Recent content by Milan

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  1. M

    Lithium rechargeables Cycles = full dead to charged or does a topup = a cycle?

    This can be found in official pdf files. Example from Panasonic CGR18650CF: 【Test condition】 Charge ：constant voltage/constant current, 4.2V, MAX.0.7It (1500mA) , 110mA cut-off Discharge ：constant current, 1.0It（2150mA）, 3.0V cut-off Charge / discharge rest time：20min. Temperature ：20℃
  2. M

    Fixing a Pb AGM battery with 1 bad cell

    Got an RBC7 type UPS battery on sale. It consists of two 12 volt 17Ah AGM batteries. One is ok, nearly new, but the other has one bad cell. It loses voltages of this bad cell and pops the cap when discharging (gassing when reverse charged). Also interesting behavior is that it's internal...
  3. M

    New site with a lot of AA/AAA, 9V and some lipo tests !

    Found it by accident. All tests are pretty new starting at late July 2013. http://rightbattery.com/ Nice primary and Ni-MH section. Definitely worth checking!
  4. M

    What is the lowest/highest tempeature that you've exposed NIMH batteries to?

    Alkalines are going to last longer and you don't have to worry about temperatures.
  5. M

    26650 Double Test: TrustFire Protected and King Kong ICR26650 from Wallbuys

    I don't like the voltage it arrived at. I don't like the capacity. I definitely don't like the internal resistance. Also I don't like the unmatched capacity. In spite of the fancy hologram it got confirmed that you never know what you get when ordering UF/TF batteries. Could be old, could be...
  6. M

    Less than 1 USD/led Q3 warm white on star, 24 pcs...

    http://www.ebay.com/itm/24pcs-Cree-XPE-Q3-LED-3-2-3-6V-Warm-White-for-Camping-Light-LED-Bulb-/180883528842?pt=Lamps_US&hash=item2a1d7f9c8a Any experience with these? What is the resistor for? thx
  7. M

    Disbalance Charger?

    yes it showed that BAL shortcut all the time
  8. M

    Disbalance Charger?

    Got my first hobby charger - fake IMAX B6 from ebay and tried charging 2S lipo which had 0.04V difference. 3.78 and 3.74 to start with. It kept this difference entire charging and dischargin. Stopped it sooner since I knew one cell was weaker and it rested 3.64 and 3.19 = this cell probably got...
  9. M

    Lithium 2450 button cell...how much current?

    Wow, complete discharge curve using just permille of battery capactity. I wonder how they do it in these flat LED keychains, shining for hours. But there are 2 cells in series so that might help.
  10. M

    Lithium 2450 button cell...how much current?

    I said "few" not "a few". As long as I know english, it should make a difference. And by saing that I assumed 2 hours max which you confimed (couple might fit better) and if Daravon is expecting intermittent use, I wouldn't see problem in it. Anyway, we are mainly talking about 2450 so let's...
  11. M

    Lithium 2450 button cell...how much current?

    Sure, np. I got up to half an amp from CR2016 when shorting through MM the other time so this wont be a challege for 2450. Even 2032 should power this for few hours if you need some budget solution.
  12. M

    Storing and longetivity of LiFePo4

    What is the ideal charge and temperature to store LIFEPO4? I mean I know that 40% and low temp rules for Li-Ion, but do these rules also apply to LFP? I know this chemistry is not very long with us, but that's just why I'd really appreciate some real world practial experience and not some...
  13. M

    GTL 18650 'click' of DEATH

    I bought some GTL 18650 few weeks ago after reading they are 1400mAh which confirmed they are not *TOTAL* crap and could be useful. For 2,4 USD a pair I wanted to try them. I was just photographing some greeny spider I discovered during a routine mosquito check before going to sleep when I...
  14. M

    When to change out batteries

    Well, these are not very scientific method, but I use them where measuring voltages won't tell you much, such as with Heavy Duty Ni-Cl/Zn... I use this old old old Light bulb connected to a wire and you can tell by how bright the bulb glows if it glows at all. Or I just switch to 10A scale...
  15. M

    2025 Battery poof!

    OMG, calling an poison assitance because of coin cell... ...paranoid. Next time, just eat it
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