Conrad energy LiIon 9V 500mAh (Blue)



Official specifications:

• Chemistry: Lithium
• Rechargeable: Yes
• Voltage: 7.4V
• Rated Capacity: 500mAh
• Minimum Capacity: 450mAh
• Voltage at end of discharge: 6.0V
• Charging voltage: 8.4V
• Internal Impedance: <500mOhm at 1kHz
• Standard charge: CC/CV 8.4V 0.2C with 0.02C cut-off
• Fast charge: CC/CV 8.4V 0.5C with 0.02C cut-off
• Maximum continuous charge: 1C
• Standard discharge: 0.2C to 6.0V
• Fast discharge: 0.5C to 6.0V
• Maximum continuous discharge: 1C
• Operating temperature range: charge: 0°C ~ 45°C, discharge: -20°C ~ 60°C
• Storage temperature range: less than 3 months: -20°C ~ 40°C, less than 1 year: -20°C ~ 25°C
• Cycle life: 500 cycles to 70% using standard charge/discharge
• Size maximum: 48.5 x 26.5 x 17.5 mm

The German company Conrad have some 9V LiIon cell in their range of batteries, this is the high capacity version.
Overcharge protection on the A cell kicks in at 8,49 volt and over discharge protection at 5,67V
Overcharge protection on the B cell kicks in at 8,51 volt and over discharge protection at 5,56V












There is some difference in capacity between the two cells. Both cells handles load fine, even at 500mA, the capacity is also more than rated.











Conclusion


These batteries have more than double capacity compared to NiMH 9V batteries and are close to a alkaline battery at low load and this battery will maintain high capacity and voltage at high load.

In moderate to high load situations this looks like a good replacement for alkaline.



Notes and links

How is the test done and how to read the charts
Compare to other 9V batteries: Alkaline/NiMH/Lithium/other