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  1. M

    18650 Questions.

    Nearly all power hungry commercial electronic devices are either 2,3,4 or 5 cell li-ion and they only have simple 2 way DC jacks to charge them so how could this be the case? Are you talking about 18650 cells only?
  2. M

    18650 Questions.

    After much digging around I think I can answer most of my question but a few are still outstanding. 1. Yes. 2. Yes, butcutoffs differ between manufactures - some not even working. 3. Yes 4. Usuallly O-C 5. Use both as Vcutoff on flex is only for whole string. 6. Still not sure about this 7...
  3. M

    18650 Questions.

    I'm trying to understand how the protection systems work in an 18650 both in discharge and charge. I can't seem to find the answer here. 1. I presume unprotected cells are just 'raw' 3.7V li-ion batteries with no other circuitry? 2. Does a protected cell go open circuit if the voltage drops...
  4. M

    'Fuel Gauge' battery meter

    One more thing - the 5v regulator they use (7805) from cicra 1989 - could easily be replaced with a much smaller regulator, maybe even as small as 100mA as long as your LED brightness is low - mine is as I wanted miniumum battery drain. So you could use a 0.1A fixed posivide 5v regulator such...
  5. M

    'Fuel Gauge' battery meter

    15 google searches and 1 hour later I was still scrathcing my head trying to figure out where I got the circuit/article.......then bingo....I remembered a friend who was building a 12v based wind turbine set-up had an old journal: "home Power" from 1989 (april/may) I dug the article out and...
  6. M

    'Fuel Gauge' battery meter

    Piesoup, I made exactly what you are talking about - even the same amount of cells -12NiMH. It is absolute so you need no other voltage input refrence and you can adjust it to what ever voltage you like. I have just run out to my garage and can only find my veroboard layout diagram but not...

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