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We just got a Tesla model Y. When we picked it up, they told us to charge it up to 100% at least once per week. Is there something different about these batteri

by ra 3y ago

We just got a Tesla model Y. When we picked it up, they told us to charge it up to 100% at least once per week. Is there something different about these batteries?

speedgoose 3y ago
You probably have one with a LFP battery. They have a different chemistry that is cheaper, have a lower energy density, are less powerful, don’t like cold, but that can often be charged to 100%. The reason you need to charge it to 100% so often too is that it’s the voltage on a LFP battery is all over the place and the battery management system (BMS) has a hard time to keep track of the remaining capacity. Those system usually rely on the voltage but they can’t on this kind of battery. So charging to 100% will let the car know an accurate battery state of charge: full. I have a model y with a classic LG lithium battery and I almost never charge to 100% and the car is discouraging charging that high in its user interface. https://en.m.wikipedia.org/wiki/Lithium_iron_phosphate_battery https://en.m.wikipedia.org/wiki/Lithium_iron_phosphate_batte...
nortlov 3y ago
Some models (RWD?) are equipped with LFP (lithium iron phosphate) batteries. Tesla recommends setting a charge limit of 100% and, as you mentioned, charging up to 100% at least once per week. https://www.reddit.com/r/electricvehicles/comments/10ji8yk/lfp_vs_lithiumion_whats_the_difference_and_which/ https://www.reddit.com/r/electricvehicles/comments/10ji8yk/l...
- ra 3y ago
  Yes - ours is RWD.
eqvinox 3y ago
The percentage is irrelevant, what matters is the charge termination voltage, which AFAIK is lower on all electric cars because you care about battery longevity. I.e. if the same cells were in a laptop, your car showing 100% might only be 80% in the laptop, and it's all good. (What the actual charge termination voltage [and cell type] is, I sadly don't know and don't know where to find…)

by ra 3y ago

We just got a Tesla model Y. When we picked it up, they told us to charge it up to 100% at least once per week. Is there something different about these batteries?

speedgoose 3y ago

You probably have one with a LFP battery. They have a different chemistry that is cheaper, have a lower energy density, are less powerful, don’t like cold, but that can often be charged to 100%. The reason you need to charge it to 100% so often too is that it’s the voltage on a LFP battery is all over the place and the battery management system (BMS) has a hard time to keep track of the remaining capacity. Those system usually rely on the voltage but they can’t on this kind of battery. So charging to 100% will let the car know an accurate battery state of charge: full. I have a model y with a classic LG lithium battery and I almost never charge to 100% and the car is discouraging charging that high in its user interface. https://en.m.wikipedia.org/wiki/Lithium_iron_phosphate_battery https://en.m.wikipedia.org/wiki/Lithium_iron_phosphate_batte...

nortlov 3y ago

Some models (RWD?) are equipped with LFP (lithium iron phosphate) batteries. Tesla recommends setting a charge limit of 100% and, as you mentioned, charging up to 100% at least once per week. https://www.reddit.com/r/electricvehicles/comments/10ji8yk/lfp_vs_lithiumion_whats_the_difference_and_which/ https://www.reddit.com/r/electricvehicles/comments/10ji8yk/l...

ra 3y ago
Yes - ours is RWD.

eqvinox 3y ago

The percentage is irrelevant, what matters is the charge termination voltage, which AFAIK is lower on all electric cars because you care about battery longevity. I.e. if the same cells were in a laptop, your car showing 100% might only be 80% in the laptop, and it's all good. (What the actual charge termination voltage [and cell type] is, I sadly don't know and don't know where to find…)