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Home >> BMW >> 2016 >> M235i 2D Convertible, Automatic Trans >> Repair and Diagnosis >> General Information >> OEM General Information >> Functional Description - 2-Series (F22) - Charging System, Anti-Theft System, Body Electrical System, HVAC System >> Body Electrical System - Functional Description >> Lithium ion battery >> System functions >> Energy recovery

Energy recovery

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

AGM battery: 

Fig 1: Battery Energy Recovery Performance Curve
G09872777Courtesy 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
G09872778Courtesy 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.