Learn Me: Accord needs battery...LiFePO4?

Being a cheap bastard, and wanting to get rid of the 60LB boat anchor robbing room behind the passenger headlight, what's the scoop on these things in cars? I know Zoomby Woof and Mazdeuce ran/run them, so mainly looking to them. I really don't want to spend $130 on a battery, to be honest. The current battery in the Accord is who knows how old, is flat dead, and even after an hour long drive won't start the damn thing right after I shut it off in this 0 degree weather. I've had to jump it just about every time I drive it for the past week, and it's finally dead now. I'm sure I can get a battery from Honda with my employee discount plenty cheap, but since the opportunity has presented itself, lets try to burn the stupid thing to the ground! Keep it mind I drive this thing daily, and it goes about 2-3 days without being driven sometimes. I don't mind yanking a battery if I need to, especially something as small as the LiFePO4 batteries.

Car specs: 2.3L, 9.3:1 compression, 4 cylinder. Stock EVERYTHING electronically. Alternator is still alright.

LiFePO4 4s3p vs 4s1p. Difference? I already know the first number is the cell count. Second number?

Factory is a 24F BCI size, varying between 550 and 800CCA from what I can gather.

Are these LiFePO4 batteries really just plug and play once I change the connector?

My 2011 Accord has a lawn mower size battery. (JK).

Everyone wanted $110+ for a basic replacement. Costco had the Interstate brand for $65.

Do it.

The second number is "packs" which basically means you could cut a battery open and safely remove the second number in packs...doesn't mean much in terms of practical use.

I know LiFePo4 is extremely power-dense but has a fairly limited number of maximum recharge cycles. They're used in military drones.

BTW, IIRC the one in Zomby Woof's car is a LiPo (Lithium Polymer) not LiFePo4 (Lithium Iron Phosphate).

Very different battery that has many more recharge cycles and slightly lower power density, but is of a similar weight for the same density. Downsides are possibility of self-combustion and being dead forever if the voltage falls below a certain level.

If you want to lose weight and not break the bank look up Deka batteries. 11lBs I think, AGM, good cca, and it won't burn your car to the ground. I ran one in my civic. It was $90 shipped. I also ran battery post adapters which were another $10 from Amazon.

^I was thinking of that and then got caught up in nerdy stuff

$83 at Costco. Probably just gonna go that route, as it's the cheapest/decent one I can find.

The cheap lighter battery solution is the highest (300+) CCA lawnmower battery on the shelf. Should be adequate in winter if you're running 5wX or 0wX oil and it tends to light off without any trouble.

16lbs, 300 CCA, $38 http://www.tractorsupply.com/en/store/huskeereg%3B-lawn-amp%3B-garden-tractor-battery-360-cranking-amps#desc-tab

20lbs 350 CCA, $50 http://www.tractorsupply.com/en/store/briggs-amp%3B-strattonreg%3B-lawn-amp%3B-garden-tractor-battery-420-cranking-amps

http://www.walmart.com/ip/EverStart-Plus-26R-3-Lead-Acid-Automotive-Battery/28275669

Found that. Good enough. Drops the weight in half, lots of CCA, an inch smaller in two dimensons, and no need to buy terminals. In stock at my local Wal-Mart for $80.

Still may experiment with a smaller battery for autocross.

24F vs 26R old battery turned out to be manufacteres 12/2002

Whoa. Quite a size difference! It all worked out in the end.

In reply to GameboyRMH: usually LiPo has more power density but fewer cycles than LiFePo4.

advance auto + coupon

Zippy 4s2p 8400 LiFePO4, $85. Starts an LS1 just fine.

I'm now in the market for a new battery. After a month of being away, the battery of my 318ti died from it sitting in freezing temps. Even driving about 15 miles didn't recharge it enough to allow me to crank it over again.

Now I've got to figure out what kind of battery I want. Was thinking something along the lines of an ETX18 (or whatever those AGM batteries are called) but am worried that ~300CCA won't be enough. The car only gets driven once a week and only for 30 minutes (both ways) since I'm at school and don't really need to commute. I do want to get a lightweight battery for autocross though. What should I do?

I was thinking about getting a Deka or similar but my mechanic told me to stick with a full-size gel cell for a street-driven vehicle with a full set of electrical gizmos...and it doesn't even get cold here.

check your local Interstate battery distributor. They have "refurbs" cheap