Li-Ion Battery

	How to Prolong Lithium-based Batteries
refer to the article : How to prolong lithium-based batteries

Depth of

discharge

Discharge

cycles

1. Cycle life as a function of depth of discharge
A partial discharge reduces stress and prolongs battery life.

100% DoD

50% DoD

25% DoD

10% DoD

300 – 500

1,200 – 1,500

2,000 – 2,500

3,750 – 4,700

Storage Temperature °C	40% charge	100% charge	2. Estimated recoverable capacity when storing Li-ion for one year at various temperatures Elevated temperature hastens capacity loss. The capacity cannot be restored. Not all Li-ion systems behave the same.
0	98%	94%
25	96%	80%
40	85%	65%
60	75%	60% after 3 month

Simple Guidelines for Storing Batteries

Primary batteries store well. Alkaline and primary lithium batteries can be stored for 10 years with moderate loss capacity.
Remove battery from the equipment and store in a dry and cool place.
Avoid freezing. Batteries freeze more easily if in discharged state.
Lithium-ion must be stored in a charged state, ideally 40 percent. This assures that the battery will not drop below 2.50V/cell with self-discharge and fall asleep.
Discard Li-ion if the voltage has stayed below 2.00/V/cell for more than a week.

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