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  1. Jackal21

    What makes these cheap Chinese chargers so dangerous?

    So, in conclusion, We have excluded from the danger list: - Storage, if the cells are in good condition (branded, no damage, same voltage, same age etc) - Overcharging, if we have an inteligent charger, displying the cells voltages and resistance, overall voltage, and if we are monitoring it...
  2. Jackal21

    What makes these cheap Chinese chargers so dangerous?

    I don't use a bms, only balance charging. "You can't exclude overcharging" If I know how much time the charging takes and I'm there and see on the charger screen when it reaches the 4.15v/cell that I've set, and I turn it off in case it doesn't by itself because the charger went bad, how can...
  3. Jackal21

    What makes these cheap Chinese chargers so dangerous?

    Thanks for the fast reply! I realy want to have an ideea of the risk scenarios that can take place in the apartment. 1. Storage/when is not in use or charged. I presume that a well treated, undamaged, out of branded cells pack, can't be dangerous while just standing at storage voltage, right...
  4. Jackal21

    What makes these cheap Chinese chargers so dangerous?

    One question for those that know electronics and how inteligent chargers work: During the ballancing charging process, what are the situations that a charger can cause a battery fire? What has to happen inside it to cause that? Let's say we are there to stop overcharging it if the charger fails...
  5. Jackal21

    Lithium battery fire risk and information.

    I've also used an amo box for my 3s 2200, 5000mA lipos.
  6. Jackal21

    Lithium battery fire risk and information.

    Where do you guys living in apartments charge your batteries? Or those living in houses that charge them into the house, except basement, garage or any other spaces that an apartment doesn’t have. But if you have made any safety boxes in the basement or garage, that can be used in an apartment...
  7. Jackal21

    Lithium battery fire risk and information.

    From the home protection point of view, let's take an appartment to narrow down our options, from this video presentation, the small electric scooter that went on fire while charging in the house is what stuck into my head the most because, although teriffying the explosions, the fires or that...
  8. Jackal21

    I had a lithium fire (my own fault)

    I thought lithium batteryes fire can't be stopped with water, is this untrue?
  9. Jackal21

    40kW paramotor project

    Thank you! The Mad M50 motor is considered to produce about 70kg thrust with the 140cm prop at 20kw, info found on the OpenPpg community forum. With my battery I can go to about 15kw, above that the voltage drop is to high. So I have maybe 50 kg thrust. All I know is that recently I had a flight...
  10. Jackal21

    Accurate continuous current rating for nickel strips

    Very curious about the answer as I've posted the exact same question and charts back in september. I was interested in the 0.15x10mm pure nickel strip that can handle 14-21 Amps acording to one chart and 6A to the other. I was towards the 6A. But now after mounting a thermometer probe inside...
  11. Jackal21

    Thoughts on Paramotor parts list

    A Hi, I've bought from them only the eppg frame, cnc arms and quick prop release bolt. As far as I know you can buy whatever you want from them. I've then bought the rest of the parts from the producers in Europe, builded my battery and throttle and I'm on my fifth flight and it's great! Did...
  12. Jackal21

    40kW paramotor project

    Hi, did you finish your paramotor? What motor, esc, battery did you use? I've just made my electric paramotor with the Mad M50 motor, Mad 300A esc and a li ion 32A 88v nominal 2.8kwh battery and I love it. Some details in the video of my first flight
  13. Jackal21

    Where to buy quality battery in EU?

    I've buyied from the well known company Nkon in Netherlands, from where I've heard many buy their batteries in Europe. Don't know about bms because I don't use them.
  14. Jackal21

    Help in identifying voltage drop/overheating reason

    Thank you very much for the answers! 🙏
  15. Jackal21

    Help in identifying voltage drop/overheating reason

    I've made the box from 1.5mm aluminium and bolts..lots of bolts. Made lightening holes and covered in carbon wrap to take away the garage build looking...
  16. Jackal21

    Help in identifying voltage drop/overheating reason

    I think that the problem might be the portions of the parallel nickel between the series connections and the cells. The high curent travels through the series connections which I have seven, only six at pack ends. Then to get to the cell, it gows through a few mm of 0.15x10mm nickel strip. If we...
  17. Jackal21

    Help in identifying voltage drop/overheating reason

    Well I saw 175A for seconds..devided to 8 is 21.8A on 35A rated cells. The Molicel 24s6p of the SP140 electric paramotor does 20kw because has the same motor as mine. At 88v that power means 227A from 6cells is 37.8A/cell. If I hadn't heard that Samsung are good cells would never consider them...
  18. Jackal21

    Help in identifying voltage drop/overheating reason

    -Don't know about the voltmeters because I already have many things on this battery that I can safely carry in flight. - I didn't have the knowing or devices to test one cell for resistance as the ISDTT8 charger shows impedance only for two or more cells. -The capacity test was done at small...
  19. Jackal21

    Help in identifying voltage drop/overheating reason

    At the begining of the ground test, with freshly charged battery 99v I went to full throttle. In three seconds the 8s voltage alarms set at 3.3v went on. The coulometer screen showed 17kw and 175A at 97v. I imediately stoped the motor. Reset the alarms at 2.9v and continued by simulating a...
  20. Jackal21

    Help in identifying voltage drop/overheating reason

    Hi, I've build an 2.8kw 24s8p battery (three 8s8p in series so I can charge them in parallel with hobby charger so no bms, for a paramotor project, using 21700 Samsung INR 40t3 4000mA, 35A, new cells from the well known company in NL. Tested four of them from 2.5 to 4.20v and got 4.050 -...
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