I don't think 18650 cells will cut the mustard. They are Li-Ion which don't like to be discharged at a high rate. LiPo tolerate a higher discharge rate. There are similar pouch style LiPo on AliExpress at reasonable prices. I am building a replacement battery for my recently acquired 2015. I will use a manual contactor so that discharge is not dependent upon a bms. The BMS is highly important for charging. Drones discharge their LiPo at a very rapid rate with no BMS but use a BMS for charging. I will use a 30A Daly BMS that has a phone app to view and change settings. 30A is satisfactory because no current flows through the BMS on discharge which is differnt to the electric bicycle batteries that I have built.
Is that the temp sensor? I’m building a new battery for my EM these days, using 18650 cells. I also over discharged my original battery once, but was able to jumpstart it again and haven’t had any problems since.
There are 6 temp probes in between the cells. They have black and white wires running to them and plug into the BMS with the smaller of the two connectors (not the one i shorted out). Bike runs and charges fine with the BMS and contactor bypassed. I have found a few people that have over discharged these Lipo batteries and recovered them. I have also found a few people that have BMS / contactor problems
I shorted out 2 of the cell leads when checking voltage at the connector that plugs into the BMS , still have no idea why the contactor keeps tripping when charging but other people have had the same problem and replaced the BMS . I’d also like to build a new pack with a new BMS, I just bought a recording Watt meter i plan to connect soon and record real time demands of the bike so i can select the proper cells. I was leaning towards more LiPo to keep the build simple, Eldless-sphere.com can be a good resource
I don't think 18650 cells will cut the mustard. They are Li-Ion which don't like to be discharged at a high rate. LiPo tolerate a higher discharge rate. There are similar pouch style LiPo on AliExpress at reasonable prices. I am building a replacement battery for my recently acquired 2015. I will use a manual contactor so that discharge is not dependent upon a bms. The BMS is highly important for charging. Drones discharge their LiPo at a very rapid rate with no BMS but use a BMS for charging. I will use a 30A Daly BMS that has a phone app to view and change settings. 30A is satisfactory because no current flows through the BMS on discharge which is differnt to the electric bicycle batteries that I have built.
Is that the temp sensor?
I’m building a new battery for my EM these days, using 18650 cells.
I also over discharged my original battery once, but was able to jumpstart it again and haven’t had any problems since.
There are 6 temp probes in between the cells. They have black and white wires running to them and plug into the BMS with the smaller of the two connectors (not the one i shorted out). Bike runs and charges fine with the BMS and contactor bypassed. I have found a few people that have over discharged these Lipo batteries and recovered them. I have also found a few people that have BMS / contactor problems
Did you find out what you shorted out?
I shorted out 2 of the cell leads when checking voltage at the connector that plugs into the BMS , still have no idea why the contactor keeps tripping when charging but other people have had the same problem and replaced the BMS . I’d also like to build a new pack with a new BMS, I just bought a recording Watt meter i plan to connect soon and record real time demands of the bike so i can select the proper cells. I was leaning towards more LiPo to keep the build simple, Eldless-sphere.com can be a good resource