Test/review of Ansmann AA 2850mAh (Silver)

[SIZE=+3]Ansmann AA 2850mAh (Silver)[/SIZE]



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.















[SIZE=+3]Conclusion[/SIZE]

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*).


[SIZE=+3]Notes and links[/SIZE]

*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

Definitely a good capacity.
What surprised me is this sentence: "Self discharge (LSD): >60% after 28 days at 20°C"

Probably LSD should be changed to HSD 60% within 1 month is very fast.

ChibiM said:

Probably LSD should be changed to HSD 60% within 1 month is very fast.

Click to expand...

You are correct, I change the text but not the abbreviation, it is fixed now.

Ok, I thought it was an official specification

ChibiM said:

Ok, I thought it was an official specification

Click to expand...

The data sheet only says "Self discharge", I had added the LSD for the 2500mAh battery.

It's too bad that Ansmann products are very difficult to find in the US. I have an application that fits very well for the batteries that you tested. I know that the self drain is high but if you can manage that and take advantage of the high capacity it's a winner. I am also very interested in trying their NiZn batteries since my supply of Powergenix batteries is old a worn out. Ansmann and Pkcell seem to be the only ones left making NiZn batteries.
Thanks
Frank