For mostly track car. what batteries are you using. And images of rear trunk installation.
Not a great photo but it's the best that I have right now. Car is stored and not readily accessible.
Look into Antigravity Batteries. They are lithium batteries with protection electronics, and are very lightweight. I have one in my spec boxster, and so far it's working great.
They aren't cheap though. But they do run sales about once a quarter, so sign up for their email list to get the announcement .
I got my lithium battery at advance auto 2 years ago....autocraft LFP-8 for like $89. Evidently they have been discontinued, can't find a current price or availability. It starts my /6 just fine even after cranking with ignition off for 20 seconds to build oil pressure. It's listed as 500CCA and weighs about 4 pounds--remarkable.
Here's the closest I can find currently....Amazon listing for about $200...
https://www.amazon.com/Lithium-Battery-Cranking-Replaces-YTX20HL-BS/dp/B078BBJPMG/ref=sr_1_3?dchild=1&keywords=lithium+500+cca+battery&qid=1596934853&sr=8-3
That's a pretty good deal for a lithium battery. I've heard that some of them require special chargers to avoid ruining the battery. Is that the case for the Autocraft battery?
Vision AGM model HP 12-116W,commonly used in speedway and track cars in my country,very low discharge rate when unused and very long life ,I purchased in the middle of 2015 for $58nzd (mates rates) and still starts my 6 easily,very impressed with it and it only weighs 9lbs from memory.
Frankly I don't care for a huge heavy battery when you don't need it,the only downside is the terminal connections being so small.
I custom built a battery tray and can also take the higher capacity version of this...needs be.
I've got the Odyssey PC680 which is the tiny AGM similar to above, which is mounted on its side in the factory battery tray. It holds charge well - I disconnect for storage - and cranks my fairly high compression 2.7/six just fine.
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