Ansmann MaxE 9V 280mAh NiMH - Prank or a dimensions correction cut down version?

[Kiriakos GR]

I just got confirmation by Ansmann, my batch this is manufactured mid 2024    

[Kiriakos GR]

I can so far confirm by my own signature that the saying about dimensions correction cut down version, this is a myth. 

Ansmann 9V Typ280 this is a regular fat cow as is the MaxE 300mAh.
 
My very own MaxE 300mAh this was an gift of Ansmann UK to me 12 years ago (11-2013), I actually received two, this sample alone survived.
This has now over 20 Ohm of internal resistance at 1kHz.

Due this (semi positive) personal experience, I did decide to buy these Typ280.
It is recorded repeatedly and due several examples at my website, that Ansmann this failed to satisfy my expectations due their AA and AAA cells.
But the survival ability of this single MaxE 300mAh, this worked as personal proof and a motive for me, so to give my money again.

I have here my first results, regarding both Typ280 measured capacity, but nothing will be reported until I perform three test cycles.

I am acting here very carefully so to avoid the delivery of a false impression.

[Kiriakos GR]

All right, I came at the end of this testing process.
I did everything according to IEC official capacity measurements verification (Know-how).
Five cycles in total.

IEC informs that at this testing, the battery this might stretch or might lose capacity, but the actual goal this is the discovery of usable capacity.

Two batteries these they can not be 100% identical in capacity.
Ansmann datasheet this informs of a Min/Max capacity range at 0.5C discharge, anything between 270 ~ 300 mAh this is considered as a good manufactured product.

 
This entire testing process for these Ansmann Typ 280 9V PP3, this worked as a benchmark for these batteries, and also as a benchmark for my bright new computerized battery capacity tester.
This tester (two active slots) demonstrated an extreme level of measuring precision about energy calculation, and accurate timing down to the last second.

Now I have obtain significant amount of confidence, in favor of the batteries and in favor of my testing system. 
 
If I had to print my lab test report, the numbers bellow they would be in it.

DUT No1 Five cycles according to IEC
262 mAh / 2.21Wh
274 mAh / 2.36Wh
275 mAh / 2.37Wh
278 mAh / 2.40Wh   Gain +6%   (R 668 mOhm DC Mode)
274 mAh / 2.38Wh   (fifth Cycle)

DUT No2 Five cycles according to IEC
283 mAh / 2.39Wh
288 mAh / 2.48Wh
287 mAh / 2.47Wh
295 mAh / 2.55Wh   Gain +4%   (R 651 mOhm DC Mode)
289 mAh / 2.51Wh   (fifth Cycle)

Regarding battery internal resistance measurements.
All the testers these performing this measurement in DC mode, they deliver trust able measurements within a window of time of the entire testing process.
This time window starts approximately after the first hour of battery discharge and ends fifteen minutes before the battery reach the termination voltage.
I did confirm this detail, at about twenty testing cycles, with my system.
8.4V PP3 this is actually a battery pack of seven cells, near to termination voltage, all seven cells trying to recover their voltage back at 1.4V.
The tester pauses and trying to measure float voltage,  but they are too many sources these causing sudden voltage increase, and this phenomenon it does drive the tester at significant measured error.

At battery internal resistance measurements of a single AA or AAA cell, at the last minutes before voltage termination, these are somewhat more error free, in comparison of how it behaves an 8.4V PP3.

Personally because I hate measuring errors no matter of which factor this causing them, I am going to trust internal resistance measurements, when these are taken within the flat section of the entire discharge curve.
And I will disregard or ignore, these measurements at the first and last 40 minutes, of a testing process. 

[overvolt]

This is another one, of the very impressive myth busting reviews of ITTSB.EU 

 

[Kiriakos GR]

This is another one, of the very impressive myth busting reviews of ITTSB.EU 

To me it was a pack of proofs, that I did not get scammed 

Thanks mate !