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Thread: Jumper leads or lithium jumper pack?

  1. #31
    Patrol Freak jff45's Avatar
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    Here’s a comparison shot of my 2 jump starters. The Noco is bigger and heavier with much better sized cables. They’re both rated at 2000 amps but it’s clear the Noco is the superior product.

    The Noco has the old micro USB charging port while the Topdon has USB-C.
    The Topdon does Qi phone/AirPods/etc wireless charging in addition to the USB outlets.

    I told my son they were on Amazon for $235 but when he looked it up they were back to $379..

    I’ve put the Topdon in my wife’s Kia Sorento and removed the jumper cables.

    6A8A4B8E-71CD-4B46-B9B4-B011976A67F0.jpeg
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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  4. #32
    Expert Brissieboy's Avatar
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    Reading the NOCO manual, it says to connect the positive lead first, then the negative (other way round for positive earth systems) and disconnect in the reverse sequence.
    I spent most of my working life in the electronics field and this does not make any logical sense to me. The usual practice it to always connect the ground connection first regardless of polarity. In any case, these units are totally insulated so it seems to me that it makes no difference which order the connections are made.
    Any idea why they might specify this particular sequence?

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  6. #33
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    Goes against what I always do as well. Maybe something to do with charge flowing from positive to negative?? But then you'd think you'd hook up negative first.
    ..

  7. #34
    Expert Brissieboy's Avatar
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    Quote Originally Posted by 10G View Post
    Goes against what I always do as well. Maybe something to do with charge flowing from positive to negative?? But then you'd think you'd hook up negative first.
    Nothing can flow until there is a circuit, and a circuit does not care which connection is first or last. The only thing that I can think of is for possible static discharge, but that seems extremely unlikely and would definitely best be done with the ground connection - and they always want the active/power side first?????
    The unit needs to be turned off when making the connection to the battery so it would have some electronics monitoring the leads for its connection validation. Maybe something there? But again, nothing can happen until there is circuit - it cannot sense anything with just a single connection.

  8. #35
    Patrol Freak jff45's Avatar
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    There are a few YT vids that show the safety features. It lights up if you have the wrong polarity. It’s pretty much idiot proof.

    I don’t know why they state the order of connection when there’s no harm done either way.
    John

    2001 GUII TI 4500 - Now converted to TD42T auto with Nomad valve body

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