What Voltage Should a 9v Battery Read

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ix volt alkali metal battery

Discussion in 'Electronic Nuts' started by fashazee, Feb six, 2006.

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Whorl to continue with content

1. Hello,

   Technically speaking, at what voltage is a loaded nine 5 alkaline battery
   considered dead?

   Thanks in advance,

   Mike

2. ===================
   6.6V? (one.1V/prison cell x 6 cells)

3. Hi, Mike. When consumer batteries are rated for A-h (amp-hours), they
   are typically given a abiding load, and are considered expressionless when the
   output voltage reaches 60% of specified voltage (in the case of a 9V
   transistor battery, that would be v.4V)

   Of form, whatever battery is _really_ expressionless by the fourth dimension it reaches sixty% of
   rated voltage. I'd consider a 9V battery with a 25mA load very dead by
   the time it got to 7V or then. In one case the output voltage slides beneath lxxx%
   of nominal, it'due south got one foot in the grave.

   Skilful luck
   Chris

4. "fashazee"
   
   ** When whatever it is powering ceases to function properly.

   ........ Phil

5. I but got a look at: http://data.analeptic.com/PDFs/522.pdf

   Looks to me in that location is a bit of a "knee" in the discharge curve with the
   "center of the knee" at seven to vii.2 volts (1.1667-one.2 volts per cell), but
   the "knee" only stands out a footling. With intermittent duty and a
   constant resistance load, the time to 5V is near l% longer than the time
   to 7V.
   The constant current discharge curves testify mAH most or slightly more than
   than vii/half dozen every bit great when discharged to 4.eight volts equally at discharge to 6 volts.

   Meanwhile, every bit for what voltage to design something to work at with this
   battery? Since the datasheet has constant resistance and constant electric current
   hours-to-specified voltage curves (as a function of resistance or current)
   but for 6 and four.8 volts, I would blueprint something using this battery to
   keep working at least until the voltage decreases to 6 volts.
   Although I think information technology's OK for a product using this battery to piece of work simply
   not quite meet its specifications beneath seven.2 volts, I believe that a
   product designed to utilize this bombardment should work reasonably at least down
   to 6 volts.

   Meanwhile, in general pattern of products using alkali metal batteries: I
   believe they demand to work well with NiCd and NiMH that are typically 1.2
   volts per prison cell, and considered discharged at 1.1 volts per jail cell *or less*.
   So I believe a production needs to work well at ane.1 volts per cell.

   - Don Klipstein ()

6. "Don Klipstein" :

   ( snip agreed stuff)

   
   ** In that location is no need to assume that a Ni-Cd or NiMH battery ( made to
   supplant the 9 volt single use size) volition have only half-dozen cells - 7 cell
   examples of both have been available for a long fourth dimension and more recently 8
   jail cell ones too. These have nominal eight.4 and ix.6 volt ratings as opposed to
   vii.2 for the quondam vi jail cell ones.

   Also, where an item uses a 9 volt single use battery and no mention is made
   in the handbook of suitability of utilise with rechargeables, owners are non
   wise to presume it is safe to exercise and so.

   A NiCd jail cell ( and many NiMH too at present) can deliver a dangerously large current
   if shorted or reverse connected and the item concerned must be designed to
   cope with this without damage if the use of rechargeables is allowed.

   ........ Phil

7. Analeptic specify the capcity of their 9V alkaline metal to a discharge
   voltage of 4.8V
   This makes sense as alkali metal batteries are typically physically
   synthetic of six "AAAA" batteries in series, and single AAA/AA/C/D
   cells are specs to exist "dead" at 0.8V. So 0.8V 10 6 = 4.8V
   So in theory, to use all the bachelor capacity of a 9V battery, a
   device should be designed to operate down to 4.8V. Not many devices are
   though, they will die at a much higher voltage and hence won't utilize all
   the capacity of the battery.

   Dave

9. When it won't operate the thing it's powering any more.

   Cheers!
   Rich

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Source: https://www.electronicspoint.com/forums/threads/9-volt-alkaline-battery.9028/

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