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Registered
Join Date: Dec 2007
Posts: 1,231
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AGM Batteries
I discovered this morning in the -7 degree weather that my battery is dead on my A4. A local Advance Auto and NAPA both stock a 730 and a 760 CCA battery. One is AGM (absorbed glass mat) and one is not. The difference is ~$30. Is it worth it to get the AGM or is that just a gimmick?
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01-04-2014, 04:34 PM
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canna change law physics
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The advantage is they are maintenance free and can't leak. The Optima is an AGM battery. Are they "better"? In general I'd say no. They have some advantages in not freezing and lower sitting discharge rates. On a regular car, I don't see the nee.
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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01-04-2014, 04:50 PM
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83 911 Production Cab #10
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How old is the A4 battery?
Costco Canada drop Optima because there was too many returns. Plenty of google result from; https://www.google.ca/search?client=safari&rls=en&q=agm+battery+vs+standard&ie=UTF-8&oe=UTF-8&gws_rd=cr&ei=47rIUv-wHMqFyQGu14HIDQ Whats the difference between lead acid, Gel and AGM batteries and which will give the most power? - Yahoo Answers FAQ about AGM Batteries - First Start Batteries Life expectancy of a AGM (gell cell) vs. a lead acid battery - Moderated Discussion Areas
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Who Will Live... Will See  83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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01-04-2014, 04:58 PM
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Registered
Join Date: Jan 2006
Location: Clayton NC
Posts: 1,674
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Just got rid of the leaky batteries in the 70T. Periodically had to pull them to clean up and repaint. PITA. Never again. Installed Miata AGM batteries which are lighter and shouldn't leak. Cheaper too. Time will tell on reliability. So far so good.
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gary 70T coupe forever almost done 88 Carrera Targa diamond blue |
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01-05-2014, 03:53 AM
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canna change law physics
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I suspect in a few years, we'll be using LiFePo4 batteries for cars. They last longer, have very high discharge rates, are smaller and weigh much less.
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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01-05-2014, 04:05 AM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,190
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They seem to work and last really well in miata. I've had a few (agm batteries and miata).
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01-05-2014, 06:35 AM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,957
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Quote:
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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01-06-2014, 07:20 AM
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83 911 Production Cab #10
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Quote:
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Who Will Live... Will See 83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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01-06-2014, 07:33 AM
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canna change law physics
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Quote:
You might also consider this, or possibly two in parallel. Alien Motion 12v 22 Cell LiFePO4 Heavy Duty Lithium Ion Battery (Right Positive) : Amazon.com : Automotive It is a LiFePo4 12V, 22 cell battery, with up to 400 Amps draw. I know it says it is for 2000cc, but I expect it will work in the 911. Weighs 3 lbs 5oz and no acid. You can mount them in any position. Two of them would definitely fire off the 911! Weight would be 6 lbs 10 oz.
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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01-06-2014, 07:59 AM
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Too big to fail
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The way I understand it, Optima batteries used to be good; then they got bought my Interstate, corners started getting cut, manufacturing moved out of the US (Mexico?) and quality went into the sh#tter.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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01-06-2014, 09:13 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,885
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Sounds about par for the course.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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01-06-2014, 09:19 AM
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Too big to fail
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I have an Optima in one of my buses that I bought in 1997, and it's still working. I have another one I bought the mid 2000's and it's dead.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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01-06-2014, 09:52 AM
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abides.
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I have heard, but have been unable to confirm, that the most recent Optimas are good again.
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Graham 1984 Carrera Targa |
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01-06-2014, 11:07 AM
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Did you get the memo?
Join Date: Mar 2003
Location: Wichita, KS
Posts: 32,561
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Quote:
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‘07 Mazda RX8-8 Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc |
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01-06-2014, 11:39 AM
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Too big to fail
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I need a battery to replace the dead optima, but haven't pulled the trigger yet. Are Odyssey batteries worth the extra $100+ over the Optima?
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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01-06-2014, 01:03 PM
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1970/1982 Porsche 914-6/911SC 2.7 RS
Das Babe
Das Babe Metalberiech
1984 Porsche Carrera Targa
