vettenut

We lost power for about four hours. When it cam back on I noticed the Battery Tender had a solid Red light and a blinking Green light. How could the Corvette battery discharge during a power outage?

michaelinmech

See Battery Tender info below - IMHO your battery may have lost a couple small % during the non charging period and the Tender is just filling it 100%. I would be surprise if the Green Light does not return to solid green in just a very short time.

"GREEN FLASHING - When the green light is flashing, and
the red light is on, the battery is greater than 80% charged and may
be removed from the charger and used if necessary. Leave the
battery on charge until the green light is solid whenever possible.
Once the green light begins to flash, it will remain flashing until the
battery charger output current drops below the optimum recharge
threshold, or until the absorption timer expires."

RicK T

Mine does that even when I unplug it for just a couple minutes. I don't think it keeps the float charge at 100%, but something less than that, so when it gets interrupted it reverts back to a 100% charge initially. That's only what I think based on experience, don't know for sure.

Red08

With battery tender hooked up and showing the constant green light, all I have to do is open the door for a few seconds, and it loses some charge. My guess is that the battery tender is so sensitive, that it detects even the slightest change in battery charge.

Z06pete

Some battery tenders because of there electronic circuitry design if left hooked up to a battery and not plugged into a wall socket, or not receiving any electricity because of a power outage. Will discharge the battery it's hooked up to.

TerryL

Whaaaaa?

Z06pete

Electrical engineer stuff hard to understand huh?

TerryL

Supporting data I could understand but unsubstantiated opinions, no.

dvilin

LIE2ME

That's correct. My tender has a warning sticker on the side of the unit that basically says if you unplug the unit, or the electricity goes out, the tender will procede to suck all the juice out of a perfectly good battery...

Gary '09 C6

I observe the same...

cclive

A tender keeps a surface charge on a battery at about 13.2 to 13.5 volts. As soon as the tender is removed or loses power, the battery starts to dissipate the surface charge and return to its' resting voltage of about 12.8 volts. It will always take a certain amount of time to come back up to the higher voltage, and that is when the light changes color or stops blinking etc...it varies by the brand of tender...mine goes solid. When the door is opened, the load on the battery is many amps...at least one per light bulb plus computer etc...this will rapidly pull the voltage down as it is much more load than the tender can offset.

TerryL

Want does that sticker actually say? Having trouble with something that has no power source and should not complete any electrical circuit or cause a short that would drain a battery and I've used Deltran battery tenders for years with no such experience.

Rathmullan

I worry that when unplugged, my tender drains power while still connected to the battery. You'd of have the same effect during the outage.

Meanwhile, with the tender connected an plugged in I get a red light for several minutes on the tender after just starting the car up and shutting it down.