12v Battery Replacement

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Now you’re just speculating about trickle chargers after attempting to sound knowledgeable about other matters. At this point I can only surmise that you’re simply offering misinformed opinions.
You could just use Google? Look up lead acid desulfation, there are all sorts of odd charging schemes like pulse charging for lead acid. Try looking at a datash li ion charge controller, charging a battery isnt a generic process. This information really isn't hard to find (usually). If you want to figure out if there is any special lead acid maintenance functions you could try taking a look at patents, I don't know who makes the dc-dc but the usual suspects for this type of thing would be Panasonic, mitsubishi electric, and kehin(Hitachi, they are kinda the same thing now? I dunno the specifics about that). Just to make this clear, I really don't support putting li ion in place of lead acid car batteries, there really isn't a huge amount of practical benefit from what I can see.
 
Given that my original battery is now approaching 6 years old, I'm probably just going to buy the cheapest one, probably the Costco. It seems that I'm driving plenty often enough to keep it charged as I've never had it discharge due to inactivity. I also keep the car in a pretty temperature controlled area (either basement garage at my house or essentially a basement level of a parking deck at work). I expect good life from the replacement as well, given what I've experienced thus far. Keeping a jump pack in the trunk does seem to be a good idea for PHEVs since it is hard to sense 12V battery decline like you can in ICE cars (slow starting).

Just got back from my month and a half away (car left at the work parking lot since I live in the city) and came back to a dead battery as expected. Threw it on a trickle charger for a bit and it seems fine but given the fact that it's gone through COVID discharge and it's the original 2018 battery, decided to swap it out. Ended up getting the cheapest battery which was not the Costco but the Walmart value (~$70). Since I do no short trips in my car (every trip is at least an hour), I use it multiple times per week, and it's garaged or on a charger during the winter this seems like a reasonable risk, but I'll report back on whether it strands me.
 
Just to record this here, The EverStart value in our group size, at least the one I got, starts with an EP serial number (so supplied by East Penn) but was made in South Korea. Brand new off the truck, date sticker looks to be about a month or two old

If I remember I'll post in about a year to update everybody on how it's doing.

 
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Ended up getting the cheapest battery which was not the Costco but the Walmart value (~$70). Since I do no short trips in my car (every trip is at least an hour), I use it multiple times per week, and it's garaged or on a charger during the winter this seems like a reasonable risk, but I'll report back on whether it strands me.

I haven't yet replaced mine, but was considering this same battery. Last time I looked it was in stock at the local Walmart. I think there is a good chance that this is the most cost effective option for you. Posts online will say that this battery has a low life, but the Clarity isn't very hard on a battery, so I don't know that it will be the case in one of our cars...
 
Posts online will say that this battery has a low life, but the Clarity isn't very hard on a battery, so I don't know that it will be the case in one of our cars...

Our Clarity killed the battery twice while sitting around doing nothing. Other owners have reported the same. My anecdotal experience with conventional vehicles is that none of them have ever drained a battery while sitting idle for 6 weeks. More often than not, those batteries lasted 7-10 years, and some were replaced while they still had the ability to start a V-8.

Of course, a car with this gift will be able to drain an expensive, high quality battery with the same aplomb as it will a low cost battery of questionable quality. That said, the low cost option should perform adequately.
 
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