Test/review of Ansmann AA 2850mAh (Silver)

Batteries and Chargers Rechargeable Batteries
1

Ansmann AA 2850mAh (Silver)







Official specifications:

  • Nominal voltage: 1.2V

  • Nominal capacity: 2850mAh

  • Minimum capacity: 2650mAh at 0.2C

  • Minimum capacity: 2450mAh at 1C

  • Max. continuous discharge current: 5000mA

  • Standard charge: 285mA

  • Quick charge: 800mA

  • Fast charge: 2850mA

  • Recommended charge termination: 0…5mV, 0.8…1°C/minute, 45…50°C

  • Continuous overcharge current: <200mA no conspicuous deformation, no leakage

  • Internal impedance: <30mOhm at 1kHz for fully charged battery

  • Cycle life: >500 according to IEC standard

  • Self discharge: >60% after 28 days at 20°C

  • Made in China




Maximum temperature raise at different discharge currents: 1A:+1,2°C, 2A:+3,8°C, 3A:+6,4°C, 5A:+12,7°C, 7A:+19,0°C, 10A:+24,5°C
High capacity AA batteries from Ansmann.











The discharge curves are normal for AA cells, the capacity is very high.















Conclusion

These cells are high capacity AA cells, but the price to pay for that is fast self discharge (How fast is rated in the data sheet\*).


Notes and links

\*Ansmann has real data sheets for their NiMH batteries.

How is the test done and how to read the charts
Compare to other AA/AAA batteries: Alkaline/NiMH/Lithium
2

At first glance I thought these might be good in a photographic application (high powered flash).
But when I checked the power curves i noticed they won’t maintain voltage as high as other brands. That means longer flash recycle times. Combine that with the fact that these aren’t LED and it’s not really suitable.

Thank you for doing the tests!!.

3

I have some of these that were used for powering an underwater photo strobe. They’ve deteriorated pretty rapidly, with the internal resistance going WAY up and capacity down. They don’t have enough performance to work in the strobe at all anymore and are only good for low draw applications. Self discharge is high.

You are better off with stock LSD Eneloops or the high cap version of similar cells. In a short time the Ansmann will be working far more poorly than a stock Eneloop.