Quote:
Originally Posted by Piwoslaw
When I invested in an AGM (roughly twice the price of comparable lead acid), suddenly the feature started working. Though now, when the battery is 3 years old, it hardly works during winter, even though I trickle charge once or twice per week.
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This sounds odd to me. I have (knocks wood) absolutely ancient AGM batteries in two cars and they are still going strong. Granted they are not doing stop/start. But one of them is in a car that is notorious for getting wonky when the battery is in poor condition, and that car is quite well behaved. I have a CTEK charger that has a "battery refresh" feature, and I have run both batteries though that quite lengthy process. My understanding is that AGM batteries are much more amenable to that type of process, compared to lead/acid.