http://www.moderntiredealer.com/article/722503/prepare-now-for-start-stop-systems
some excerpts:
Quote:
Johnson Controls predicts start-stop systems will find their way into more than 40% of new vehicles sold in the U.S. and will number over 40 million registered vehicles by 2020. Automakers will continue to make refinements to the systems to improve the consumer experience. Says Gospodarek, “In the coming years, you will begin to see a few new vehicles with dual batteries for more energy availability to power electrical accessories as well as power new autonomous driving features in the vehicles, such as autonomous emergency braking, self-steering and auto-park. These dual battery setups will be either AGM+AGM or AGM+Li-ion.”
Shops need battery testing equipment optimized for start-stop absorbent glass mat (AGM) and enhanced flooded batteries (EFB) and appropriate charging equipment.
Munsell [battery product specialist for General Motor Corp.’s ACDelco brand] says that for vehicles manufactured by General Motors, “we neither recommend, nor endorse replacing an AGM battery with an EFB battery. An EFB battery will have a different charge profile than an AGM battery, which will lead to premature failure of the battery.”
Munsell says AGM batteries require special care when charged offline. “This special care is to make sure that the charger has an AGM switch that will supply lower voltage to the battery during the charging process. This lower voltage is required due to the charge receptivity of AGM batteries. The maximum charging voltage for an AGM battery at 80 degrees Fahrenheit is between 14.4 volts and 14.6 volts. If the ambient temperature is higher than that, charging voltage goes down,” says Munsell.
some excerpts:
Quote:
Johnson Controls predicts start-stop systems will find their way into more than 40% of new vehicles sold in the U.S. and will number over 40 million registered vehicles by 2020. Automakers will continue to make refinements to the systems to improve the consumer experience. Says Gospodarek, “In the coming years, you will begin to see a few new vehicles with dual batteries for more energy availability to power electrical accessories as well as power new autonomous driving features in the vehicles, such as autonomous emergency braking, self-steering and auto-park. These dual battery setups will be either AGM+AGM or AGM+Li-ion.”
Shops need battery testing equipment optimized for start-stop absorbent glass mat (AGM) and enhanced flooded batteries (EFB) and appropriate charging equipment.
Munsell [battery product specialist for General Motor Corp.’s ACDelco brand] says that for vehicles manufactured by General Motors, “we neither recommend, nor endorse replacing an AGM battery with an EFB battery. An EFB battery will have a different charge profile than an AGM battery, which will lead to premature failure of the battery.”
Munsell says AGM batteries require special care when charged offline. “This special care is to make sure that the charger has an AGM switch that will supply lower voltage to the battery during the charging process. This lower voltage is required due to the charge receptivity of AGM batteries. The maximum charging voltage for an AGM battery at 80 degrees Fahrenheit is between 14.4 volts and 14.6 volts. If the ambient temperature is higher than that, charging voltage goes down,” says Munsell.