The TLDR if you own a Lithium-powered EV, and want to keep the pack healthy, only charge to a high as you need. I typically only charge my Model 3 to 70% overnight for daily use. If I know I will need more for the day, I will set it to charge to the desired higher level right before I plan to leave so it spends less time at a higher level. A few times a year I do a long road trip, so I take it to 100% and let it sit plugged in for only about 30 minutes (to finish balancing) before I hit the road.
I also do this for my phone and laptop. Where most other people's devices start to show pretty severe degradation after a few years, my better still has no discernable loss of capacity. It's even worse for laptops as they charge to 100% then sit there getting really hot internally. Most laptops easily have a feature for limiting charge, but it's just now beginning to make it into phones. By the end of the year Android 15 is supposed to have an option to limit to 80% which will be welcome. On my phone, I currently use an add-on device called a "Chargie" that limits the charge to any level I set. My laptops made in the last 10 years have supported this natively. The manufacturers of these products, especially phones, WANT you to lose your battery capacity after a few years so you buy a new phone. This is also why it's super difficult to replace the battery, and they withhold easy and low cost replacements. Both my phone and laptop charge fast enough that I can top it off to 100% if needed while I am getting ready for a long trip or extended day, and I enjoy as-new battery life! On Tue, Oct 22, 2024 at 7:35 AM (-Phil-) <p...@ingineerix.com> wrote: > You didn't mention the chemistry, but all Lithium-Ion types prefer to > spend their time as close to 50% as possible, and as they spend more time > farther away from 50% (either very low or very high), the degradation rate > increases and is multiplied by high temperature. The difference between > 40-60% is hardly worth noting, but the difference from 90% to 100% is > massive. It's ok to occasionally take your pack low or high, but try to > minimize the time spent at either "end". In fact, I recommend charging to > 100% 3-4 times a year, but do it right before you are planning a longer > trip so the pack gets discharged right away. This helps the pack stay in > balance and keeps the BMS properly calibrated on most EVs. > > LFP also has this, but the degradation rate is much lower as compared to > ternary. > > Lead-Acid is the opposite, it wants to stay as close to 100% as possible, > and needs to complete a proper absorption phase to get it properly "full". > (Floating won't do it!) Anything below 100% is causing sulphation, and it > increases at high temps. > > You will notice all products with Lithium Ion are shipped around 50% to > ensure a long shelf life. This is exactly how you should store them if not > in use. Cooler is better, but avoid below freezing. > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20241022/f3a1cb57/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
