Re: Building lightweight Lithium car battery 10lbs!
 

]What is the difference between a acr relay and a battery isolator?
And need larger than 120 amp, minimum 180 amp.
Or does a acr work better for charging to different kinds of batteries like a agm as main and a lithium cell pack?
I would be putting cells together then either coating in tool dip, urethane undercoating / bed liner or making a box and pouring some plastic then taking out of mold.

TY
Speedy

Re: Building lightweight Lithium car battery 10lbs!
 

an acr (automatic charging relay) hooks between your primary and remote battery . when you start your car and the voltage of your primary battery goes over 13.6 (varies depending on manufacture) the acr combines your 2 batteries so your remote can charge . when the voltage drops below 12.9 it disconnects so as not to drain the main battery . we use them when we wire boats and have starting battery and House battery .

Re: Building lightweight Lithium car battery 10lbs!
 

If it looks legit I will buy one.

Re: Building lightweight Lithium car battery 10lbs!
 

How well would these work as house batteries on an RV?

Re: Building lightweight Lithium car battery 10lbs!
 

Any local Canuks interested on some of these cells? I wouldn't mind getting some, and due to the special shipping requirements for these, it would be easer to group ship them if anyone else is interested.


Also I haven't had a chance to do research on these cells yet, but anyone know the C rating of the cells.

Re: Building lightweight Lithium car battery 10lbs!
 

I see you have a Johnson IC pump, these fell out of favour when the Bosch 010 came out. They seemed to fail too soon, many people use them though so maybe I am mistaken. Replace it with the Bosch when it fails though. That’s my thoughts, l had a Johnson but I purchased the 010 and put it in as preventive maintenance the original was still working at the time.

Re: Building lightweight Lithium car battery 10lbs!
 

Funny you mention that. My Johnson pump has probably no more then 1500km since I installed it. I drove the car maybe for a week last year, and was having issues with excessive IAC temps. This spring I was going to see if by fluke a pc of Teflon tape or crud plug up the pump inlet (I could always hear the pump run, but being a mag drive pump that's not always the case). I have the "always on ic pump" mod, and noticed I was loosing power after a few min of driving, upon closer inspection, I was getting 60-70 +80c intake temps during casual driving.


I think I have a Bosch 010 in my stash of parts from another different project.




Yes its been a while since ive visited the forum, letalone drive my car :(

Re: Building lightweight Lithium car battery 10lbs!
 

sp6162 on here (mike O.) ordered a case of the 11ah ( he is building the same battery to start a v8 dragster) he lives in canada . i could combine canadian orders and save a lot on shipping for you guys .

Re: Building lightweight Lithium car battery 10lbs!
 

built 3 different versions . all thre have the same cells but differ in connection method .

the one on the left does the connections inside the box , close the lid and a very neat install. this one requires you to change your battery cable ends .

the center one with the connections on the sides , this version allows the top to be opened with cables connected , looks coll with the red and black knobs.

the right one is more of a conventional attachment , this is the version i'm putting in the boat for clearance . you can keep your existing ends on your cables and you can easily attach jumper cables to it to jump another car .

all three have been installed in my crossfire and fit easily.

https://cimg7.ibsrv.net/gimg/www.cro...13ac21aa57.jpg

https://cimg8.ibsrv.net/gimg/www.cro...ab619b8971.jpg

the one on the left has potting material pour into it . The wires are optional if a bms is desired .

Re: Building lightweight Lithium car battery 10lbs!
 

I don't know what current flows through the Crossfire starter motor, but I imagine it's a lot more than 100 Amperes. Have you measured the battery voltage when the starter s cranking? I don't see how the small diameter interconnection wires can handle the starter current; help me understand...

Re: Building lightweight Lithium car battery 10lbs!
 

Those wires don't carry any load they are for testing individual cell voltages . Inside of the pink heat shrink are the tabs that are spring clipped and screwed together . I had this attachment method tested at Enerdale labs for high current loads for 10 seconds , they showed no heat increase . We use the same connections on our electric car cells and they move hundreds of amps on a continuous load at 80 volts with no problems.

Re: Building lightweight Lithium car battery 10lbs!
 

Good, thank you!

Re: Building lightweight Lithium car battery 10lbs!
 

here are some pictures of them in the car .

https://cimg1.ibsrv.net/gimg/www.cro...2760980082.jpg

This is actually the correct version for the hidden cables , the potted one on the left above was a version my partner a retired electrical engineer did for the fun of it . There is no need to pot them together. This is clipped together but wires not added yet.

https://cimg4.ibsrv.net/gimg/www.cro...31afb8c155.jpg

on this install i use a safety cover over the positive terminal , they are mandated in boats.

https://cimg5.ibsrv.net/gimg/www.cro...6d3c366c06.jpg

the studs are protected by the caps.

Re: Building lightweight Lithium car battery 10lbs!
 

The hidden cable version installed.

https://cimg0.ibsrv.net/gimg/www.cro...25368fe2ee.jpg

Re: Building lightweight Lithium car battery 10lbs!
 

I think my battery is dying. My spoiler is lifting up now and then when the car sits for a couple days after I start it up. How much? I live in Canada. I am worried about safety XD.

Re: Building lightweight Lithium car battery 10lbs!
 

Alex , we sold out of them , 30,000 cells ! The high end audio guys and one of the Lithium battery manufactures bought pallets . They have been great in my cars and boat . A few people on here got some . One of the guys had a big stereo system in his xf and the lights would dim when he turned it up . He put in 11ah of these and his light quit dimming . I just ordered some cells from China to test out . They are the same chemistry but the tube format with threaded ends , so very easy to assemble . Will put them on my test bench and beat on them for a while to see how they do . If interested will update here .

mike

Re: Building lightweight Lithium car battery 10lbs!
 

oh :(. Thanks. I guess my battery will die before I can get one of these.

Re: Building lightweight Lithium car battery 10lbs!
 

One thing i did learn . The battery i originally built is 22ah . It appears the XF has a pretty decent power drain when not in use . After 2 weeks the battery is getting low . I'm probably going to increase it to 33ah for additional capacity . Fyi the last 22ah i built showed 1100 cca . So that would make the 33ah somewhere above 1500cca .

Re: Building lightweight Lithium car battery 10lbs!
 

King Happy is there anyway i can still build one of these? Some other source. I cant't believe i didnt pull the trigger when I had the chance. Where are you sourcing the upgrade from the 22 to the 33ah stuff.

Re: Building lightweight Lithium car battery 10lbs!
 

Scboost . I kept some cells for myself , so will using them for the capacity increase ( when i get to it ) .

I'm working on getting a palette of similar Lifepo4 lithium cells . 10ah pouches . This is the chemistry that is used in all of the Lithium batteries you can currently buy off the shelf for cars and boats . If I get them in i will let you know . Also Trojan just came out with a Lithium battery line called Trillium . Pretty nice battery but expensive .