12/31/2023 0 Comments Agm batteries near meMy car has 36K miles and has over 3 year on it, we shall see how long it lasts. ![]() Now the car does not have an alternator, the HV battery pack, inverter, and FLA battery supply power to all the 12V accy, electric steering, electric brakes, fan, etc. Same when the car is only on EV mode, 12V battery voltage doesn't change more than 0.1V or so compared to when the gas engine is running. With AC and headlights on at a stop the FLA battery is at around 14V depending on temperature and the HV battery pack is discharging to charge the 12V battery. Yes, the hybrid has gone to a FLA battery, but based on what I have observed with my scan gauge, even when stopped the HV battery pack supplies current to the FLA battery just like an alternator would. There are FLA batteries that likely would last as long as an AGM in start stop applications, but again the cost is going to be as much or more than an AGM. Now it is possible to design a FLA for much deeper discharge and long life, but I suspect that rather than differentiate FLA by application mfg have left FLA design the same and designed the AGM for longer life with deeper discharges. For Generations car starting batteries were designed for very high cranking amps, but also very shallow discharge. ![]() The present generation of AGM batteries are designed to handle a higher number and deeper discharge than the current generation of FLA starting batteries. Many battery mfg will NOT warranty a FLA battery used in cars with start stop technology.
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