FAQ - Frequently Asked Questions

What is the 4.25 Volt level for LFP cells?

It is the maximal charging level. When charging the voltage per cell must be limited to 4.25V and bellow. If the voltage exceeds 4.25V, the cell is getting internally damaged and the life span is shortened.

What is the 3.2 Volt level for LFP cells?

It is the nominal discharge voltage.  Please see the discharge voltage diagram. During the discharge the nominal voltage is 3.2V.

What is the 2.5 Volt level for LFP cells?

It is the minimal discharge voltage.  During discharge, the battery voltage must not drop bellow this level. When the voltage goes down to 2.5V the discharge must be stopped. If the voltage goes bellow 2.5V, the cell is getting internally damaged and the life span is shortened.

What is the life expectance for the LFP cells?

The shelf life for LFP cells is at least 10 years. However due to internal discharge (approx 3% a month), the batteries should be charged at least one a year when stored for a long period of time.  When taking proper care of the batteries the life span of the cells may be 30 years and more.

What is the life cycle expectancy of the LFP cells?
Please see the cycle expectancy diagram.  The cycle life is 5000 cycles at 80% capacity level, 8000 cycles at 70% capacity level. (The discharge rate is at 0.5 C.).  With performing one full cycle full every day day, the 8000 cycles mean nearly 22 years of use.