Understanding Battery Specs?

Discussion in 'General Electronics Chat' started by hellohello123, Jun 13, 2016.

  1. hellohello123

    Thread Starter New Member

    Oct 11, 2015
    4
    0
    I've searched these definitions but still don't quite get it.
    What is meant by Standard Discharge Current and Maximum Discharge Current?

    I see a datasheet lists a rated capacity of 30mAh. But the standard discharge current is only 0.05mA and the max discharge current is only 0.5mA. Could I even draw 2amps from this battery?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Are those the self-discharge rates? Otherwise it's a smaller battery than I've ever heard of .
     
  3. hellohello123

    Thread Starter New Member

    Oct 11, 2015
    4
    0
    Sorry, I'm not sure what's meant by self-discharge rates. Here's the datasheet.
    http://www.farnell.com/datasheets/11289.pdf
    This is just an example. I've been looking at different datasheets, but not sure if I'm understanding what it all means.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Ok, that's a tiny battery and those are the normal in use current ratings. You cannot get anywhere near 2A from it. The max is what it says, when it's brand new.
     
  5. hellohello123

    Thread Starter New Member

    Oct 11, 2015
    4
    0
    OH .. I meant 2mA before lol. But guess I can't draw that much either.
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Agreed. Depending on what you're doing, you might use the cell to charge a capacitor and then get a burst of 2mA from both.
     
  7. Tonyr1084

    Active Member

    Sep 24, 2015
    532
    86
    Standard discharge rate means what the battery was designed to handle. 30mAh is the total amperage available over a period of time. Max discharge is what the battery can produce if it's dead shorted. In other words it can't push more than 0.5 mA.

    I'm no battery expert so I may be off base on this; If so - someone will quickly correct me, but since batteries are rated in (in this case) 30 mAh, theoretically you can draw 30 mA for one hour from this battery, OR 1 mA for 30 hours. Since they're rated in mAh, and this battery can't give more than 0.5 mA max, it might deliver 30 mA(h*2) or "Thirty milli-amps per TWO hours. Batteries are not typically rated in multiple hour periods, so it's a 30 mAh battery but can't push that hard.

    Did I mucky up the waters for you on this? I hope not.
     
  8. mishra87

    Member

    Jan 17, 2016
    166
    2
    1.Standard Discharge Current- For optimum performance of a battery and maximum battery life one should discharge the battery at "Standard Discharge Current" .

    2. Max. Cont. Discharge Current - One can not draw more current than defined "Max. Cont. Discharge Current" .
    The results- 1. Reduced battery life
    2. Reduced discharge time
    3. Abrupt behavior of battery

    Please find the attached datasheet for better understanding.

    Standard Discharge Current 1.0 mA
    Max. Cont. Discharge Current 2.5 mA- can not discharge the battery above 2.5mA.

    Since primary battery have very low discharge rate rather than secondary battery. I do not think primary battery can be discharged at 1C rate as stated in POST #7.


    Hope this helps !!!
     
    Last edited: Jun 14, 2016
  9. Techno Tronix

    Member

    Jan 10, 2015
    140
    10
    Battery self discharge rate varies based on the chemistry type used and the temperature the battery is at: higher temperatures increase the self-discharge rate.
     
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