Battery chemistries and the electronics in the battery management have all improved over the years, but in general some simple habits seem to help (or at least not do any harm)
- as you say in "daily" use, charging beyond 80% is not really worth it - especially if you've got a charger at home and you know you can get back safely. What does do harm is charging to 100% every night and keeping it at 100%.
- again in "daily" use probably best to avoid deep discharging - 20% is being cautious and gentle, but certainly below 10% regularly is probably best to avoid - at that SoC you will start to notice a drop off in performance anyway (as less instantaneous power available from the battery) and the car will doubtless start to nag you about needing to charge soon anyway!
- it is suggested that charging to 100% every now and then is a good idea so that the BMS knows what a full charge still looks like. But as above, what isn't a good idea is charging to 100% and then leaving it there for extended periods.
- there is a growing pool of data out there that suggests regular rapid charging has no increased impact on rate of degradation. If you're on a "long journey" and need to get some juice back - do the rapid charge, have a coffee, take a break and don't worry about it.
On "long trips" if you know you have a charging stop within range, again there's nothing wrong with running the charge lower than 20 or even 10%. Then it depends upon your "charger anxiety" levels really as to how comfortable you are knowing you're eeking out the last few miles or not. I have had my Tesla show 1% SoC on arrival at a Supercharger once or twice, but then I was happy that when I got there, there would be plenty of spare chargers and they would work. (the worst thing woudl be to arrive at a site with 1% left and find busted chargers and you then have to go drive somewhere else, that's when "charger anxiety" kicks in)
- use mapping tools (like Zapmap or A Better Route Planner) to plan your route and search out a range of chargers, just to be sure if nothing else that you've got the right charging App/Card.
- what is true is that all batteries will degrade over time. But doing the above will keep them in good health as far as you being careful is concerned.
- the granny charger with your car should allow you to adjust the Amps - I limit mine to 10A, or 9A if I'm being paranoid about the wiring I'm plugging into) - if you plug into an extension cable, just make sure that it's fully unwound and that you're happy the plugs are ok.
Beau wrote: ↑Sat Jan 13, 2024 10:12 am
Hope we have made good choices as this was a very large amount of money for us and vast more than we have ever spent in the past on a car.
Any tips on how to be kind to the batteries would be appreciated. In my research to this point, it seems best to avoid fast charges when possible and generally run between 20%-80% charge state but once a month top it up to 100%.
Another one for you all.
We are off for a break in the far west of Cornwall with almost no charging network other than a regularly broken one in a very expensive car park at Lands End. How long a cable can you use on a granny charger? Not checked yet but the manual implies I can adjust the amps so as not to overload things but read a few horror stories of people melting extension leads or blowing the electrics in the house.