Kiriakos did his own 9V battery capacity benchmarking tool, seven LED stages 2015

[Kiriakos GR]

 Kiriakos did his own 9V battery capacity benchmarking tool, seven LED stages and the first stage can adjust from 10 - 30mA and all stages together can offer adjustment from 10 mA up to 230mA.

LEDx2=30mA (four stages)
LEDx3=50mA  (three stages)
I will dare to say that this setup has an Accuracy / stability of +/- 1% which is good enough for my testing.
Many combinations are possible and fine adjust works in all  ( Made in Greece !! ) 
Alkaline load limit is specific, but I have also some 9V NiMH to play with, and verify their capacity too, this can handle higher load than 50mA. 

My new DC load is specifically made for 9V battery testing,  there is inside an KIA78R05 over a heat-sink which keeps the voltage and consumption stable until the battery to discharge down to 5.2V, this will be and the cut off voltage in my upcoming tests.

Its one LED stage have it own protection resistor / current limiter (film metal).
The first stage have additionally and a wire-wood pot at 500 Ohm, this makes possible fine adjust 10 - 30mA.

Basically this is a simple design which works very stable and nothing inside gets even warm.
I made the choice to use GDS-320 Oscilloscope at DMM mode, so it trend plot to record time until the cut off voltage.

Yes the box of my DIY DC load was previously an TV booster. 
This gadget for now removed my need for a programmable DC load, and this is good news for my wallet.
 

[Kiriakos GR]

ITTSB Battery benchmarking setup is now 100% ready for action. 

Final pictures ! 

[Kiriakos GR]

Supacell 9V digital / Milli-amp-Hours Capacity test results.


Intro,
According to international battery test standards an alkaline battery must be tested at 25C +/- 2.
ITTSB tested this cell at environmental temperature of 26C and the cell it self remained at 27C in all duration of this benchmark.

According to international battery test standards, the cut off voltage is set at 5.4V, ITTSB it did follow this guideline too.

According to international battery test standards there is no specific preset about the test load selection, but 40-50mA seems to be the most common selection for testing high drain 9V cells, additionally the lowest acceptable for such a cell is 25mA load.

Benchmark Result,
Supacell 9V digital regarding Milli-amp-Hours Capacity, this found to be at 550mAH nominal and definably this is great news as test result.

The benchmark was performed at Wednesday 24 June 2015 and it started at 13:00 and ended at 24:00 o’clock, test load was set to 50mA but in a meter with high display resolution to 50000 counts, the actual reading is 50mA plus of these 300 micro amperes.
Therefore the measured capacity is 550 ~ 553mAH as Nominal / Max, within 11 Hours.
   

Comments,
According to personal research such degree of high performance can be found only at similar battery products which using Zinc-Manganese Dioxide (Zn/MnO2) chemistry, and also are listed as high-performance or as industrial grade.
VARTA, GP battery, Energizer, are mainly the major competitors here.

According to ENERGIZER Milli-amp-Hours Capacity calculation method, their similar product, when this is tested at 50mA load, this has a capacity of also 550mAh, but when the load is set to 25mA, capacity can increase at 660mAH.
And I can suspect that such variations are expected, and that they can be charted down only if some one performs capacity testing in several test load conditions.

The quest of ITTSB Blog is simple quality verification, and the measurements’ shown that Supacell 9V Digital is a product which can easily compete and stay side by side next to other battery brands in the arena of  High-performing 9V 6LR61.
The description and marketing point of Supacell about 6X times longer lasting, is something which I can not verify.
Neither this marketing point stands in comparison to low-end 9V 6LR61 as those can have a capacity varying between 200 ~ 350mAH.
Either way, I am now happy with the results of my evaluation, if my expectation is to get a 550mAH 9V battery, now I will not hesitate to get a Supacell.

[Kiriakos GR]

Maxell Super Alkaline 9V  / Milli-amp-Hours Capacity test results.


Intro,
This battery did not looked that good from the start,  internal resistance and top voltage was at questionable levels.
I did contact Maxell Europe, and I received a promise that one of their engineers will contact me back, and this did not happen.
I am suspecting that their production in Hungary has issues.

Benchmark Result,
Under the same test conditions as above, this Maxell managed to do 10 hours plus 20 minutes.
This translates to 516mAH.

Comments,
The numbers speaks by the self's, if this is what Maxell Super Alkaline 9V can do? Then it seems as honest product but it does not deserve any praise.
Maxell Europe ignored even my request about receiving documentation about actual product specifications, therefore I am unable to even compare named capacity with the one which I did measure by my self.
In summary my communication with Maxell Europe it did not impresses me at all, and neither their Top class product.