for the battery, as slow charge rates minimize outgassing. The only thing is that if the battery is so dead that its terminal voltage is below the chargers "start" voltage, the maintainer or charger won't start charge mode. You can jump-start the charge mode by momentarily connecting a good 12V battery across the dead battery and charger.
