battery

[ERICDSM]

so i was watching tv and the show 2 guys garage was on and they where talking about lithium ion batterys. They said that if the battery dies you can push a button on the battery and it will have enough charge to start the car. I thought thats was pretty cool. Has anyone used one? and how much are they going for?

 

[92AWDHX40]

I never used one where have you looked for one, im sure they arent hard to find if there on two guys garage.

 

[ERICDSM]

I tried to googlel it but i couldn't it kept pulling up batterys for electric cars.

 

[estoyaqui30]

Here's the website for it Lithionics Battery, but there seems to be no North American distributors yet. does sound really cool though.

 

[ed1380]

Buy 5 of these.
HobbyKing R/C Hobby Store : Turnigy 5000mAh 3S 25C Lipo Pack
wire them in parallel and it'll supply 600+ amps. 4 will supply 500A.

Or 3 of these for 600amps
HobbyKing R/C Hobby Store : Turnigy 5000mAh 3S 40C Lipo Pack

You'll need 2 of these.
http://www.ebay.com/itm/One-4-GA-to...ion_Blocks&hash=item5ae881ee3e#ht_1436wt_1397

 

[PieEyedPiper]

Buy 5 of these.
HobbyKing R/C Hobby Store : Turnigy 5000mAh 3S 25C Lipo Pack
wire them in parallel and it'll supply 600+ amps. 4 will supply 500A.

Or 3 of these for 600amps
HobbyKing R/C Hobby Store : Turnigy 5000mAh 3S 40C Lipo Pack

You'll need 2 of these.
One 4 GA to Four 8 GA Power or Ground Distribution RF | eBay

Crazy idea. I mean, I power my 38gram 4ch helicopter with those things.

Do you know of anyone doing this?
I'm just thinking about LiPo's in general, you know, about how they don't hold a charge worth a damn (for an emergency purpose like this) and how you'd generally want to store them with something like a 2/3's charge.

 

[ed1380]

Small lipo's can't handle the current, but I've welded alligator clamps together with my plane batteries. Its a $7 11.1v battery that's rated for 50 constant amps.

You are right about long term storage. Normal charging is up to 4.2v per cell, and storage is 3.9v. Also you have to balance them about every 5 charging cycles. So it would be a pita for a dd and I'm not sure how they'll react to a car environment(voltage spikes, frequency from the alternator, etc)

But it would be great to just start the car. Use the lipo to start it and then disconnect. And have it run on alternator and one of those emergency exit floodlight batteries(12v 4ah)

 

[Sebba]

Lithium polymer batteries are an accident waiting to happen.

 

[T is for TURBO]

Lithium polymer batteries are an accident waiting to happen.

How so?

I work with a guy who is in the process of making a lithium ion battery pack for his car. I believe he is using 4 cells which is more than enough to start a car. I think he said the total weight will be right around 5 pounds.

 

[Novec64]

so i was watching tv and the show 2 guys garage was on and they where talking about lithium ion batterys. They said that if the battery dies you can push a button on the battery and it will have enough charge to start the car. I thought thats was pretty cool. Has anyone used one? and how much are they going for?

Correct me if I'm wrong, but don't Optimas partially recharge themselves if they aren't run the whole way down?

 

[Sebba]

How so?

I work with a guy who is in the process of making a lithium ion battery pack for his car. I believe he is using 4 cells which is more than enough to start a car. I think he said the total weight will be right around 5 pounds.

They spontaneously combust.

Correct me if I'm wrong, but don't Optimas partially recharge themselves if they aren't run the whole way down?

Nothing significant. You aren't supposed to run a dry cell battery down like that. If left for any period of time it's life will be greatly reduced.

 

[T is for TURBO]

Look it up.

They can explode. I know, but so can the gasoline in a car.
They are used in cell phones all around the world, yet I don't hear about people blowing their hands off.

They are just as safe as lead acid as long as they are properly managed.

 

[boricua86]

They spontaneously combust.

A normal car battery can spontaneously blow up too! As with all chemical reactions
some are more stable than others.

 

[Sebba]

They can explode. I know, but so can the gasoline in a car.
They are used in cell phones all around the world, yet I don't hear about people blowing their hands off.

They are just as safe as lead acid as long as they are properly managed.

Gasoline doesn't just explode. LiPo batteries do, and they are nowhere near as safe as lead acid.

You're going to be exposing it to extreme temperatures for extended periods of time. You're asking to have your car burnt to a crisp.

 

[snowborder714]

http://www.dsmtuners.com/forums/road-course-autocross/435643-lithium-batteries.html

 

[ramsack]

I'd like to see someone try some ultra/super capacitors as a battery.

 

[T is for TURBO]

I'd like to see someone try some ultra/super capacitors as a battery.

I read something a few years back, (I wish I could remember where) that a company, or research facility was trying to develop a slow discharge capacitor. Instant charge, ultra slow discharge... I don't know if it will ever be possible, but it would be pretty revolutionary!

 

[ramsack]

An ultra slow discharge would make it not a capacitor anymore, but simply a battery. A battery has many farads, but can't charge and discharge at a fast speed. Capacitors are typically low in farads, but can charge and discharge very very fast. The ultra- or supercapacitors they've come out with have somewhat battery-like capacity, while being able to discharge quickly. This allows them to deliver full voltage almost up to the point of being fully discharged. They simply turn off when they run out, while a battery just loses voltage slowly. I wanted to experiment with these capacitors to put an HID headlight on my bicycle. They're really going to get crazy when they can start manipulating graphene.

I wish I could find this video I saw a while ago of a Leyden jar where they charged it, took it apart, put it back together, and it still had a charge.