Is the "AGM" battery junk?

3866 Views 6 Replies 5 Participants Last post by Dennis Jurs, Feb 8, 2001

Z06jerry

Discussion Starter · Feb 4, 2001

I guess you can add me to the list of those who have a problem with the new AGM style battery. After about a month of non use, I found my battery was flat. It would not take a charge from a battery charger. I junp started the car and it would not charge the battery either.

Thanks to Dennis Jurs for posting the following link;

www.de-srv.com/vette/

which contains the statement " a (AGM) battery may be returned to normal service if it has a state of charge over 65%"

Question...... does that mean if it is below 65% that it cannot be recharged? I can't recharge mine!

The owner's manual states that the battery should be disconnected if the car is not used for 25 days.

Jeez.. that's not very long.... I left my for about 30 days (in a heated garage) and now the battery is junk?

GM's gonna have to replace a lot of these under warranty!

I think I'll buy an "old" technology battery and save myself some future headaches!

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Jerry
'01 quicksilver/black Z06

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Dennis Jurs

· #2 · Feb 4, 2001

Jerry:

Don't junk it just yet. Put it on a battery tender, that charges at a 1 or 1.25 amp per hr. rate. If the battery is down (mine was after just six weeks in storage) let it charge for several hours. If you have a 15 amp hr. battery, it will take 15 hours to fully charge, a 30 amp battery will take 30 hours etc. Mine took over 24 hours to charge fully, but the tender keeps her up now.
Try that first, battery tender is cheaper that a new battery. The Vette seems to have a fairly big power draw when shut down, over time. This also happened on my 97, so it is not just the AGM battery.

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Quicksilver Z06

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CorvetteSS

· #3 · Feb 7, 2001

I think the battery is improved. At least it won't leak all over the engine compartment like the older batteries had a tendancy to do.

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SSPORT IT UP!!!

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National Corvette Museum Member #4641
2001 Speeday White Z06 Corvette SS
2001 Navy Blue Metallic Coupe

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Z06jerry

Discussion Starter · #4 · Feb 7, 2001

Corvette SS, its true that it won't leak so I guess thats an improvement, ...but it also won't start the car! From what I've been reading (mainly in the other place), I'm not the only one with this battery problem. When I first noticed my brakes sticking I thought it was unique to my car, but it is affecting a lot of guys too, and I suspect the same will be true with these batteries. I wish GM would get there act together and issue a TSB for both of these problems.

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Jerry
'01 quicksilver/black Z06

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Zippy

· #5 · Feb 7, 2001

I thought the AGM was supposed to be a "new & improved," battery? Don't you just hate that over used cliche?

Zippy

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AmishVette

· #6 · Feb 8, 2001

Mine went dead after only 3 weeks in the garage. It's been very cold - But, my 70 LT-1 started just fine with a conventional battery!

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QS/Black - Stock Z06
99 Z28
70 LT1 T-Top
70 Z28 RS
Amish Buggy (1 H.P.)

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Dennis Jurs

· #7 · Feb 8, 2001

Guys:

I am not jumping on the AGM bandwagon, but I think the C5 seems to pull a lot of juice from the battery even when shut down.
If you are storing a C5 for any extended period, I highly recommend a battery tender. It will keep any good battery charged, when used properly. Some guys even take the batterys out or disconnect them, but why screw around?

If your battery is drained all the way down, then a battery tender will NOT be able to charge it, because it needs to sense at least 3 volts to begin the charge. If this is the case, you need to jump start your car, then hook up the tender when the battery has charged some.

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Quicksilver Z06

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