[2ndgen]

Just researching in anticipation of replacing my original factory battery--which is over 5 years old now.
I'm pretty decided on going to a LiFePO4 battery, probably one by AntiGravity--I like their anti-drain cutoff feature.
They have offerings of 24, 30, 40, 60, and 80 Ah in H6, H7, and H8 sizes which would all fit.

I believe the stock flooded is somewhere around 80Ah.
I'm thinking 60Ah would probably be just fine since many cars these days have batteries around the 50Ah range.
Would 40Ah be too low for any reason?
With the stronger CCA of the LiFePO4 chemistry (70% vs 45% of flooded Pb) shouldn't that make a lower Ah remain suffcient?
Any idea what the total vehicle max-use-case current draw is while on with the HK playing? (it's 825 watts)

 

[lws]

why would you want to do anything but the highest rated one? I guess i live in the north where it gets cold and we grew up buying the biggest battery that would fit in a car.

 

[2ndgen]

Because it's already quite pricey, and adds more weight also. Granted, the weight savings are already pretty good. Stock H7 battery is 48lbs, stock H8 battery is 56 lbs.

AntiGravity:
40Ah is 15.6lbs 1500 CA is $830
60Ah is 18.5lbs 1800 CA is $950
80Ah is 25.5lbs 2000 CA is $1200

Some of the other options:
Kepworth 40Ah is 11.9lbs 1100 CA is $380
powertex 66Ah is 16.5lbs 1250 CA is $550
powertex 84Ah is 21.2lbs 1600 CA is $650
Darrell Cox ?Ah is 9lbs 1200 CA is $746
Braille 20Ah is 8.5lbs 1000 CA is $790
Braille 25Ah is 9lbs 1950 CA is $2100

 

[quiller303]

I have had an AntiGravity for a few years now. Went with the 40Ah. More than enough power. No issues.

 

[lws]

Just researching in anticipation of replacing my original factory battery--which is over 5 years old now.
I'm pretty decided on going to a LiFePO4 battery, probably one by AntiGravity--I like their anti-drain cutoff feature.
They have offerings of 24, 30, 40, 60, and 80 Ah in H6, H7, and H8 sizes which would all fit.

I believe the stock flooded is somewhere around 80Ah.
I'm thinking 60Ah would probably be just fine since many cars these days have batteries around the 50Ah range.
Would 40Ah be too low for any reason?
With the stronger CCA of the LiFePO4 chemistry (70% vs 45% of flooded Pb) shouldn't that make a lower Ah remain suffcient?
Any idea what the total vehicle max-use-case current draw is while on with the HK playing? (it's 825 watts)

825 watts at 12 volts= 62 amps. I dont know stereos real well but im guessing that is per channel. So at wide open your probably drawing north of a 100 amps. But that said who runs an 800 watt stereo wide open. Youd probably be deaf before the battery went dead

 

[MJS73]

The only thing the battery does is start the car. Once the car started, the alternator provides power for the accessories and electronics. And while voltage is continuous, ameperage is not. Amperage in the circuit is determined by the draw, so a 12V/12W load will only show 1A in the circuit.

 

[2ndgen]

825 watts at 12 volts= 62 amps. I dont know stereos real well but im guessing that is per channel. So at wide open your probably drawing north of a 100 amps. But that said who runs an 800 watt stereo wide open. Youd probably be deaf before the battery went dead

825 Watts is total--adding all the speaker channels up. Not sure the exact limit on the amp itself.

 

[2fast4u]

I would say if you are going LiPo then 60ah min...agm at least 80. Lithium batteries have much better initial amp supply, hence the reduced need.

 

[baabootoo]

Dang, are all you guys hedge fund managers???????????

 

[lws]

The only thing the battery does is start the car. Once the car started, the alternator provides power for the accessories and electronics. And while voltage is continuous, ameperage is not. Amperage in the circuit is determined by the draw, so a 12V/12W load will only show 1A in the circuit.

correct but if the stereo is running on accessory without the motor running it wont last long with a 825 watt stereo. It can also drain the battery if you pulling more amperage then the alternator can handle. Its why guys with BIG stereos run BIG alternators and a dedicated battery or even multiples for the amps.. youd probably be ok with a 60 amp hour battery if you keep in mind its possible to drain it in an hour if your at the beach or somewhere else with your stereo going without running the car. You dont even have to drain it flat. Just enough that thers not enough amps left for your starter to turn your car over well enough to start it. Me? Id go big. I really doubt if something with the power of a hellcat is going to see enough benifit loosing 10lbs to even show up on your time slip and surely not on the street. Theres just way to many other variables that mean more in a race then 10lbs.

 

[MJS73]

correct but if the stereo is running on accessory without the motor running it wont last long with a 825 watt stereo. It can also drain the battery if you pulling more amperage then the alternator can handle. Its why guys with BIG stereos run BIG alternators and a dedicated battery or even multiples for the amps.. youd probably be ok with a 60 amp hour battery if you keep in mind its possible to drain it in an hour if your at the beach or somewhere else with your stereo going without running the car. You dont even have to drain it flat. Just enough that thers not enough amps left for your starter to turn your car over well enough to start it. Me? Id go big. I really doubt if something with the power of a hellcat is going to see enough benifit loosing 10lbs to even show up on your time slip and surely not on the street. Theres just way to many other variables that mean more in a race then 10lbs.

Run any car stereo for an hour or more and the battery is going to be dead. Having the car sit in the Run position for an hour or more is a bad idea, no matter how big a battery the OP buys. Get a good Bluetooth speaker if you want tunes at the beach.

And to the OP, the current draw at 825 watts is 825 watts ÷ 12 volts = 68.75 amps. And CCA are measured at 7.2 volts, not 12 volts, so it's not an apples-to-apples comparison. Just get something that meets OE specifications and you'll be fine.

 

[baabootoo]

Did anyone ask what temperature you'll need to start the car in? The warmer, the lower you can go.

 

[lws]

i dont run my challenger in the winter so that isnt really a consern and excessive heat can effect batteries too. But like i said earlier up here we were taught to put the biggest battery that would fit in a car because most are driven in the winter.

 

[Deano 379]

FWIW, yes the alternator provides power when the engine runs. However, if the alternator fails, you are dependent on the battery to power everything to get you home, a safe place or a repair facility.
Therefore, I get the largest battery with the highest reserve rating, if it does not have a reserve rating, get one with the highest watt hour rating that will fit. An H-8 will fit the Chargers and Challengers. Also, lithium batteries are not only lighter, but have a flatter discharge voltage and can be discharged deeper (if needed) than can an AGM or lead acid battery.