DIY Lithium Jump Starter

[kje]

Anyone tried to make a DIY Lithium Jump Starter like the NOCO Genius Boost GB30 UltraSafe Lithium Jump Starter?

https://www.youtube.com/watch?v=q7xWhyr-dDI

 

[docnjoj]

Several folks have used A123 26650 cells as 4S 2 or 3P to make smaller jump start batteries. Check the search for "Jump starters for cars".
otherDoc

 

[kje]

Is it possible to use 18650 cells?

 

[wesnewell]

A cheap 4s rc lipo pack works great.

 

[kje]

Could I just use 3s 2p 18650 cells? How can I make it handle 400 amp draw?

 

[docnjoj]

A very few 18650 could run 10 amps. 4P is 40 amps.You need 400 amps. Hmmmmmm...........A1232650 or hobby Lipo like Wes suggested would work.

 

[kje]

I`m not familiar with A123 2650 cells. Is there a informative web page with the characteristics of different battery types?

Here is says A123 26650 has 120A rate: http://www.batteryspace.com/A123-Sy...O4-26650-Rechargeable-Cell-3.2V-2500-mAh.aspx
The rate is the possibility to draw high current for a short time?
Does it mean I can make a 4s 4p A123 26650 pack with 480A rate?

 

[docnjoj]

I`m not familiar with A123 2650 cells. Is there a informative web page with the characteristics of different battery types?

Here is says A123 26650 has 120A rate: http://www.batteryspace.com/A123-Sy...O4-26650-Rechargeable-Cell-3.2V-2500-mAh.aspx
The rate is the possibility to draw high current for a short time?
Does it mean I can make a 4s 4p A123 26650 pack with 480A rate?

As a 10-20 sec rate yes like for a starter battery. Obviously you could not run that battery continuously. Those prices seem high but Batteryspace is always high priced.
otherDoc

 

[spinningmagnets]

The "18650" designation means that they are a cylindrical cell, the diameter is 18mm, and the length is 65mm. It is the chemistry and construction that is important for high current (lots of peak amps).

The 26650 cells are cylindrical, 26mm diameter, and 65mm long.

You can either use a small pack of high-current 18650 cells (high "C-rate"), or you can use a very large pack of low-current 18650's. like the ones found in old laptops.

 

[999zip999]

What do you want it for ? Jump starting a car or truck ? All cars and trucks are different a small 4 cylinder Honda or a diesel truck you can see the difference it would take on the demands of a jump starter battery. So what is your flavor ?

 

[gensem]

13.2v 8.4ah roughly 110wh, the device you mentioned has 24wh of battery capacity.

http://www.hobbyking.com/hobbyking/store/__14074__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack.html

edit:

Cheap charger to go with it.

http://www.hobbyking.com/hobbyking/store/__22297__Hobbyking_ECO_SIX_80W_6A_2_6S_Battery_Balance_Charger_AC_DC_w_PSU.html

 

[docnjoj]

Here is some info from the source for A123 26650 cells. This might be helpful.

http://endless-sphere.com/forums/viewtopic.php?f=14&t=67622

otherDoc

 

[kje]

Thank you.

Ok, so it's like:
LiPo cells = high peak current
LiCo cells = low peak current

Is there another informative web page with the characteristics of different battery types?

I wanne jump start my 40 hp boat motor. I'm not sure, but I think 100A is more than enough. So if the motor is drawing 60A when starting, and I buy these Lifepo4 26650 cells and solder them as 4s1p I can jump start my boat motor? (The cells can deliver Max Peak Discharge: 115A)

Are all the A123 cells of Lifepo4 chemistry?

What kind of cells are the NOCO Genius Boost GB30 UltraSafe Lithium Jump Starter using?

 

[docnjoj]

Don't know about the cells you show in the link. Yes all A123 cells are LiFepo4 with some nanotech powder. The real ones are good stuff.
otherDoc

 

[mikebikerad]

I second the 4s lipo pack working great for this. A 5000 mAh 20C pack is fine starting my tacoma.

 

[mcintyretj]

I should have read this thread before I made my emergency jump starter.
I had a few of these packs from Doctor Bass that seemed almost impossible to disassemble. I made a simple 3s, 2p jump starter.
View attachment 2



I had an extra pack which I added for more power.


Next time I will go with 4s. The clips you can get at Home Depot for about $2.00

 

[Doctorbass]

Hio mcintyretj,

Well these packs dont have the C rate that is required to jumpstart a battery like that. If you want to have succes with these for that purpose you will need about 5 to 6 in parallel minimum and also use higher current connector than these PP30 30A connectors and 12 AWG wires :lol: it's like you will loose few volt just thru the connectors and wires between both battery.

I have posted how to dissassemble these pack using a dremel. you remove the two screw and cut the cell top nickel sheet and this allow you to remove cells easy and to keep enough of spotwelded nickel to solder on. :wink:

http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=28285&start=125

Doc

 

[Doctorbass]

Here is my own DIY JUMPSTARTER that i built in 2009

Very compact Lithium 300grams 12V battery jumpstarter using 4s1p A123 26650 cells. It is still working today in 2015. It is really powerfull for the size and 100% safe. It can boost about 10-10 cars before it need a recahrge. It can give few hundred amp easy and keep voltage above 11V.

When i posted it the first time in 2009, this video had over 110 000 view on YT before i got my account erased.

[youtube]F1FAtXhIJYs[/youtube]

Doc

 

[Doctorbass]

And the big mama version here:

That battery was able to power a 5000W rms Audio subwoofer amplifier and acheive a 154dB in a honda CRX

 

[Punx0r]

Some of these little packs might lack the current to start a car themselves, but I bet if left connected to the lead-acid starting battery for 10 minutes you would have a good chance of success.

 

[kje]

Here is my own DIY JUMPSTARTER that i built in 2009

Doc

Thats amazing stuff Doc. Thank you! Where do you order the A123 cells?

 

[Doctorbass]

Here is my own DIY JUMPSTARTER that i built in 2009

Doc

Thats amazing stuff Doc. Thank you! Where do you order the A123 cells?

These cells was from my local Dewalt service store. The cells came from the DC9360 packs. These no longer use the 26650 A123 cells now.

Doc

 

[kje]

Some users may have some lying around if you're only after a few for a jump starter project.

Yes, I'm only after a few for a jump starter project. Is there any users here having some lying around?

 

[gogo]

Have you shopped your local auto parts store for lithium motorcycle batteries? The offerings in my local store don't seem to have restricted discharge circuitry and might be great for jump starting.

Subject: Autocraft Lithium batteries @ Advance Auto Parts

 

[kje]

Is there any other options high current cells beside A123?
Is A123 just a manufactory?