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YOUR RESEARCHNew Battery and Refinished Tray
Leading reported evidence
Replace battery
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
I just replaced my battery with an Interstate AGM and must agree, I have never heard a 996 starter spin over so quickly.
Leading evidence: 'Replace battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'vent line' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check bosch a little closer' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Replaced all tray hardware with stainless steel because one of the nuts was so corroded I had to remove it with vise grips.
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Suspected cause
So you will find probably a vent line on them for when the battery gets placed in the interior.
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14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Last battery Die Hard lasted 5.5 years. Replaced with this Duralast Platinum AGM battery. Boy does it have some cold cranking amps. Spins the starter like I've never heard before. Got it from AutoZone for $203 including tax. It has a sticker on it that says "Made in Germany". Go figure. Had the battery tray sand blasted and refinished at a local metal shop. They did an awesome job. Replaced all tray hardware with stainless steel because one of the nuts was so corroded I had to remove it with vise grips. Just passing along some positive information.
I see that you don't have the tube connected (my Bosch battery donesnt have the otuput for the tube neither)
Have you guys ever seen a battery (aftermarket) with that connection?
No vent tube connection on this battery, nor on the Die Hard battery. I don't know if it is because they were both newer type AGM batteries. The old style lead acid batteries needed to vent.
Maybe debatable but I did find this -
AGM Batteries
. A VRLA
battery
(valve-regulated lead–acid
battery
), more commonly known as a sealed
battery
or maintenance free
battery
, is a type of lead-acid rechargeable
battery
. Due to their construction, they
do
not require ventilation, can be mounted in any orientation, and
do
not require constant maintenance.
A long read but a lot of information -
http://www.hendonpub.com/law_and_ord...ery_technology
My Bosch AGM battery has a vent. It didn't come with a fitting or tube so I transferred them from the old battery. I guess it's sealed vs non-sealed, not necessarily battery type.
IIRC Interstae batteries have the vent tube. My Interstate battery in my 2000 996 is six years old and still cranking strong. Interstate customer for life.
Check your Bosch a little closer. There should be vent outlets (holes) on both sides with one side plugged. Connect your tube to the outlet on the positive terminal side. This was the setup on the Bosch AGM H7.
AGM batteries under normal operation don�t vent. Only in very extreme circumstances. So you will find probably a vent line on them for when the battery gets placed in the interior. Anyway always good to connect the vent line. AGM batteries eliminate acid spilling in accidents because they are sealed. They can also be installed at odd angles.
An AGM battery does not like higher temperatures, so it needs to be located away from any possible heat source, less suitable for in-engine bay placement. So perfect alternative for the 911 with the battery located under the frunk.
The real advantage for our cars is that they are more resistent against deep cylce discharge then conventional flooded cell batteries, which results in longer longevity of the battery. They state up to 2-3 times.
AGM batteries have a lower internal resistance and can be charged at a much faster rate. This shouldn't cause a problem on the majority of vehicles as the wiring in the car is designed to handle the maximum rated output of the alternator.
I think it is certainly worth the extra $, even more when you do not drive the car that regularly or put the car away for winter hibernation. A trickle charger is always a good extra support to keep the battery charged at a good level.
Be aware you need a battery charger which is able to recharge AGM batteries. Especially when they are (almost) dead they need a different recharge cycle then a regular battery.
I must ask, are you sure that is the correct battery? I just replaced mine for an interstate AGM and it is a group H7 which is vented. Your picture shows you have an H6. Maybe that is why its not vented? Wrong battery?
That is definitely not the original size battery, which should have been a group 49 or an H7 AGM. You can see that it is about an inch or so shorter in the long dimension than the battery tray. Likely this will work OK, especially if the OP lives in a warmer climate. But the group 49 will provide more CCA and reserve power than this battery.
The battery tray refinish looks great!
Edit - just realized he is in Florida. The smaller battery should be fine.
Yes, I'm good with the H6 battery here in Florida. Was the same with the Die Hard that lasted for 5.5 years. In a much colder climate I would think about the larger H7 battery. The H6 uses the second bolt hole over in the tray. The Duralast H6 still comes in at a hefty 48 pounds. The battery tray definitely looked pretty beat up when I removed it. I tried to wire brush it and put a lick of paint on it but it really looked bad, so I turned it over to East Coast Custom Metal shop for a sand blast and coal black automotive paint. 2 hours and $30 for the refinish. They also were able to preserve the foam gasket underneath. I priced out a new replacement tray for $141 ($198 at AutoAtlanta), so I think I got a bargain deal and the shop did a perfect job.
As you can see from the picture of the refurbished tray (great job by the way!) there are 4 mounting holes; however, not all 4 may be threaded. The H6, H7 and H8 all have the same width and height specs with the H7 and H8 each about 1.5 inches and 3 inches longer than the H6, respectively. The H7 is a perfect fit for a replacement and it uses the hold down hole that for sure will be threaded. Both the H6 and H8 will work too but you might need to modify the hold down holes. BTW, all batteries vent, some (AGM) less than others.
This is a source reference. Confirm exact model applicability in the original material.
