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Home >> BMW >> 2019 >> X3 M40i >> Repair and Diagnosis >> External Pages >> Different car >> Section 576 (Functional Descriptions - F25 - Charging System, Anti-Theft, Body Electrical Systems) >> Charging System - Functional Description >> Lithium ion battery >> System functions >> Energy recovery

Energy recovery

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The following two graphics show an energy recovery performance comparison between an AGM battery and a lithium ion battery.

AGM battery: 

Fig 1: Lithium Ion Battery Charge Curve
G09909230Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Capacity in ampere-hours
2 Voltage in Volts
3 Current in amperes
4 Time in seconds
5 Curve for state of charge
6 Current curve
7 Voltage curve

Lithium ion battery: 

Fig 2: Lithium Ion Battery Voltage Curve
G09909231Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Battery capacity in ampere-hours
2 Battery voltage in volts
3 Current in amperes
4 Time in seconds
5 Curve for state of charge
6 Current curve
7 Voltage curve
NOTE: AGM battery:  The service life of an AGM battery is typically assumed to be 300 to 400 full cycles. That comes to a charge flow rate of approx. 36, 000 Ah.

Lithium ion battery:  With the chemicals used, up to 3000 full cycles are possible. This corresponds to a charge flow rate of approx. 210, 000 Ah.