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It’s been a while since I attended a talk about lithium ion batteries, but there were several issues in the chemistry(which I’m sure have changed in the last 20
by gpapilion 5y ago
It’s been a while since I attended a talk about lithium ion batteries, but there were several issues in the chemistry(which I’m sure have changed in the last 20 years).
One talk covered how you had an expected total number of cycles more than anything else. So you wanted to start between say 85% and draw down to 10% before charging.
- 6figurelenins 5y agoShallow (partial) cycles are better for longevity (measured as permanent capacity loss over time). The effect is "better than linear;" see Table 2. https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries https://batteryuniversity.com/article/bu-808-how-to-prolong-... In general, li-ion has the properties you want: no "memory," deep discharge OK, partial charge OK. The one it lacks is "shelf life:" they don't like long-term storage at full charge. So they ship at 3.7 volts instead of the "full" 4.2V state. (This is the old wisdom of not keeping your laptop on a charger.) Lawn tools, for example, might have a smart charger that draws them down after a month without use. I imagine it's upsetting to need your flashlight, vehicle, etc., and it's only at 50-70% capacity.