Load testing (CCA) is for starter batteries in ICE cars. Doesn't tell you much for an EV. What the Tesla cares about is capacity; How long can it keep the computer idling before it goes dead, so it runs a CAPACITY test, not a load test. Once the capacity gets too low, the battery can't make it long before the car has to wake up and recharge it using power from your HV battery. This means you lose miles, as there is a lot of overhead needed to do this.
Most of these auto parts store batteries are garbage now. They recycle the lead but don't process it well, and the plates crumble pretty fast. The resulting high surface area is good for high cranking amps, but the capacity falls to shit. The "certificates" are how the car secures all data to/from the Tesla mothership. If they expire, you lose all connectivity features and all updates. If you want that now, just unplug the LTE antennas from the ICE (Car Computer) under the glove box. However, once you lose the 2 year max certificates, there is no going back without paying thousands of dollars to Tesla. This will hurt your chances of selling the car in the future. The Tesla app will no longer function, and you will never be able to reset your phone-as-key if you replace your phone. You sill be stuck using the card or an (optional) fob. You can however refuse most updates simply by not connecting the car to wifi, it will only download updates on LTE (Tesla's dime) if they are critical security fixes. All newer Teslas have finally ditched the lead-acid and use a small ternary lithium battery made by CATL. They intended for it to last 10+ years, but some of the early ones have had teething issues. If the "replace 12v battery" alert comes back, I would try to order the high-quality $100 Atlas battery from Tesla. Luckily Tesla has realized the other EVs using the superchargers don't reach properly, so the newer design pedestals have longer cables. Sadly, Nobody has as painless of DCFC as Tesla, even if they are NACS capable now. Personally my next car will probably be a salvage Lucid Air, but I also don't do that much DCFC, so I can tolerate the extra hassle. On Mon, Dec 1, 2025 at 9:23 AM Mark Hanson <[email protected]> wrote: > Hi Phil, Cor etc, > > > > I followed your sequence of disconnecting the 12V battery & HV connector, > heard click on contactor, waited about 30 seconds & then reconnected HV > connector & hooked up the 12V battery. That got rid of the pesky > sky-is-falling replace 12V battery etc messages. Thanks a bunch! > > > > For reference I tested the (still good) 2021 battery that came out of the > car, resting 12.6V, load tested to 500A, 10sec with a 12V battery tester. > This is labeled Atlas BX/Hankook 1129182-00-B 12V 45AH > > > > Then before resetting the car_ I tested the new battery (installed July > 2025) from Advance Auto, 500A, 10sec, no sag **good**. Labeled: Die Hard > EV 410cca 41AH . > > > > I’m assuming the new software update that did the usual display twiddling, > better fart mode nonsense etc, had a error/glitch and now it’s good. Would > like to inhibit “updates” just seems to cause problems. > > > > One thing I noticed is that the USB drive no longer comes up with my > 5000/400 albums 43GB rock & smooth jazz songs. A minor thing but I wonder > why, tried removing & putting back but the little USB icon was gone. > > > > Say, I don’t quite understand the renew SSL “fetch new certificate” thing, > impossible to renew after 2 months. What is that? I’ve been driving EV’s > since the late 70’s (mostly conversions) and now factory EV’s but **never** > heard of that. We also have a 2020 Bolt and a 2013 Leaf that are more > “normal”. > > > > Speaking of normal (among the 43 EV’s now available), are there **any** > EV’s that have a seamless trip/fast charger mode like the Tesla? I got a > $250 CCS-NACS adapter for my Bolt & tested at a Tesla charger, was a PITA > and had to pay 51c per KWH (Tesla’s are 38c per KWH). Then tried the same > on a friend’s VW ID4 with his adapter, same PITA and charged more. You had > to go on PlugShare, pre-plan your trip for charging intervals, find the > addresses of all the fast chargers (CCS or Tesla), then with Tesla charging > stations - both the Bolt and the VW-ID4 that charged at a slow 50KW 1hour > rate had to **straddle** the short cord Tesla cables taking up **two** > spaces for an hour – much to the chagrin of nearby Tesla folks charging. > > > > A friend has a Chevy Equinox and another a MachE Mustang but looks like a > similar PITA for long trips, manual planning. That’s the **main** thing > I like about the Tesla, when I’m going to Orlando or Canada etc, just poke > in the destination address and Voila the trip & fast charger stops are > pre-figured out. Is Tesla the **only** one with this feature? Maybe > Rivian, but any regular manufacturers like Ford, GM, Toyota, Honda etc? > > > > > > Have a renewable energy day, > > > > Mark > > > > Mark E. Hanson > > 184 Vista Lane > > Fincastle, VA 24090 > > 540-473-1248 phone & FAX, 540-816-0812 cell > > REEVA: community service RE & EV project club > > Website: www.REEVAdiy.org (See Project Gallery) > > *UL* Certified PV Installer > > My RE&EV Circuits: www.EVDL.org/lib/mh > > REEVA Demo: http://youtu.be/4kqWn2H-rA0 > > Fincastle Solar Weather Station > <https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature> > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20251201/36a9c9f6/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
