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  1. P

    Adding a parallel group to an existing pack (same cell model)

    I have a 4p14s pack that i would like to increase the capacity by adding another parallel group to it. The cells are all of the same manufacturer and model. The existing pack is fairly new only a couple months of use. If i make sure that the voltage of the cells on the assembled pack and the...
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    So i am guessing that the emmebrusa fork is not compatible with the caisanho version of the OSF. I have to flash both the motor and display with same versions ? Does anyone have images of what the display looks like with the mbrusa version ...
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    Do you have a link to the mrbusa forked firmaware and also any instructions on how to install it ? Is it the same as installing OSF instructions from eco-ebike.com ? Thanks.
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    Yes it is a new 2021 version. Does this also apply to the 860C ? And now that my screen wont turn on is it too late to do anything ? It is bricked you think ? Or is there a way to install the forked firmware ? Thanks.
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    I think I have bricked my 850c screen after attempting to flash the opensource firmware. I have a new motor with the 6 pin output from the motor for the screen. I have another motor which has the 8 pin with the harness that connects to an 850c screen with a 5 pin and i have updated the...
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    Feedback about folded battery layout for 14s12p pack

    So just reporting back after having tested and ridden the pack. Plugged it into an Electric Motion and went for a ride up and down a ski hill about 9 times. The amps, voltage drops and temperatures were monitored on the bluetooth bms. The pack hit the 120A continuous value a few times and the...
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    Feedback about folded battery layout for 14s12p pack

    Cool! Do you guys think this battery will hold up for 120 Amp pull ? Or you see any issues with it possibly burning to the ground ? It's going into an Electric Motion trials bike. Either way, for the first ride im going to ride it incrementally with more power. I have a smart BMS with...
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    Feedback about folded battery layout for 14s12p pack

    Who was LFP ?
  9. P

    Feedback about folded battery layout for 14s12p pack

    thanks! i would have prefered 25R for sure but got a good deal on these used 20R cells ... that is the sad truth :) the cells were already individual, i didnt have to grind the old connections off. If i would buy new cells to make this i would have chosen Samsung 40T, 10P14S would give 40Ah and...
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    Feedback about folded battery layout for 14s12p pack

    Here is the result. This is going to have a BMS that can allow up to 120 Amps... anyone see any issues with the pack ? Copper sandwhich of 0.15 copper and 0.15 nickel. Used 4 AWG copper buss for the cells that had many cells distance from the next cell in order to support high current. The...
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    Feedback about folded battery layout for 14s12p pack

    Hi, Im building a 14s12p pack that will be folded in half, basically built out of 2 block and connected at mid point. I've attached a pic of the best battery layout that i could think of. I tried to keep the series connections short. The pack will fold in the middle. Let me know if anyone...
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    Spot Welding Copper Strips to 18650 Battery Cells

    Ok so the copper finally arrived and it was worth the wait. I was able to successfully sandwhich the copper to the cell. Here are the details : copper = 0.15mm nickel = 0.2mm spot welder = malectrics spot welder setting = 26 ms pulse The welds are solid and i fell better havin the 0.15mm...
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    Spot Welding Copper Strips to 18650 Battery Cells

    Ok thanks for the details about using the 01.mm. I'm reading through the posts that you linked and it does look like devmonkey was doing the same thing i am doing :) deja vu indeed. I'll read through those posts and see what the outcome was. Thanks for this.
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    Spot Welding Copper Strips to 18650 Battery Cells

    I just tried the above, nickel plated steel with the 01.mm copper, and it works pretty well. You think that 0.1mm copper is enough for 30A ? I was looking at the ampacity chart i had found on a thread in this forum from Matador and it says that a 10mm by 0.1mm copper is good for 15 amps...
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    Spot Welding Copper Strips to 18650 Battery Cells

    Sure i'd be happy to do a test with 0.15mm copper. Ive ordered my copper from ali express so will take a month before i can get it and post results though. No worries for payapl, thanks for offer but i'm happy to contribute.
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    Spot Welding Copper Strips to 18650 Battery Cells

    It is a 2P14S pack using Samsung 40T cells which can put out 30A continuous. Im going to be using it with a controller that pulls 45 amps max on occasion but most of the time will be used with a TSDZ2 pulling about 12 amps.
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    Spot Welding Copper Strips to 18650 Battery Cells

    Yes you are right that there is no weld between the copper and nickel on the battery side and I agree with you that it is not 100% reliable. To help improve the contact, once the connections are made i would put some foam and a outside hardshell (ive used a flexible cutting board in the past)...
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    Spot Welding Copper Strips to 18650 Battery Cells

    I have some 0.1 copper sheet. I just tried an infinite slit with it and it welds much better than the 0.2mm copper. The problem is that the battery is putting out 60 amps continuous and so the 0.1mm copper is not enough as far as i know. I could order some 0.15mm and try with that but I would...
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    Spot Welding Copper Strips to 18650 Battery Cells

    From my understanding, current follows the path of least resistance. With this is mind, the copper is in contact with the nickel strip on the battery side as well as the nickel that is wrapped around. Therefore the current path would travel from the battery, then through 0.15 thickness of...
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    Spot Welding Copper Strips to 18650 Battery Cells

    it's 0.15 nickel and 0.2 copper. Why do you say this would not work in more than 2p build ?
  21. P

    Spot Welding Copper Strips to 18650 Battery Cells

    Here is an update as to how i decided to build with copper connections. I have a malectrics spot welder and with that it is possible to spot weld nickel to copper strips. Here are the welding combinations that are possible with the malectrics: - nickel to battery = yes - copper to battery =...
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    Spot Welding Copper Strips to 18650 Battery Cells

    Yes makes sense. This is what i was thinking would be the risk also... I just thought if it was taped together well enough that is shouldnt move but i guess the risk would always be present and its not something you want to be thinking about when flying through the woods. Shouldn't be worried...
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    Spot Welding Copper Strips to 18650 Battery Cells

    I have a question, which i myself think is not so bright, but what about just simply taping the copper connections in place. I mean simply wrapping Kapton tape around the entire battery, holding the connectors in place ? they shouldn't move after they are taped. I am currently building a 2P14S...
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    Is a little rust normal for nickel strip in salt water

    I tried verifying the resistance of the nickel strip vs the copper but my ohm meter is not precise enough, the smallest resistance measurement is at 200 ohm level.
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    Is a little rust normal for nickel strip in salt water

    spinningmagnets thanks for pointing me towards the nickel / copper sandwhich thread. I read through it and it looks like i might give this solution a try. I had actually ordered some copper from aliexpress and never got around to experimenting with it so now i have a reason. Is there any way...
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