Recent content by Mr Happy

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  1. Mr Happy

    Appropriate Charge Rate for NiMH Batteries

    Re: Appropriate (dis)Charge Rate for NiMH Batteries One other thing about this is that some chargers heat up the batteries from the outside. The charger electronics get hot and this heat is transmitted to the battery, making it hotter than otherwise. This is why some people might say you can...
  2. Mr Happy

    Using old and new eneloops together?

    :) The first time you do it the damage caused will be small and survivable. But such damage is cumulative. If you do it over and over you will certainly cause the weaker cell to fail prematurely.
  3. Mr Happy

    Using old and new eneloops together?

    Yes indeed, of course, for sure, no doubt about it. The weakest battery will run out and stop contributing, so now the light will be running on four batteries instead of five. What's worse is that the dead battery will be getting in the way and stopping the other four from working effectively...
  4. Mr Happy

    Ni-MH charge efficency at low rate (0,1mA etc)

    The charge storage ability of NiMH seems to depend on two factors: the existing state of charge, and the rate of self-discharge. A good cell like an Eneloop that is less than 80% charged will store close to 100% of the charge supplied to it. The charging efficiency only drops off when the...
  5. Mr Happy

    AccuPower IQ-328 AA/AAA Charger -- Nice... and Smart!!

    Unfortunately the charging rate guidelines for AA or AAA NiMH cells are theoretical, applied without reference to which charger is doing the charging. If the cell is charged in free air with wires connected to its terminals it is quite different from the cell being inside a small charger next to...
  6. Mr Happy

    Powerex Maha C9000 charger "HIGH" reading while charging NiMh AA cell

    Perhaps someone recycled the cell because it is old and had reached the end of its working life? Ask yourself, why would someone throw away a good battery? Rechargeable batteries grow old and die, just like other things. The best way to get good results from an old battery is to recycle it and...
  7. Mr Happy

    Powerex Maha C9000 charger "HIGH" reading while charging NiMh AA cell

    Yes, I definitely think the "recycle" logo is for the US market. I was more interested in the size designation of R6 rather than HR6. There are some Japanese market batteries here that have a different recycle logo, and also don't appear to have a visible ring shaped indentation around the top...
  8. Mr Happy

    Powerex Maha C9000 charger "HIGH" reading while charging NiMh AA cell

    Here is an older Eneloop (2006 vintage). It seems there have been small variations even in the genuine cells.
  9. Mr Happy

    AccuPower IQ-328 AA/AAA Charger -- Nice... and Smart!!

    I am uncertain whether these are "clones" as such. I think it more likely that there is a standard reference design out there from an original unbranded source and this design can be licensed by OEMs to produce and sell under their own brand. Given the wide range of products LaCrosse sells it is...
  10. Mr Happy

    Best kind of LR44/AG13 batteries, and where to buy

    Check out dollar stores. You can often get LR44's on a card at 3 or 4 for a dollar.
  11. Mr Happy

    Amps vs. Watts vs. Volts?

    I think you've missed something crucial there. You suggest maximum power output from a source will occur when the load resistance is zero. But then you go on to observe that when the load resistance is zero there will be no power in the load and all power is dissipated in the source. This is...
  12. Mr Happy

    maha powerex c9000 + eneloop AAA HR-4UTGB-4BP + AA HR-3UTGB-4BP

    Here is the calculation: (1925 - 1913) / 1913 = 0.00627 = 0.627% ~= 0.5%
  13. Mr Happy

    maha powerex c9000 + eneloop AAA HR-4UTGB-4BP + AA HR-3UTGB-4BP

    Nice results. Things to note: 1. The maximum difference between values is 1925 - 1913 = 12 mAh, or about 0.5%. This is an indication of consistency between cells (good manufacturing processes). 2. The cells have a minimum capacity of 1900 mAh, so your cells conform to their specification. 3...
  14. Mr Happy

    Do I have a problem with my MH C9000 or did I buy some "super cells!?"

    Also, when you run a break in on those cells, do not enter the capacity as 2400 mAh -- the cells are most likely not that good. Enter a break in capacity of 2000 mAh and see what the results are. Also remember the rule of thumb for using the C9000: charge AA cells at 1000 mA and AAA cells at...
  15. Mr Happy

    Maha MH-C9000 SUPPORT / FAQ - continuation

    The C9000 has a maximum charge current of 2000 mA and a maximum discharge current of 1000 mA.
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