Quote:
Originally Posted by sugarwood
My 2019 AGM battery is dead.
Last 4 years, I have not driven the car much and it mostly sits on a tender
I put it on a trickle charger overnight and still dead.
I removed the battery from the car and hooked up a 12V charger
Once charged, I will take it to FLAPS and load test.
If fail, I will get a new 48 battery for $200 regular or $250 AGM
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AGM batteries reguire a higher charging voltage than a regular lead-acid battery.
Late vehicles' alternators (14V+) are designed for use with AGM batteries not early 911s.
Avoid using AGMs, if the vehicle isn't designed for its use!