Hooray, another battery thread!

I know, I know, this topic has been beaten to death already, but it seems that every time the "what's the cheapest lightweight battery?" question comes up it's only in regards to a car that is a.) small displacement b.) not regularly street driven or c.) both. I need to pick a battery for the LS1 swapped RX7 in short order and want to go as light as I can without spending a fortune and still have the car start reliably on cold mornings or short trips to the store. The battery will be going in the passenger storage bin, FWIW. I've heard good things here about Deka before, any other suggestions? Minimum CCA I should be looking at?

Bumping this for the weekday crowd, since I know you're all diligently working.

Also interested.

I'm going to be removing the 45# battery out of the back of the Abomination and looking for something lighter and smaller to move to the front.

Hmm. You want small, light, cheap, reliable, cold morning starts in one package? That could be tough. How cold are the cold mornings? 50F? 25F?

I have one of these in my Miata. It's AGM, a little lighter than a full sized battery and will probably be happy turning over an LS

If you want a lot lighter than that, and it gets cold you're going to want a jump box at the ready. Or else spend $$$ and get something that will be truly amazing.

In my Civic track car I used an AGM powersports battery from Wal Mart. It was about $50 and is quite light. It has had no problem starting the car with temps in the 20s and 30s and can start it up several times moving around the driveway with no sign of wearing down. It exceeded my expectations.

I personally have decided that I prioritize bombproofing over magic in a battery. It's not a good way to save 10 lbs. The Targa Miata has an Odyssey PC925 and it has never failed to do what needs doing.

Seems that a lot of guys who post about the awesome lightweight battery they just got spend a lot of time posting about diagnosing battery problems.

I, personally, prioritize dependability over a few lbs.

Lawnmower battery for track. Real battery for street. Still cheaper than one lightweight battery, and less aggravating than dealing with the lightweight battery.

I run a Deka Etx16 @ ~$70 in El Rabbito but there is almost no draw but St he starter except for lights and two dash speakers. It's 325 CCA at~17lbs and I do keep it on a trickle charger when it's parked for long periods of times. I tend to get 3-4 years out of them before they croak.

I tried the 6lb 225CCA previously and it was only good for three cranks before it was flat.

I almost bought a lithium ion battery this last time around but I wasn't knowledgeable enough to be comfortable with those guys yet. Curious to hear if people have input on this as weight loss is key with low hp toys.

jfryjfry wrote: Seems that a lot of guys who post about the awesome lightweight battery they just got spend a lot of time posting about diagnosing battery problems. I, personally, prioritize dependability over a few lbs.

I ran a Hawker Odyessy PC 625 in my old BMW 318ti for years without any electrical issues what-so-ever. It never once failed to start the car, even during a nasty blizzard that paralyzed the area for a week

Shorai just like in every other "what battery" thread. It does light, it does reliable, it does it. Ive had a E36 M3 ton of them, ive had them for nearly a decade, zero failures, zero bullE36 M3, just light, awesome and powerful.

I'm surprised that nobody said, "Use capacitors"