GodSquadMandrake

http://www.ballisticparts.com/produc...ies/16cell.php



3lbs, 500CCA, and it looks like a box of shotgun shells. This is a LiFePO4 or lithium iron phosphate battery.

The short version is that this is very dfferent from AGM or lead acid batteries and in some ways the behavior is opposite. It slowly releases the power and is a lot harder to kill, but it can't release the energy as quickly. The temperature characteristics also seem better than lead acid.

http://www.youtube.com/watch?v=AOzpYsLDUAM

Erix7rew

iTrader: (7)

I use a home made pack of Lithium-ion A123 4s4p that weight about 2lbs and easely start the FD The downside is i cant listen to music or open light witout the car running. The dimension is about 2'' x 3'' x 8'' and can be configure on demand!!

97SupraTwinTurbo

iTrader: (8)

With the smaller batteries there is more stress on the alternator during engine operation, an upgrade to a larger alternator might be needed.

RENESISFD

iTrader: (13)

^ Only if you have a sound system in the car, otherwise there is a constant amperage draw on the system, except when the fans kick on.



John

GodSquadMandrake

97SupraTwinTurbo and RENESISFD are you referring to lead acid, AGM, or lithium iron phosphate batteries? They have completely different properties. I've never seen a battery like the one in that video that starts of dead and gains more current. If a lead acid battery is dead, it only gets deader. This is something completely different and cannot be compared to lead acid. I grew up with the old technologies before we had lithium batteries and I remember my Dad's sailboat had (2) 80 lbs Trojan deep cycle batteries just to keep the CB radio and running lights working. I couldn't even lift one until I was 12. We had to be careful to tend those batteries so they wouldn't die. Nothing is worse than being caught in a squall without the ability to use the electric start on diesel motor or even the ability to use the radio. But now they have a 3lb battery that does the same. It seems unlikely, but this is the EV technology development.

97SupraTwinTurbo

iTrader: (8)

As long as you don't have a short in your system or something that draws voltage, if you do then even the advanced 3lb battery will die if you don't recharge it or add a battery tender over a period of time.


Renesis:

I actually ran a deka 12lb battery on my Z06 and I noticed during road racing that sometimes it wasn't operating the way it did with the original GM battery. It didn't seem like it had a strong enough spark, it felt like a light misfire. The engine was tuned properly, everything was perfect and the dyno numbers were up there. At times, it just didn't feel like it was firing properly because of the small battery because of all the electronics. When I would turn on the lights, I would hear the fuel pump whine. We all have to realize, the alternator is working overtime to compensate for the battery running accessories. The Z06 had a voltmeter, it read over 14 volts but I could hear the accessories not working at their peak performance due to the size of the battery. It's not all about CCA, I'm sure it was damaging the alternator.

got_hp

correct me if im wrong.......but i thought the car and all the electronics mostly run off the alternator.......the battery is only there for starting the car, or running electronics while the engine (and therefore alternator) is off.

can someone clarify?

its been over 12 years since i was into the car audio thing, but i remember when getting bigger more powerful batteries were a waste without upgrading the alternator.

turbojeff

iTrader: (30)

Battery is only for starting the car or probably in some low idle/high load conditions. Steady state the alternator has to do all the work.

My DD has heated seats, rear defrost, heated steering wheel and mirrors, I wonder what the alternator has to pump out to keep them working...

GodSquadMandrake

Ok I understand now. That's not really something I can accurately comment on though because I don't know exactly how much power the ECU, ABS ECU, fuel pump, injectors and ignition system drain. The FD came with a 100 amp alternator and your Z06 came with a 110 amp. You've got half as many ignition events on an FD and much less powerful ignition coils. That is going to count for a large majority of your draw. But the FD still has less electronics than the Z06. So I'm not sure that we can say that because your Z06 experienced some problems with a 12 lb deka battery, an FD would experience the same problems using a lithium iron phosphate battery. It seems like comparing apples to oranges to me. That 12 lb deka battery you were using had only 200 CCA and was AGM. This lithium iron phosphate battery has 500 CCA. It's difficult to compare the power ratings of these batteries because the measurements are designed for lead acid batteries but even so the 12 lb Deka had less than half the power and was in a car that had more draw. That really seems like comparing apples to oranges to me.

FD3S2005

iTrader: (11)

ahh good thing i got the upgraded alternator then,

97SupraTwinTurbo

iTrader: (8)

Your batteries are being used all the time people! This is a closed circuit. When your vehicle is being started, your battery works alone. As soon as your vehicle is running your alternator charges your battery & runs electricity through the system. That doesn't mean your battery is not working. There is electricity going through your battery especially to run accessories. If your battery didn't work well, your alternator would work overtime! It's a closed loop system and they're all connected. Look at wiring schematics and it's easy to see that if your battery is not property matched, your alternator will suffer and so will your engine due to insufficient spark.