hi

i love my yellow top optma battery BUT it weights 45.6 lbs .

sooo is there a battery that is lighter that will have enough power to start my car .

what say yee ?

thank you !

I guess we all should already know what your car is.

Lithium vs. AGM


Weight

Lithium batteries are on average a third of the weight of their lead acid counterparts. When you consider some RV battery banks, this can save 100s of pounds. Some RVs with large battery banks of four or more batteries can see a drastic drop in weight which will help with engine performance and fuel economy.

As an example, the Group 31 AGM battery runs at a hefty 69.5 pounds vs. the X2Power lithium Group 31 battery at only 28.2 pounds. If you have a large RV with a battery bank of 4 deep cycle batteries you could easily save over 150 pounds. While it doesn't sound like much, weight savings puts less strain on the engine and potentially boosts your fuel economy. According to the Environmental Protection Agency every 100-pound weight reduction equates to roughly a 1-2% increase in fuel economy. When you have a large RV, delaying a fill-up by even a small amount is welcome.

Check the price on a lithium battery though. You can buy a lot of gas for the difference...

I checked into the lithium battery at the local battery warehouse and there were two factors.. One was an old style charging system might not charge it correctly, a modern computer/ECM system with a temperature sensor is highly recommended with that style battery... Secondly I was told they don't like any high temp environment and battery life suffers{including the case swelling}... They could have sold me one and I wouldn't have known the difference I was only looking at the weight savings without really researching... At least they were honest about it...

My yellow capped repro battery has the smaller AGM inside. I want to say it's lighter than 25lbs. It's pretty light, and it lights up the car like a big boy.

There are. But they aren't cheap. 43# is .04 in ET. I'd live with it.
Doug

Here's an interesting link describing the problems associated with the lithium battery.. lithium battery as a start battery

Here's a 7lb. group 24. Mopar Action talked about them in Feb and Apr 2022. I don't think there's any battery management in them, so that may be risky.
https://4xspower.com/product/xv2400/

These are 15lbs, but include battery management, and have built in, wireless jump start.
https://antigravitybatteries.com/products/starter-batteries/automotive/ag-24-rs/

Here's their propaganda
https://youtu.be/jl3xJMdOoSE

May as well just fill your tires with helium for all the benefit of weight savings you are going to get at those prices.

AGM motorcycle batteries will get the job done at a much cheaper price. FAST racers have been hiding them inside of hollowed out full size batteried for years.

A no brainer for my 1000cc V-Twin Super Duke with carbon fiber wheels, fenders, chin spoiler, seat, titanium dual exhaust pipes and muffler, etc., hi 10's, low, low 11's at 127+ MPH quarter mile.

The OP asked about "BATTERY WEIGHT" not price, function or reliability, seems that in racing or other applications has ALWAYS been the tradeoff for light weight or less weight.

I was tired of the super heavy sixty something pound Interstate in my old Police car and was thinking of relocating to trunk when someone here recommended a lithium battery. I researched quite a bit and ended up buying one and it's been over two years and problem free. It weighs 11 pounds and has more cranking power than the huge Interstate and the charger that came with it is not much bigger than a cell phone so I can carry it in the trunk. Mine is Braille brand.

Mopar guy complaining about price. Go figure.

A12, am I reading that correctly, the red topped battery in you picture is only .8 lbs????

Anyone thinking $1k for a battery to save a few pounds is a good deal needs a chaperone.

Yes 0.8 lb. if I breathed on it, it would go to 1.0 lbs so that is still 1/6th of the weight of the AGM lead/acid original battery. On a race bike it's the only way to go. Most all of the off-road and motocross bikes are electric start (except Suzuki ? ) and they either come with a lithium light weight battery or that is what mostly everyone goes to if the AGM battery needs replaced. My Super Duke is now well under 400 lbs down around the low 300 lbs according to the Summit Racing NHRA track scale.

To be fair, they are supposed to last three times as long, so if you think of it like synthetic oil costing three times the price, but lasts three times as long, and is better all around to begin with. Also, taking 40lbs off the highest, furthest front corner of the car isn't just a few lbs.

Correct

Anyone have a 15yr old lithium battery?
I'm cheap, the battery for my car is $75, I don't care how much it weighs.