1. Lithium ion shelf life.
Method:
Just record the battery voltage each day for 3 years, using a multimeter.
Result:
Lithium-ion battery (9 V) shelf life in 3 years:
2. Lithium-ion charging characteristics.
Method:
Charging lithium-ion battery with a constant voltage and a constant current, record the voltage and curent in every 5 minutes.
Battery:
Nikon EN-EL3a battery (7.4 V, 1500 mAh):
Why do I choose 8.4 V and 0.6 A?
Because the charger from Nikon MH-18 specified 8.4 V and 0.9A:
So I charged the battery with 8.4 V and 0.6 A (less than 0.9 A is ok, it will take longer time):
The result:
Lithium-ion battery (7.4 V) charging chart, charging with constant 8.4 V and constant 0.6 A:
Charged another lithium-ion battery (7.2 V, 1010 mAh) with constant 8.4 V and constant 0.4 A), not recorded every 5 minutes:
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